GH-37770: [MATLAB] Add CSV `TableReader` and `TableWriter` MATLAB classes by kevingurney · Pull Request #37773 · apache/arrow

kevingurney · 2023-09-18T15:57:01Z

Rationale for this change

To enable initial CSV I/O support, this PR adds arrow.io.csv.TableReader and arrow.io.csv.TableWriter MATLAB classes to the MATLAB interface.

What changes are included in this PR?

Added a new arrow.io.csv.TableReader class
Added a new arrow.io.csv.TableWriter class

Example

>> matlabTableWrite= array2table(rand(3))
matlabTableWrite =3×3 tableVar1Var2 Var3 _______________ _______0.911310.0915950.245940.513150.273680.621190.429420.886650.49501
>> arrowTableWrite=arrow.table(matlabTableWrite)
arrowTableWrite =Var1:doubleVar2:doubleVar3:double
----
Var1:
[
[
0.9113083542736461,
0.5131490075412158,
0.42942202968065213
]
]
Var2:
[
[
0.09159480217154525,
0.27367730380496647,
0.8866478145458545
]
]
Var3:
[
[
0.2459443412735529,
0.6211893868708748,
0.49500739584280073
]
]
>> writer=arrow.io.csv.TableWriter("example.csv")
writer =TableWriterwith properties:Filename:"example.csv"
>> writer.write(arrowTableWrite)
>> reader=arrow.io.csv.TableReader("example.csv")
reader =TableReaderwith properties:Filename:"example.csv"
>> arrowTableRead=reader.read()
arrowTableRead =Var1:doubleVar2:doubleVar3:double
----
Var1:
[
[
0.9113083542736461,
0.5131490075412158,
0.42942202968065213
]
]
Var2:
[
[
0.09159480217154525,
0.27367730380496647,
0.8866478145458545
]
]
Var3:
[
[
0.2459443412735529,
0.6211893868708748,
0.49500739584280073
]
]
>> matlabTableRead= table(arrowTableRead)
matlabTableRead =3×3 tableVar1Var2 Var3 _______________ _______0.911310.0915950.245940.513150.273680.621190.429420.886650.49501
>> isequal(arrowTableRead, arrowTableWrite)
ans =logical1
>> isequal(matlabTableRead, matlabTableWrite)
ans =logical1

Are these changes tested?

Yes.

Added new CSV I/O tests including test/arrow/io/csv/tRoundTrip.m and test/arrow/io/csv/tError.m.
Both of these test classes inherit from a CSVTest superclass.

Are there any user-facing changes?

Yes.

Users can now read and write CSV files using arrow.io.csv.TableReader and arrow.io.csv.TableWriter.

Future Directions

Expose options for controlling CSV reading and writing in MATLAB.
Add more read/write tests for null value handling and other datatypes beyond numeric and string values.
Add a RecordBatchReader and RecordBatchWriter for CSV.
Add support for more I/O formats like Parquet, JSON, ORC, Arrow IPC, etc.

Notes

Thank you @sgilmore10 for your help with this pull request!
I chose to add both the TableReader and TableWriter in one pull request because it simplified testing. My apologies for the slightly lengthy pull request.

Closes: [MATLAB] Add CSV TableReader and TableWriter MATLAB classes #37770

github-actions · 2023-09-18T15:57:31Z

⚠️ GitHub issue #37770has been automatically assigned in GitHub to PR creator.

sgilmore10

This looks good! Thanks for adding the base test class and test utilities. We can re-use these in the future for other file types!

kevingurney · 2023-09-18T17:11:00Z

It looks like the ARROW_CSV component is currently not enabled in the Arrow C++ libraries ExternalProject build in the MATLAB CI workflow.

I just pushed a commit that enables this.

kevingurney · 2023-09-18T19:03:20Z

Enabling building of the ARROW_CSV component caused some build failures due to RapidJSON being inaccessible when building integration tests:

https://github.com/apache/arrow/actions/runs/6225733757/job/16896790846?pr=37773#step:9:681.

We could try to fix these build failures by explicitly installing RapidJSON into the GitHub Actions environments. However, considering that we were already considering removing GoogleTest support from the MATLAB build system - it might be better to just use this opportunity to do that (this is what the Python bindings did, as well).

I have already confirmed that not building the Arrow C++ library tests when ARROW_CSV is enabled does work on all platforms in another CI job in mathworks/arrow:

https://github.com/mathworks/arrow/actions/runs/6226385022

I'll start working on a separate PR to remove GoogleTest support from the CMake build system for the MATLAB interface. In the meantime, I will leave this PR open, and I will rebase once GoogleTest support has been removed.

kevingurney · 2023-09-18T20:00:27Z

For reference, I am working on the changes required to remove GoogleTest support from the CMake build system of the MATLAB interface here: https://github.com/mathworks/arrow/tree/GH-37532.

kevingurney · 2023-09-18T21:42:32Z

For reference - I've opened #37784 for removing GoogleTest support.

…ke build system for the MATLAB interface (#37784) ### Rationale for this change This pull request removes `GoogleTest` support from the CMake build system for the MATLAB interface. 1. `GoogleTest` support adds a lot of additional complexity to the CMake build system for the MATLAB interface, and we currently don't have any standalone C++ tests for the MATLAB interface code. 2. In order to use `GoogleTest` in the MATLAB CI workflows, we are currently relying on building the tests for the Arrow C++ libraries in order to "re-use" the `GoogleTest binaries. This adds additional overhead to the MATLAB CI workflows. 3. If we want to test some internal C++ code for the MATLAB interface in the future, we can instead use a MEX function to call the code from a MATLAB test as suggested by @ kou in #37532 (comment). 4. There is [precedent for testing internal C++ code without GoogleTest for the Python bindings](#14117). 5. On a somewhat related note - removing `GoogleTest` support will help unblock #37773 as discussed in #37773 (comment). ### What changes are included in this PR? 1. Removed the `MATLAB_BUILD_TESTS` flag from the CMake build system for the MATLAB interface since there are no longer any C++ tests for the MATLAB interface to build. 2. Updated the `matlab_build.sh` CI workflow script to avoid building the tests for the Arrow C++ libraries and to no longer call `ctest`. 3. Updated the `README.md` for the MATLAB interface to no longer mention building or running C++ tests. 4. Updated the design document for the MATLAB Interface to no longer mention `GoogleTest` since we may end up testing internal C++ code using MEX function calls from MATLAB instead. 5. Removed placeholder C++ test (i.e. `placeholder_test.cc`). ### Are these changes tested? Yes. The MATLAB CI workflow is passing on all platforms. ### Are there any user-facing changes? Yes. There are no longer any C++ tests for the MATLAB interface. The `MATLAB_BUILD_TESTS` flag has been removed from the CMake build system to reflect this change. If a user supplies a value for `MATLAB_BUILD_TESTS` when building the MATLAB interface, the flag will be ignored by CMake. ### Future Directions 1. Add more developer-focused documentation on how to test C++ code via MEX function calls from MATLAB. ### Notes 1. In the future, we can consider testing internal C++ code using MEX function calls from MATLAB tests as suggested by @ kou in #37532 (comment). Currently, we don't have any C++ tests that need to be adapted to use this approach. 2. Thank you @ sgilmore10 for your help with this pull request! * Closes: #37532 Lead-authored-by: Kevin Gurney <kgurney@mathworks.com> Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com> Signed-off-by: Kevin Gurney <kgurney@mathworks.com>

kevingurney · 2023-09-19T20:40:47Z

Update: the code to remove GoogleTest support from the MATLAB interface was merged in #37784.

Now that the Arrow C++ tests are no longer being built, enabling ARROW_CSV in the MATLAB build works without any issues.

At this point, these changes should be ready to merge.

kou

+1

kevingurney · 2023-09-20T14:42:13Z

The failures for the Dev / Source Release and Merge Script CI workflow seem unrelated to this PR.

kevingurney · 2023-09-20T15:00:16Z

CI failures are related to #37803.

kevingurney · 2023-09-20T15:02:02Z

+1

2. Change `write` method to take in an `arrow.tabular.Table`, rather than an `arrow.tabular.RecordBatch`. 3. Add basic implementation of `arrow.io.csv.TableReader` class. Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com>

Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com>

2. Create CSV test superclass. 3. Add tError test class. Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com>

…iter filename argument. 2. Add basic error tests for TableReader and TableWriter. Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com>

2. Add more error tests. Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com>

…rkflow script. Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com>

kevingurney · 2023-09-20T18:15:27Z

#37808 has been merged.

I just rebased these changes on top of main so that the latest MATLAB CI workflows will run.

kevingurney · 2023-09-20T18:28:49Z

The MATLAB CI workflows are passing now.

I will merge this PR.

kevingurney · 2023-09-20T18:29:01Z

+1

conbench-apache-arrow · 2023-09-21T05:44:18Z

After merging your PR, Conbench analyzed the 5 benchmarking runs that have been run so far on merge-commit 2b34e37.

There were no benchmark performance regressions. 🎉

The full Conbench report has more details. It also includes information about possible false positives for unstable benchmarks that are known to sometimes produce them.

…he CMake build system for the MATLAB interface (apache#37784) ### Rationale for this change This pull request removes `GoogleTest` support from the CMake build system for the MATLAB interface. 1. `GoogleTest` support adds a lot of additional complexity to the CMake build system for the MATLAB interface, and we currently don't have any standalone C++ tests for the MATLAB interface code. 2. In order to use `GoogleTest` in the MATLAB CI workflows, we are currently relying on building the tests for the Arrow C++ libraries in order to "re-use" the `GoogleTest binaries. This adds additional overhead to the MATLAB CI workflows. 3. If we want to test some internal C++ code for the MATLAB interface in the future, we can instead use a MEX function to call the code from a MATLAB test as suggested by @ kou in apache#37532 (comment). 4. There is [precedent for testing internal C++ code without GoogleTest for the Python bindings](apache#14117). 5. On a somewhat related note - removing `GoogleTest` support will help unblock apache#37773 as discussed in apache#37773 (comment). ### What changes are included in this PR? 1. Removed the `MATLAB_BUILD_TESTS` flag from the CMake build system for the MATLAB interface since there are no longer any C++ tests for the MATLAB interface to build. 2. Updated the `matlab_build.sh` CI workflow script to avoid building the tests for the Arrow C++ libraries and to no longer call `ctest`. 3. Updated the `README.md` for the MATLAB interface to no longer mention building or running C++ tests. 4. Updated the design document for the MATLAB Interface to no longer mention `GoogleTest` since we may end up testing internal C++ code using MEX function calls from MATLAB instead. 5. Removed placeholder C++ test (i.e. `placeholder_test.cc`). ### Are these changes tested? Yes. The MATLAB CI workflow is passing on all platforms. ### Are there any user-facing changes? Yes. There are no longer any C++ tests for the MATLAB interface. The `MATLAB_BUILD_TESTS` flag has been removed from the CMake build system to reflect this change. If a user supplies a value for `MATLAB_BUILD_TESTS` when building the MATLAB interface, the flag will be ignored by CMake. ### Future Directions 1. Add more developer-focused documentation on how to test C++ code via MEX function calls from MATLAB. ### Notes 1. In the future, we can consider testing internal C++ code using MEX function calls from MATLAB tests as suggested by @ kou in apache#37532 (comment). Currently, we don't have any C++ tests that need to be adapted to use this approach. 2. Thank you @ sgilmore10 for your help with this pull request! * Closes: apache#37532 Lead-authored-by: Kevin Gurney <kgurney@mathworks.com> Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com> Signed-off-by: Kevin Gurney <kgurney@mathworks.com>

…AB classes (apache#37773) ### Rationale for this change To enable initial CSV I/O support, this PR adds `arrow.io.csv.TableReader` and `arrow.io.csv.TableWriter` MATLAB classes to the MATLAB interface. ### What changes are included in this PR? 1. Added a new `arrow.io.csv.TableReader` class 2. Added a new `arrow.io.csv.TableWriter` class **Example** ```matlab >> matlabTableWrite = array2table(rand(3)) matlabTableWrite = 3×3 table Var1 Var2 Var3 _______ ________ _______ 0.91131 0.091595 0.24594 0.51315 0.27368 0.62119 0.42942 0.88665 0.49501 >> arrowTableWrite = arrow.table(matlabTableWrite) arrowTableWrite = Var1: double Var2: double Var3: double ---- Var1: [ [ 0.9113083542736461, 0.5131490075412158, 0.42942202968065213 ] ] Var2: [ [ 0.09159480217154525, 0.27367730380496647, 0.8866478145458545 ] ] Var3: [ [ 0.2459443412735529, 0.6211893868708748, 0.49500739584280073 ] ] >> writer = arrow.io.csv.TableWriter("example.csv") writer = TableWriter with properties: Filename: "example.csv" >> writer.write(arrowTableWrite) >> reader = arrow.io.csv.TableReader("example.csv") reader = TableReader with properties: Filename: "example.csv" >> arrowTableRead = reader.read() arrowTableRead = Var1: double Var2: double Var3: double ---- Var1: [ [ 0.9113083542736461, 0.5131490075412158, 0.42942202968065213 ] ] Var2: [ [ 0.09159480217154525, 0.27367730380496647, 0.8866478145458545 ] ] Var3: [ [ 0.2459443412735529, 0.6211893868708748, 0.49500739584280073 ] ] >> matlabTableRead = table(arrowTableRead) matlabTableRead = 3×3 table Var1 Var2 Var3 _______ ________ _______ 0.91131 0.091595 0.24594 0.51315 0.27368 0.62119 0.42942 0.88665 0.49501 >> isequal(arrowTableRead, arrowTableWrite) ans = logical 1 >> isequal(matlabTableRead, matlabTableWrite) ans = logical 1 ``` ### Are these changes tested? Yes. 1. Added new CSV I/O tests including `test/arrow/io/csv/tRoundTrip.m` and `test/arrow/io/csv/tError.m`. 2. Both of these test classes inherit from a `CSVTest` superclass. ### Are there any user-facing changes? Yes. 1. Users can now read and write CSV files using `arrow.io.csv.TableReader` and `arrow.io.csv.TableWriter`. ### Future Directions 1. Expose [options](https://github.com/apache/arrow/blob/main/cpp/src/arrow/csv/options.h) for controlling CSV reading and writing in MATLAB. 2. Add more read/write tests for null value handling and other datatypes beyond numeric and string values. 4. Add a `RecordBatchReader` and `RecordBatchWriter` for CSV. 5. Add support for more I/O formats like Parquet, JSON, ORC, Arrow IPC, etc. ### Notes 1. Thank you @ sgilmore10 for your help with this pull request! 2. I chose to add both the `TableReader` and `TableWriter` in one pull request because it simplified testing. My apologies for the slightly lengthy pull request. * Closes: apache#37770 Lead-authored-by: Kevin Gurney <kgurney@mathworks.com> Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com> Signed-off-by: Kevin Gurney <kgurney@mathworks.com>

…he CMake build system for the MATLAB interface (apache#37784) ### Rationale for this change This pull request removes `GoogleTest` support from the CMake build system for the MATLAB interface. 1. `GoogleTest` support adds a lot of additional complexity to the CMake build system for the MATLAB interface, and we currently don't have any standalone C++ tests for the MATLAB interface code. 2. In order to use `GoogleTest` in the MATLAB CI workflows, we are currently relying on building the tests for the Arrow C++ libraries in order to "re-use" the `GoogleTest binaries. This adds additional overhead to the MATLAB CI workflows. 3. If we want to test some internal C++ code for the MATLAB interface in the future, we can instead use a MEX function to call the code from a MATLAB test as suggested by @ kou in apache#37532 (comment). 4. There is [precedent for testing internal C++ code without GoogleTest for the Python bindings](apache#14117). 5. On a somewhat related note - removing `GoogleTest` support will help unblock apache#37773 as discussed in apache#37773 (comment). ### What changes are included in this PR? 1. Removed the `MATLAB_BUILD_TESTS` flag from the CMake build system for the MATLAB interface since there are no longer any C++ tests for the MATLAB interface to build. 2. Updated the `matlab_build.sh` CI workflow script to avoid building the tests for the Arrow C++ libraries and to no longer call `ctest`. 3. Updated the `README.md` for the MATLAB interface to no longer mention building or running C++ tests. 4. Updated the design document for the MATLAB Interface to no longer mention `GoogleTest` since we may end up testing internal C++ code using MEX function calls from MATLAB instead. 5. Removed placeholder C++ test (i.e. `placeholder_test.cc`). ### Are these changes tested? Yes. The MATLAB CI workflow is passing on all platforms. ### Are there any user-facing changes? Yes. There are no longer any C++ tests for the MATLAB interface. The `MATLAB_BUILD_TESTS` flag has been removed from the CMake build system to reflect this change. If a user supplies a value for `MATLAB_BUILD_TESTS` when building the MATLAB interface, the flag will be ignored by CMake. ### Future Directions 1. Add more developer-focused documentation on how to test C++ code via MEX function calls from MATLAB. ### Notes 1. In the future, we can consider testing internal C++ code using MEX function calls from MATLAB tests as suggested by @ kou in apache#37532 (comment). Currently, we don't have any C++ tests that need to be adapted to use this approach. 2. Thank you @ sgilmore10 for your help with this pull request! * Closes: apache#37532 Lead-authored-by: Kevin Gurney <kgurney@mathworks.com> Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com> Signed-off-by: Kevin Gurney <kgurney@mathworks.com>

…AB classes (apache#37773) ### Rationale for this change To enable initial CSV I/O support, this PR adds `arrow.io.csv.TableReader` and `arrow.io.csv.TableWriter` MATLAB classes to the MATLAB interface. ### What changes are included in this PR? 1. Added a new `arrow.io.csv.TableReader` class 2. Added a new `arrow.io.csv.TableWriter` class **Example** ```matlab >> matlabTableWrite = array2table(rand(3)) matlabTableWrite = 3×3 table Var1 Var2 Var3 _______ ________ _______ 0.91131 0.091595 0.24594 0.51315 0.27368 0.62119 0.42942 0.88665 0.49501 >> arrowTableWrite = arrow.table(matlabTableWrite) arrowTableWrite = Var1: double Var2: double Var3: double ---- Var1: [ [ 0.9113083542736461, 0.5131490075412158, 0.42942202968065213 ] ] Var2: [ [ 0.09159480217154525, 0.27367730380496647, 0.8866478145458545 ] ] Var3: [ [ 0.2459443412735529, 0.6211893868708748, 0.49500739584280073 ] ] >> writer = arrow.io.csv.TableWriter("example.csv") writer = TableWriter with properties: Filename: "example.csv" >> writer.write(arrowTableWrite) >> reader = arrow.io.csv.TableReader("example.csv") reader = TableReader with properties: Filename: "example.csv" >> arrowTableRead = reader.read() arrowTableRead = Var1: double Var2: double Var3: double ---- Var1: [ [ 0.9113083542736461, 0.5131490075412158, 0.42942202968065213 ] ] Var2: [ [ 0.09159480217154525, 0.27367730380496647, 0.8866478145458545 ] ] Var3: [ [ 0.2459443412735529, 0.6211893868708748, 0.49500739584280073 ] ] >> matlabTableRead = table(arrowTableRead) matlabTableRead = 3×3 table Var1 Var2 Var3 _______ ________ _______ 0.91131 0.091595 0.24594 0.51315 0.27368 0.62119 0.42942 0.88665 0.49501 >> isequal(arrowTableRead, arrowTableWrite) ans = logical 1 >> isequal(matlabTableRead, matlabTableWrite) ans = logical 1 ``` ### Are these changes tested? Yes. 1. Added new CSV I/O tests including `test/arrow/io/csv/tRoundTrip.m` and `test/arrow/io/csv/tError.m`. 2. Both of these test classes inherit from a `CSVTest` superclass. ### Are there any user-facing changes? Yes. 1. Users can now read and write CSV files using `arrow.io.csv.TableReader` and `arrow.io.csv.TableWriter`. ### Future Directions 1. Expose [options](https://github.com/apache/arrow/blob/main/cpp/src/arrow/csv/options.h) for controlling CSV reading and writing in MATLAB. 2. Add more read/write tests for null value handling and other datatypes beyond numeric and string values. 4. Add a `RecordBatchReader` and `RecordBatchWriter` for CSV. 5. Add support for more I/O formats like Parquet, JSON, ORC, Arrow IPC, etc. ### Notes 1. Thank you @ sgilmore10 for your help with this pull request! 2. I chose to add both the `TableReader` and `TableWriter` in one pull request because it simplified testing. My apologies for the slightly lengthy pull request. * Closes: apache#37770 Lead-authored-by: Kevin Gurney <kgurney@mathworks.com> Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com> Signed-off-by: Kevin Gurney <kgurney@mathworks.com>

kevingurney requested a review from kou as a code owner September 18, 2023 15:57

github-actionsBot added Component: MATLAB awaiting committer review Awaiting committer review labels Sep 18, 2023

kevingurney force-pushed the GH-37770 branch from 928f9c9 to bedaf98Compare September 18, 2023 16:01

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GH-37532: [CI][Docs][MATLAB] Remove GoogleTest support from the CMake build system for the MATLAB interface #37784
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kevingurney force-pushed the GH-37770 branch from a6055fb to 5149465Compare September 19, 2023 20:13

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kevingurneyand others added 17 commits September 20, 2023 14:14

Delete old Feather code for Writer properties.
a01ffa1

1. Rename arrow.io.csv.Writer to arrow.io.csv.TableWriter.
7140b6d
2. Change `write` method to take in an `arrow.tabular.Table`, rather than an `arrow.tabular.RecordBatch`. 3. Add basic implementation of `arrow.io.csv.TableReader` class. Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com>

Add basic CSV round-trip tests.
12b4f31
Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com>

Use default values for read, write, parse, and convert options for CSV.
9c88a9f

1. Parameterize CSV tests.
b1a5c5c
2. Create CSV test superclass. 3. Add tError test class. Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com>

Add verifyRoundTrip method to CSVTest class.
58a5ea3

Remove unused TestMethodSetup block in tError.
934e9ad

1. Update arguments block type properties for TableReader and TableWr…
356e2ea
…iter filename argument. 2. Add basic error tests for TableReader and TableWriter. Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com>

1. Set access for Filename property of TableWriter.
54179e2
2. Add more error tests. Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com>

Enable Arrow CSV functionality with -D ARROW_CSV=ON in MATLAB CI wo…
6a5126c
…rkflow script. Co-authored-by: Sarah Gilmore <sgilmore@mathworks.com>

Enable ARROW_CSV in ExternalProject_Add call.
35aefb4

Enable ARROW_CSV component in ExternalProject_Add call.
b3fb5dc

Fix CMake linting errors.
a843a8d

Use auto for declaring options in TableReader::read.
67d9ff9

Use auto keyword when initializing output stream in TableWriter.
73deaa6

Use auto keyword when declaring WriteOptions.
ecf2bee

Mark output_stream as const.
aea2f39

kevingurney force-pushed the GH-37770 branch from cdaa51a to aea2f39Compare September 20, 2023 18:14

kevingurney merged commit 2b34e37 into apache:mainSep 20, 2023

kevingurney deleted the GH-37770 branch September 20, 2023 18:31

kevingurney removed the awaiting change review Awaiting change review label Sep 20, 2023

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