ARROW-984: [GLib] Add Go examples#661

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ARROW-984: [GLib] Add Go examples #661

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5 changes: 5 additions & 0 deletions c_glib/.gitignore
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Expand Up@@ -41,3 +41,8 @@ Makefile.in
/example/build
/example/read-batch
/example/read-stream
!/example/go/Makefile
/example/go/read-batch
/example/go/read-stream
/example/go/write-batch
/example/go/write-stream
35 changes: 35 additions & 0 deletions c_glib/example/go/Makefile
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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. See accompanying LICENSE file.

PROGRAMS = \
read-batch \
read-stream \
write-batch \
write-stream

all: build

generate:
$$GOPATH/bin/gir-generator \
-o $$GOPATH/src/gir/arrow-1.0 \
-config arrow-1.0/config.json \
arrow-1.0/arrow.go.in

build: $(PROGRAMS)

clean:
rm -f $(PROGRAMS)

.SUFFIXES: .go

.go:
go build -o $@ $<
78 changes: 78 additions & 0 deletions c_glib/example/go/README.md
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<!---
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License. See accompanying LICENSE file.
-->

# Arrow Go example

There are Go example codes in this directory.

## How to run

All example codes use
[go-gir-generator](https://github.com/linuxdeepin/go-gir-generator) to
use Arrow GLib based bindings.

See [../../README.md](../../README.md) how to install Arrow GLib. You
can use packages to install Arrow GLib. The following instructions
assumes that you've installed Arrow GLib by package. Package name is
`libarrow-glib-dev` on Debian GNU/Linux and Ubuntu, `arrow-glib-devel`
on CentOS.

Here are command lines to install go-gir-generator on Debian GNU/Linux
and Ubuntu:

```text
% sudo apt install -V -y libarrow-glib-dev golang git libgirepository1.0-dev libgudev-1.0-dev
% export GOPATH=$HOME
% go get github.com/linuxdeepin/go-gir-generator
% cd $GOPATH/src/github.com/linuxdeepin/go-gir-generator
% make build copyfile
% mkdir -p $GOPATH/bin/
% cp -a out/gir-generator $GOPATH/bin/
% cp -a out/src/gir/ $GOPATH/src/
```

Now, you can generate Arrow bindings for Go:

```text
% git clone https://github.com/apache/arrow.git ~/arrow
% cd ~/arrow/c_glib/example/go
% make generate
```

Then you can build all example codes:

```text
% cd ~/arrow/c_glib/example/go
% make
% ./write-batch # Write data in batch mode
% ./read-batch # Read the written batch mode data
% ./write-stream # Write data in stream mode
% ./read-stream # Read the written stream mode data
```

## Go example codes

Here are example codes in this directory:

* `write-batch.go`: It shows how to write Arrow array to file in
batch mode.

* `read-batch.go`: It shows how to read Arrow array from file in
batch mode.

* `write-stream.go`: It shows how to write Arrow array to file in
stream mode.

* `read-stream.go`: It shows how to read Arrow array from file in
stream mode.
38 changes: 38 additions & 0 deletions c_glib/example/go/arrow-1.0/arrow.go.in
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package arrow

/*
#include "arrow.gen.h"
#cgo pkg-config: arrow-glib

[<.g_list_funcs>]
[<.g_error_free>]
[<.g_free>]
*/
import "C"
import "unsafe"

import (
"gir/glib-2.0"
"gir/gobject-2.0"
)

[<.go_utils>]

[<.go_bindings>]
21 changes: 21 additions & 0 deletions c_glib/example/go/arrow-1.0/config.json
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

{
"namespace": "Arrow",
"version": "1.0"
}
100 changes: 100 additions & 0 deletions c_glib/example/go/read-batch.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
"os"
"log"
"fmt"
"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
valueType := column.GetValueType()
switch valueType {
case arrow.TypeUint8:
fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
case arrow.TypeUint16:
fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
case arrow.TypeUint32:
fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
case arrow.TypeUint64:
fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
case arrow.TypeInt8:
fmt.Print(arrow.ToInt8Array(column).GetValue(i))
case arrow.TypeInt16:
fmt.Print(arrow.ToInt16Array(column).GetValue(i))
case arrow.TypeInt32:
fmt.Print(arrow.ToInt32Array(column).GetValue(i))
case arrow.TypeInt64:
fmt.Print(arrow.ToInt64Array(column).GetValue(i))
case arrow.TypeFloat:
fmt.Print(arrow.ToFloatArray(column).GetValue(i))
case arrow.TypeDouble:
fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
default:
fmt.Printf("unknown(%s)", valueType)
}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
nColumns := recordBatch.GetNColumns()
for i := uint32(0); i < nColumns; i++ {
column := recordBatch.GetColumn(i)
columnName := recordBatch.GetColumnName(i)
fmt.Printf(" %s: [", columnName)
nRows := recordBatch.GetNRows()
for j := int64(0); j < nRows; j++ {
if j > 0 {
fmt.Print(", ")
}
PrintColumnValue(column, j)
}
fmt.Println("]")
}
}

func main() {
var path string
if len(os.Args) < 2 {
path = "/tmp/batch.arrow"
} else {
path = os.Args[1]
}
input, err := arrow.NewMemoryMappedInputStream(path);
if err != nil {
log.Fatalf("Failed to open path: <%s>: %v", path, err)
}
reader, err := arrow.NewFileReader(input)
if err != nil {
log.Fatalf("Failed to parse data: %v", err)
}
var i uint32
nRecordBatches := reader.GetNRecordBatches()
for i = 0; i < nRecordBatches; i++ {
recordBatch, err := reader.GetRecordBatch(i)
if err != nil {
log.Fatalf("Failed to get record batch[%d]: %v", i, err)
}
fmt.Println(strings.Repeat("=", 40))
fmt.Printf("record-batch[%d]:\n", i)
PrintRecordBatch(recordBatch)
}
}
101 changes: 101 additions & 0 deletions c_glib/example/go/read-stream.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
"os"
"log"
"fmt"
"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
valueType := column.GetValueType()
switch valueType {
case arrow.TypeUint8:
fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
case arrow.TypeUint16:
fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
case arrow.TypeUint32:
fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
case arrow.TypeUint64:
fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
case arrow.TypeInt8:
fmt.Print(arrow.ToInt8Array(column).GetValue(i))
case arrow.TypeInt16:
fmt.Print(arrow.ToInt16Array(column).GetValue(i))
case arrow.TypeInt32:
fmt.Print(arrow.ToInt32Array(column).GetValue(i))
case arrow.TypeInt64:
fmt.Print(arrow.ToInt64Array(column).GetValue(i))
case arrow.TypeFloat:
fmt.Print(arrow.ToFloatArray(column).GetValue(i))
case arrow.TypeDouble:
fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
default:
fmt.Printf("unknown(%s)", valueType)
}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
nColumns := recordBatch.GetNColumns()
for i := uint32(0); i < nColumns; i++ {
column := recordBatch.GetColumn(i)
columnName := recordBatch.GetColumnName(i)
fmt.Printf(" %s: [", columnName)
nRows := recordBatch.GetNRows()
for j := int64(0); j < nRows; j++ {
if j > 0 {
fmt.Print(", ")
}
PrintColumnValue(column, j)
}
fmt.Println("]")
}
}

func main() {
var path string
if len(os.Args) < 2 {
path = "/tmp/stream.arrow"
} else {
path = os.Args[1]
}
input, err := arrow.NewMemoryMappedInputStream(path);
if err != nil {
log.Fatalf("Failed to open path: <%s>: %v", path, err)
}
reader, err := arrow.NewStreamReader(input)
if err != nil {
log.Fatalf("Failed to parse data: %v", err)
}
for i := 0; true; i++ {
recordBatch, err := reader.GetNextRecordBatch()
if err != nil {
log.Fatalf("Failed to get next record batch: %v", err)
}
if recordBatch == nil {
break
}
fmt.Println(strings.Repeat("=", 40))
fmt.Printf("record-batch[%d]:\n", i)
PrintRecordBatch(recordBatch)
}
}
Loading
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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ARROW-984: [GLib] Add Go examples#661

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kou
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ARROW-984: [GLib] Add Go examples
#661
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5 changes: 5 additions & 0 deletions
c_glib/.gitignore

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Expand Up@@ -41,3 +41,8 @@ Makefile.in
/example/build
/example/read-batch
/example/read-stream
!/example/go/Makefile
/example/go/read-batch
/example/go/read-stream
/example/go/write-batch
/example/go/write-stream

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c_glib/example/go/Makefile

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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. See accompanying LICENSE file.

PROGRAMS = \
	read-batch \
	read-stream \
	write-batch \
	write-stream

all: build

generate:
	$$GOPATH/bin/gir-generator \
 -o $$GOPATH/src/gir/arrow-1.0 \
 -config arrow-1.0/config.json \
 arrow-1.0/arrow.go.in

build: $(PROGRAMS)

clean:
	rm -f $(PROGRAMS)

.SUFFIXES: .go

.go:
	go build -o $@ $<

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c_glib/example/go/README.md

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<!---
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License. See accompanying LICENSE file.
-->

# Arrow Go example

There are Go example codes in this directory.

## How to run

All example codes use
[go-gir-generator](https://github.com/linuxdeepin/go-gir-generator) to
use Arrow GLib based bindings.

See [../../README.md](../../README.md) how to install Arrow GLib. You
can use packages to install Arrow GLib. The following instructions
assumes that you've installed Arrow GLib by package. Package name is
`libarrow-glib-dev` on Debian GNU/Linux and Ubuntu, `arrow-glib-devel`
on CentOS.

Here are command lines to install go-gir-generator on Debian GNU/Linux
and Ubuntu:

```text
% sudo apt install -V -y libarrow-glib-dev golang git libgirepository1.0-dev libgudev-1.0-dev
% export GOPATH=$HOME
% go get github.com/linuxdeepin/go-gir-generator
% cd $GOPATH/src/github.com/linuxdeepin/go-gir-generator
% make build copyfile
% mkdir -p $GOPATH/bin/
% cp -a out/gir-generator $GOPATH/bin/
% cp -a out/src/gir/ $GOPATH/src/
```

Now, you can generate Arrow bindings for Go:

```text
% git clone https://github.com/apache/arrow.git ~/arrow
% cd ~/arrow/c_glib/example/go
% make generate
```

Then you can build all example codes:

```text
% cd ~/arrow/c_glib/example/go
% make
% ./write-batch # Write data in batch mode
% ./read-batch # Read the written batch mode data
% ./write-stream # Write data in stream mode
% ./read-stream # Read the written stream mode data
```

## Go example codes

Here are example codes in this directory:

 * `write-batch.go`: It shows how to write Arrow array to file in
 batch mode.

 * `read-batch.go`: It shows how to read Arrow array from file in
 batch mode.

 * `write-stream.go`: It shows how to write Arrow array to file in
 stream mode.

 * `read-stream.go`: It shows how to read Arrow array from file in
 stream mode.

38 changes: 38 additions & 0 deletions
c_glib/example/go/arrow-1.0/arrow.go.in

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package arrow

/*
#include "arrow.gen.h"
#cgo pkg-config: arrow-glib

[<.g_list_funcs>]
[<.g_error_free>]
[<.g_free>]
*/
import "C"
import "unsafe"

import (
	"gir/glib-2.0"
	"gir/gobject-2.0"
)

[<.go_utils>]

[<.go_bindings>]

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c_glib/example/go/arrow-1.0/config.json

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

{
 "namespace": "Arrow",
 "version": "1.0"
}

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c_glib/example/go/read-batch.go

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/batch.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewFileReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	var i uint32
	nRecordBatches := reader.GetNRecordBatches()
	for i = 0; i < nRecordBatches; i++ {
 recordBatch, err := reader.GetRecordBatch(i)
 if err != nil {
 log.Fatalf("Failed to get record batch[%d]: %v", i, err)
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}

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c_glib/example/go/read-stream.go

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/stream.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewStreamReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	for i := 0; true; i++ {
 recordBatch, err := reader.GetNextRecordBatch()
 if err != nil {
 log.Fatalf("Failed to get next record batch: %v", err)
 }
 if recordBatch == nil {
 break
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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ARROW-984: [GLib] Add Go examples
#661
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c_glib/.gitignore

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Original file line numberDiff line numberDiff line change
Expand Up@@ -41,3 +41,8 @@ Makefile.in
/example/build
/example/read-batch
/example/read-stream
!/example/go/Makefile
/example/go/read-batch
/example/go/read-stream
/example/go/write-batch
/example/go/write-stream

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c_glib/example/go/Makefile

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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. See accompanying LICENSE file.

PROGRAMS = \
	read-batch \
	read-stream \
	write-batch \
	write-stream

all: build

generate:
	$$GOPATH/bin/gir-generator \
 -o $$GOPATH/src/gir/arrow-1.0 \
 -config arrow-1.0/config.json \
 arrow-1.0/arrow.go.in

build: $(PROGRAMS)

clean:
	rm -f $(PROGRAMS)

.SUFFIXES: .go

.go:
	go build -o $@ $<

78 changes: 78 additions & 0 deletions
c_glib/example/go/README.md

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<!---
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License. See accompanying LICENSE file.
-->

# Arrow Go example

There are Go example codes in this directory.

## How to run

All example codes use
[go-gir-generator](https://github.com/linuxdeepin/go-gir-generator) to
use Arrow GLib based bindings.

See [../../README.md](../../README.md) how to install Arrow GLib. You
can use packages to install Arrow GLib. The following instructions
assumes that you've installed Arrow GLib by package. Package name is
`libarrow-glib-dev` on Debian GNU/Linux and Ubuntu, `arrow-glib-devel`
on CentOS.

Here are command lines to install go-gir-generator on Debian GNU/Linux
and Ubuntu:

```text
% sudo apt install -V -y libarrow-glib-dev golang git libgirepository1.0-dev libgudev-1.0-dev
% export GOPATH=$HOME
% go get github.com/linuxdeepin/go-gir-generator
% cd $GOPATH/src/github.com/linuxdeepin/go-gir-generator
% make build copyfile
% mkdir -p $GOPATH/bin/
% cp -a out/gir-generator $GOPATH/bin/
% cp -a out/src/gir/ $GOPATH/src/
```

Now, you can generate Arrow bindings for Go:

```text
% git clone https://github.com/apache/arrow.git ~/arrow
% cd ~/arrow/c_glib/example/go
% make generate
```

Then you can build all example codes:

```text
% cd ~/arrow/c_glib/example/go
% make
% ./write-batch # Write data in batch mode
% ./read-batch # Read the written batch mode data
% ./write-stream # Write data in stream mode
% ./read-stream # Read the written stream mode data
```

## Go example codes

Here are example codes in this directory:

 * `write-batch.go`: It shows how to write Arrow array to file in
 batch mode.

 * `read-batch.go`: It shows how to read Arrow array from file in
 batch mode.

 * `write-stream.go`: It shows how to write Arrow array to file in
 stream mode.

 * `read-stream.go`: It shows how to read Arrow array from file in
 stream mode.

38 changes: 38 additions & 0 deletions
c_glib/example/go/arrow-1.0/arrow.go.in

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package arrow

/*
#include "arrow.gen.h"
#cgo pkg-config: arrow-glib

[<.g_list_funcs>]
[<.g_error_free>]
[<.g_free>]
*/
import "C"
import "unsafe"

import (
	"gir/glib-2.0"
	"gir/gobject-2.0"
)

[<.go_utils>]

[<.go_bindings>]

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c_glib/example/go/arrow-1.0/config.json

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

{
 "namespace": "Arrow",
 "version": "1.0"
}

100 changes: 100 additions & 0 deletions
c_glib/example/go/read-batch.go

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@@ -0,0 +1,100 @@
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/batch.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewFileReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	var i uint32
	nRecordBatches := reader.GetNRecordBatches()
	for i = 0; i < nRecordBatches; i++ {
 recordBatch, err := reader.GetRecordBatch(i)
 if err != nil {
 log.Fatalf("Failed to get record batch[%d]: %v", i, err)
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}

101 changes: 101 additions & 0 deletions
c_glib/example/go/read-stream.go

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@@ -0,0 +1,101 @@
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/stream.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewStreamReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	for i := 0; true; i++ {
 recordBatch, err := reader.GetNextRecordBatch()
 if err != nil {
 log.Fatalf("Failed to get next record batch: %v", err)
 }
 if recordBatch == nil {
 break
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
ARROW-984: [GLib] Add Go examples#661

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#661
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c_glib/.gitignore

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Original file line numberDiff line numberDiff line change
Expand Up@@ -41,3 +41,8 @@ Makefile.in
/example/build
/example/read-batch
/example/read-stream
!/example/go/Makefile
/example/go/read-batch
/example/go/read-stream
/example/go/write-batch
/example/go/write-stream

35 changes: 35 additions & 0 deletions
c_glib/example/go/Makefile

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,35 @@
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. See accompanying LICENSE file.

PROGRAMS = \
	read-batch \
	read-stream \
	write-batch \
	write-stream

all: build

generate:
	$$GOPATH/bin/gir-generator \
 -o $$GOPATH/src/gir/arrow-1.0 \
 -config arrow-1.0/config.json \
 arrow-1.0/arrow.go.in

build: $(PROGRAMS)

clean:
	rm -f $(PROGRAMS)

.SUFFIXES: .go

.go:
	go build -o $@ $<

78 changes: 78 additions & 0 deletions
c_glib/example/go/README.md

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,78 @@
<!---
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License. See accompanying LICENSE file.
-->

# Arrow Go example

There are Go example codes in this directory.

## How to run

All example codes use
[go-gir-generator](https://github.com/linuxdeepin/go-gir-generator) to
use Arrow GLib based bindings.

See [../../README.md](../../README.md) how to install Arrow GLib. You
can use packages to install Arrow GLib. The following instructions
assumes that you've installed Arrow GLib by package. Package name is
`libarrow-glib-dev` on Debian GNU/Linux and Ubuntu, `arrow-glib-devel`
on CentOS.

Here are command lines to install go-gir-generator on Debian GNU/Linux
and Ubuntu:

```text
% sudo apt install -V -y libarrow-glib-dev golang git libgirepository1.0-dev libgudev-1.0-dev
% export GOPATH=$HOME
% go get github.com/linuxdeepin/go-gir-generator
% cd $GOPATH/src/github.com/linuxdeepin/go-gir-generator
% make build copyfile
% mkdir -p $GOPATH/bin/
% cp -a out/gir-generator $GOPATH/bin/
% cp -a out/src/gir/ $GOPATH/src/
```

Now, you can generate Arrow bindings for Go:

```text
% git clone https://github.com/apache/arrow.git ~/arrow
% cd ~/arrow/c_glib/example/go
% make generate
```

Then you can build all example codes:

```text
% cd ~/arrow/c_glib/example/go
% make
% ./write-batch # Write data in batch mode
% ./read-batch # Read the written batch mode data
% ./write-stream # Write data in stream mode
% ./read-stream # Read the written stream mode data
```

## Go example codes

Here are example codes in this directory:

 * `write-batch.go`: It shows how to write Arrow array to file in
 batch mode.

 * `read-batch.go`: It shows how to read Arrow array from file in
 batch mode.

 * `write-stream.go`: It shows how to write Arrow array to file in
 stream mode.

 * `read-stream.go`: It shows how to read Arrow array from file in
 stream mode.

38 changes: 38 additions & 0 deletions
c_glib/example/go/arrow-1.0/arrow.go.in

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@@ -0,0 +1,38 @@
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package arrow

/*
#include "arrow.gen.h"
#cgo pkg-config: arrow-glib

[<.g_list_funcs>]
[<.g_error_free>]
[<.g_free>]
*/
import "C"
import "unsafe"

import (
	"gir/glib-2.0"
	"gir/gobject-2.0"
)

[<.go_utils>]

[<.go_bindings>]

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c_glib/example/go/arrow-1.0/config.json

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

{
 "namespace": "Arrow",
 "version": "1.0"
}

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c_glib/example/go/read-batch.go

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/batch.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewFileReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	var i uint32
	nRecordBatches := reader.GetNRecordBatches()
	for i = 0; i < nRecordBatches; i++ {
 recordBatch, err := reader.GetRecordBatch(i)
 if err != nil {
 log.Fatalf("Failed to get record batch[%d]: %v", i, err)
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}

101 changes: 101 additions & 0 deletions
c_glib/example/go/read-stream.go

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/stream.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewStreamReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	for i := 0; true; i++ {
 recordBatch, err := reader.GetNextRecordBatch()
 if err != nil {
 log.Fatalf("Failed to get next record batch: %v", err)
 }
 if recordBatch == nil {
 break
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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ARROW-984: [GLib] Add Go examples#661

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5 changes: 5 additions & 0 deletions
c_glib/.gitignore

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Original file line numberDiff line numberDiff line change
Expand Up@@ -41,3 +41,8 @@ Makefile.in
/example/build
/example/read-batch
/example/read-stream
!/example/go/Makefile
/example/go/read-batch
/example/go/read-stream
/example/go/write-batch
/example/go/write-stream

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c_glib/example/go/Makefile

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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. See accompanying LICENSE file.

PROGRAMS = \
	read-batch \
	read-stream \
	write-batch \
	write-stream

all: build

generate:
	$$GOPATH/bin/gir-generator \
 -o $$GOPATH/src/gir/arrow-1.0 \
 -config arrow-1.0/config.json \
 arrow-1.0/arrow.go.in

build: $(PROGRAMS)

clean:
	rm -f $(PROGRAMS)

.SUFFIXES: .go

.go:
	go build -o $@ $<

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c_glib/example/go/README.md

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<!---
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License. See accompanying LICENSE file.
-->

# Arrow Go example

There are Go example codes in this directory.

## How to run

All example codes use
[go-gir-generator](https://github.com/linuxdeepin/go-gir-generator) to
use Arrow GLib based bindings.

See [../../README.md](../../README.md) how to install Arrow GLib. You
can use packages to install Arrow GLib. The following instructions
assumes that you've installed Arrow GLib by package. Package name is
`libarrow-glib-dev` on Debian GNU/Linux and Ubuntu, `arrow-glib-devel`
on CentOS.

Here are command lines to install go-gir-generator on Debian GNU/Linux
and Ubuntu:

```text
% sudo apt install -V -y libarrow-glib-dev golang git libgirepository1.0-dev libgudev-1.0-dev
% export GOPATH=$HOME
% go get github.com/linuxdeepin/go-gir-generator
% cd $GOPATH/src/github.com/linuxdeepin/go-gir-generator
% make build copyfile
% mkdir -p $GOPATH/bin/
% cp -a out/gir-generator $GOPATH/bin/
% cp -a out/src/gir/ $GOPATH/src/
```

Now, you can generate Arrow bindings for Go:

```text
% git clone https://github.com/apache/arrow.git ~/arrow
% cd ~/arrow/c_glib/example/go
% make generate
```

Then you can build all example codes:

```text
% cd ~/arrow/c_glib/example/go
% make
% ./write-batch # Write data in batch mode
% ./read-batch # Read the written batch mode data
% ./write-stream # Write data in stream mode
% ./read-stream # Read the written stream mode data
```

## Go example codes

Here are example codes in this directory:

 * `write-batch.go`: It shows how to write Arrow array to file in
 batch mode.

 * `read-batch.go`: It shows how to read Arrow array from file in
 batch mode.

 * `write-stream.go`: It shows how to write Arrow array to file in
 stream mode.

 * `read-stream.go`: It shows how to read Arrow array from file in
 stream mode.

38 changes: 38 additions & 0 deletions
c_glib/example/go/arrow-1.0/arrow.go.in

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package arrow

/*
#include "arrow.gen.h"
#cgo pkg-config: arrow-glib

[<.g_list_funcs>]
[<.g_error_free>]
[<.g_free>]
*/
import "C"
import "unsafe"

import (
	"gir/glib-2.0"
	"gir/gobject-2.0"
)

[<.go_utils>]

[<.go_bindings>]

21 changes: 21 additions & 0 deletions
c_glib/example/go/arrow-1.0/config.json

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

{
 "namespace": "Arrow",
 "version": "1.0"
}

100 changes: 100 additions & 0 deletions
c_glib/example/go/read-batch.go

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/batch.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewFileReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	var i uint32
	nRecordBatches := reader.GetNRecordBatches()
	for i = 0; i < nRecordBatches; i++ {
 recordBatch, err := reader.GetRecordBatch(i)
 if err != nil {
 log.Fatalf("Failed to get record batch[%d]: %v", i, err)
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}

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c_glib/example/go/read-stream.go

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/stream.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewStreamReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	for i := 0; true; i++ {
 recordBatch, err := reader.GetNextRecordBatch()
 if err != nil {
 log.Fatalf("Failed to get next record batch: %v", err)
 }
 if recordBatch == nil {
 break
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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ARROW-984: [GLib] Add Go examples#661

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ARROW-984: [GLib] Add Go examples
#661
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5 changes: 5 additions & 0 deletions
c_glib/.gitignore

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Expand Up@@ -41,3 +41,8 @@ Makefile.in
/example/build
/example/read-batch
/example/read-stream
!/example/go/Makefile
/example/go/read-batch
/example/go/read-stream
/example/go/write-batch
/example/go/write-stream

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c_glib/example/go/Makefile

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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. See accompanying LICENSE file.

PROGRAMS = \
	read-batch \
	read-stream \
	write-batch \
	write-stream

all: build

generate:
	$$GOPATH/bin/gir-generator \
 -o $$GOPATH/src/gir/arrow-1.0 \
 -config arrow-1.0/config.json \
 arrow-1.0/arrow.go.in

build: $(PROGRAMS)

clean:
	rm -f $(PROGRAMS)

.SUFFIXES: .go

.go:
	go build -o $@ $<

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c_glib/example/go/README.md

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<!---
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License. See accompanying LICENSE file.
-->

# Arrow Go example

There are Go example codes in this directory.

## How to run

All example codes use
[go-gir-generator](https://github.com/linuxdeepin/go-gir-generator) to
use Arrow GLib based bindings.

See [../../README.md](../../README.md) how to install Arrow GLib. You
can use packages to install Arrow GLib. The following instructions
assumes that you've installed Arrow GLib by package. Package name is
`libarrow-glib-dev` on Debian GNU/Linux and Ubuntu, `arrow-glib-devel`
on CentOS.

Here are command lines to install go-gir-generator on Debian GNU/Linux
and Ubuntu:

```text
% sudo apt install -V -y libarrow-glib-dev golang git libgirepository1.0-dev libgudev-1.0-dev
% export GOPATH=$HOME
% go get github.com/linuxdeepin/go-gir-generator
% cd $GOPATH/src/github.com/linuxdeepin/go-gir-generator
% make build copyfile
% mkdir -p $GOPATH/bin/
% cp -a out/gir-generator $GOPATH/bin/
% cp -a out/src/gir/ $GOPATH/src/
```

Now, you can generate Arrow bindings for Go:

```text
% git clone https://github.com/apache/arrow.git ~/arrow
% cd ~/arrow/c_glib/example/go
% make generate
```

Then you can build all example codes:

```text
% cd ~/arrow/c_glib/example/go
% make
% ./write-batch # Write data in batch mode
% ./read-batch # Read the written batch mode data
% ./write-stream # Write data in stream mode
% ./read-stream # Read the written stream mode data
```

## Go example codes

Here are example codes in this directory:

 * `write-batch.go`: It shows how to write Arrow array to file in
 batch mode.

 * `read-batch.go`: It shows how to read Arrow array from file in
 batch mode.

 * `write-stream.go`: It shows how to write Arrow array to file in
 stream mode.

 * `read-stream.go`: It shows how to read Arrow array from file in
 stream mode.

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c_glib/example/go/arrow-1.0/arrow.go.in

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package arrow

/*
#include "arrow.gen.h"
#cgo pkg-config: arrow-glib

[<.g_list_funcs>]
[<.g_error_free>]
[<.g_free>]
*/
import "C"
import "unsafe"

import (
	"gir/glib-2.0"
	"gir/gobject-2.0"
)

[<.go_utils>]

[<.go_bindings>]

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c_glib/example/go/arrow-1.0/config.json

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

{
 "namespace": "Arrow",
 "version": "1.0"
}

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c_glib/example/go/read-batch.go

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/batch.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewFileReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	var i uint32
	nRecordBatches := reader.GetNRecordBatches()
	for i = 0; i < nRecordBatches; i++ {
 recordBatch, err := reader.GetRecordBatch(i)
 if err != nil {
 log.Fatalf("Failed to get record batch[%d]: %v", i, err)
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}

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c_glib/example/go/read-stream.go

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/stream.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewStreamReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	for i := 0; true; i++ {
 recordBatch, err := reader.GetNextRecordBatch()
 if err != nil {
 log.Fatalf("Failed to get next record batch: %v", err)
 }
 if recordBatch == nil {
 break
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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from

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ARROW-984: [GLib] Add Go examples
#661
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c_glib/.gitignore

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Original file line numberDiff line numberDiff line change
Expand Up@@ -41,3 +41,8 @@ Makefile.in
/example/build
/example/read-batch
/example/read-stream
!/example/go/Makefile
/example/go/read-batch
/example/go/read-stream
/example/go/write-batch
/example/go/write-stream

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c_glib/example/go/Makefile

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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. See accompanying LICENSE file.

PROGRAMS = \
	read-batch \
	read-stream \
	write-batch \
	write-stream

all: build

generate:
	$$GOPATH/bin/gir-generator \
 -o $$GOPATH/src/gir/arrow-1.0 \
 -config arrow-1.0/config.json \
 arrow-1.0/arrow.go.in

build: $(PROGRAMS)

clean:
	rm -f $(PROGRAMS)

.SUFFIXES: .go

.go:
	go build -o $@ $<

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c_glib/example/go/README.md

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<!---
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License. See accompanying LICENSE file.
-->

# Arrow Go example

There are Go example codes in this directory.

## How to run

All example codes use
[go-gir-generator](https://github.com/linuxdeepin/go-gir-generator) to
use Arrow GLib based bindings.

See [../../README.md](../../README.md) how to install Arrow GLib. You
can use packages to install Arrow GLib. The following instructions
assumes that you've installed Arrow GLib by package. Package name is
`libarrow-glib-dev` on Debian GNU/Linux and Ubuntu, `arrow-glib-devel`
on CentOS.

Here are command lines to install go-gir-generator on Debian GNU/Linux
and Ubuntu:

```text
% sudo apt install -V -y libarrow-glib-dev golang git libgirepository1.0-dev libgudev-1.0-dev
% export GOPATH=$HOME
% go get github.com/linuxdeepin/go-gir-generator
% cd $GOPATH/src/github.com/linuxdeepin/go-gir-generator
% make build copyfile
% mkdir -p $GOPATH/bin/
% cp -a out/gir-generator $GOPATH/bin/
% cp -a out/src/gir/ $GOPATH/src/
```

Now, you can generate Arrow bindings for Go:

```text
% git clone https://github.com/apache/arrow.git ~/arrow
% cd ~/arrow/c_glib/example/go
% make generate
```

Then you can build all example codes:

```text
% cd ~/arrow/c_glib/example/go
% make
% ./write-batch # Write data in batch mode
% ./read-batch # Read the written batch mode data
% ./write-stream # Write data in stream mode
% ./read-stream # Read the written stream mode data
```

## Go example codes

Here are example codes in this directory:

 * `write-batch.go`: It shows how to write Arrow array to file in
 batch mode.

 * `read-batch.go`: It shows how to read Arrow array from file in
 batch mode.

 * `write-stream.go`: It shows how to write Arrow array to file in
 stream mode.

 * `read-stream.go`: It shows how to read Arrow array from file in
 stream mode.

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c_glib/example/go/arrow-1.0/arrow.go.in

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package arrow

/*
#include "arrow.gen.h"
#cgo pkg-config: arrow-glib

[<.g_list_funcs>]
[<.g_error_free>]
[<.g_free>]
*/
import "C"
import "unsafe"

import (
	"gir/glib-2.0"
	"gir/gobject-2.0"
)

[<.go_utils>]

[<.go_bindings>]

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c_glib/example/go/arrow-1.0/config.json

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

{
 "namespace": "Arrow",
 "version": "1.0"
}

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c_glib/example/go/read-batch.go

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/batch.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewFileReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	var i uint32
	nRecordBatches := reader.GetNRecordBatches()
	for i = 0; i < nRecordBatches; i++ {
 recordBatch, err := reader.GetRecordBatch(i)
 if err != nil {
 log.Fatalf("Failed to get record batch[%d]: %v", i, err)
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}

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c_glib/example/go/read-stream.go

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/stream.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewStreamReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	for i := 0; true; i++ {
 recordBatch, err := reader.GetNextRecordBatch()
 if err != nil {
 log.Fatalf("Failed to get next record batch: %v", err)
 }
 if recordBatch == nil {
 break
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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ARROW-984: [GLib] Add Go examples#661

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ARROW-984: [GLib] Add Go examples
#661
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5 changes: 5 additions & 0 deletions
c_glib/.gitignore

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Expand Up@@ -41,3 +41,8 @@ Makefile.in
/example/build
/example/read-batch
/example/read-stream
!/example/go/Makefile
/example/go/read-batch
/example/go/read-stream
/example/go/write-batch
/example/go/write-stream

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c_glib/example/go/Makefile

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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. See accompanying LICENSE file.

PROGRAMS = \
	read-batch \
	read-stream \
	write-batch \
	write-stream

all: build

generate:
	$$GOPATH/bin/gir-generator \
 -o $$GOPATH/src/gir/arrow-1.0 \
 -config arrow-1.0/config.json \
 arrow-1.0/arrow.go.in

build: $(PROGRAMS)

clean:
	rm -f $(PROGRAMS)

.SUFFIXES: .go

.go:
	go build -o $@ $<

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c_glib/example/go/README.md

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@@ -0,0 +1,78 @@
<!---
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License. See accompanying LICENSE file.
-->

# Arrow Go example

There are Go example codes in this directory.

## How to run

All example codes use
[go-gir-generator](https://github.com/linuxdeepin/go-gir-generator) to
use Arrow GLib based bindings.

See [../../README.md](../../README.md) how to install Arrow GLib. You
can use packages to install Arrow GLib. The following instructions
assumes that you've installed Arrow GLib by package. Package name is
`libarrow-glib-dev` on Debian GNU/Linux and Ubuntu, `arrow-glib-devel`
on CentOS.

Here are command lines to install go-gir-generator on Debian GNU/Linux
and Ubuntu:

```text
% sudo apt install -V -y libarrow-glib-dev golang git libgirepository1.0-dev libgudev-1.0-dev
% export GOPATH=$HOME
% go get github.com/linuxdeepin/go-gir-generator
% cd $GOPATH/src/github.com/linuxdeepin/go-gir-generator
% make build copyfile
% mkdir -p $GOPATH/bin/
% cp -a out/gir-generator $GOPATH/bin/
% cp -a out/src/gir/ $GOPATH/src/
```

Now, you can generate Arrow bindings for Go:

```text
% git clone https://github.com/apache/arrow.git ~/arrow
% cd ~/arrow/c_glib/example/go
% make generate
```

Then you can build all example codes:

```text
% cd ~/arrow/c_glib/example/go
% make
% ./write-batch # Write data in batch mode
% ./read-batch # Read the written batch mode data
% ./write-stream # Write data in stream mode
% ./read-stream # Read the written stream mode data
```

## Go example codes

Here are example codes in this directory:

 * `write-batch.go`: It shows how to write Arrow array to file in
 batch mode.

 * `read-batch.go`: It shows how to read Arrow array from file in
 batch mode.

 * `write-stream.go`: It shows how to write Arrow array to file in
 stream mode.

 * `read-stream.go`: It shows how to read Arrow array from file in
 stream mode.

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c_glib/example/go/arrow-1.0/arrow.go.in

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package arrow

/*
#include "arrow.gen.h"
#cgo pkg-config: arrow-glib

[<.g_list_funcs>]
[<.g_error_free>]
[<.g_free>]
*/
import "C"
import "unsafe"

import (
	"gir/glib-2.0"
	"gir/gobject-2.0"
)

[<.go_utils>]

[<.go_bindings>]

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c_glib/example/go/arrow-1.0/config.json

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

{
 "namespace": "Arrow",
 "version": "1.0"
}

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c_glib/example/go/read-batch.go

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/batch.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewFileReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	var i uint32
	nRecordBatches := reader.GetNRecordBatches()
	for i = 0; i < nRecordBatches; i++ {
 recordBatch, err := reader.GetRecordBatch(i)
 if err != nil {
 log.Fatalf("Failed to get record batch[%d]: %v", i, err)
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}

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c_glib/example/go/read-stream.go

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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.

package main

import (
	"os"
	"log"
	"fmt"
	"strings"
)

import "gir/arrow-1.0"

func PrintColumnValue(column *arrow.Array, i int64) {
	valueType := column.GetValueType()
	switch valueType {
	case arrow.TypeUint8:
 fmt.Print(arrow.ToUInt8Array(column).GetValue(i))
	case arrow.TypeUint16:
 fmt.Print(arrow.ToUInt16Array(column).GetValue(i))
	case arrow.TypeUint32:
 fmt.Print(arrow.ToUInt32Array(column).GetValue(i))
	case arrow.TypeUint64:
 fmt.Print(arrow.ToUInt64Array(column).GetValue(i))
	case arrow.TypeInt8:
 fmt.Print(arrow.ToInt8Array(column).GetValue(i))
	case arrow.TypeInt16:
 fmt.Print(arrow.ToInt16Array(column).GetValue(i))
	case arrow.TypeInt32:
 fmt.Print(arrow.ToInt32Array(column).GetValue(i))
	case arrow.TypeInt64:
 fmt.Print(arrow.ToInt64Array(column).GetValue(i))
	case arrow.TypeFloat:
 fmt.Print(arrow.ToFloatArray(column).GetValue(i))
	case arrow.TypeDouble:
 fmt.Print(arrow.ToDoubleArray(column).GetValue(i))
	default:
 fmt.Printf("unknown(%s)", valueType)
	}
}

func PrintRecordBatch(recordBatch *arrow.RecordBatch) {
	nColumns := recordBatch.GetNColumns()
	for i := uint32(0); i < nColumns; i++ {
 column := recordBatch.GetColumn(i)
 columnName := recordBatch.GetColumnName(i)
 fmt.Printf(" %s: [", columnName)
 nRows := recordBatch.GetNRows()
 for j := int64(0); j < nRows; j++ {
 if j > 0 {
 fmt.Print(", ")
 }
 PrintColumnValue(column, j)
 }
 fmt.Println("]")
	}
}

func main() {
	var path string
	if len(os.Args) < 2 {
 path = "/tmp/stream.arrow"
	} else {
 path = os.Args[1]
	}
	input, err := arrow.NewMemoryMappedInputStream(path);
	if err != nil {
 log.Fatalf("Failed to open path: <%s>: %v", path, err)
	}
	reader, err := arrow.NewStreamReader(input)
	if err != nil {
 log.Fatalf("Failed to parse data: %v", err)
	}
	for i := 0; true; i++ {
 recordBatch, err := reader.GetNextRecordBatch()
 if err != nil {
 log.Fatalf("Failed to get next record batch: %v", err)
 }
 if recordBatch == nil {
 break
 }
 fmt.Println(strings.Repeat("=", 40))
 fmt.Printf("record-batch[%d]:\n", i)
 PrintRecordBatch(recordBatch)
	}
}
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