[SPARK-31146][SQL] Leverage the helper method for aliasing in built-in SQL expressions by HyukjinKwon · Pull Request #27901 · apache/spark

HyukjinKwon · 2020-03-13T09:07:14Z

What changes were proposed in this pull request?

This PR is kind of a followup of #26808. It leverages the helper method for aliasing in built-in SQL expressions to use the alias as its output column name where it's applicable.

Expression, UnaryMathExpression and BinaryMathExpression search the alias in the tags by default.
When the naming is different in its implementation, it has to be overwritten for the expression specifically. E.g., CallMethodViaReflection, Remainder, CurrentTimestamp,
FormatString and XPathDouble.

This PR fixes the aliases of the functions below:

class	alias
`Rand`	`random`
`Ceil`	`ceiling`
`Remainder`	`mod`
`Pow`	`pow`
`Signum`	`sign`
`Chr`	`char`
`Length`	`char_length`
`Length`	`character_length`
`FormatString`	`printf`
`Substring`	`substr`
`Upper`	`ucase`
`XPathDouble`	`xpath_number`
`DayOfMonth`	`day`
`CurrentTimestamp`	`now`
`Size`	`cardinality`
`Sha1`	`sha`
`CallMethodViaReflection`	`java_method`

Note: EqualTo, = and == aliases were excluded because it's unable to leverage this helper method. It should fix the parser.

Note: this PR also excludes some instances such as ToDegrees, ToRadians, UnaryMinus and UnaryPositive that needs an explicit name overwritten to make the scope of this PR smaller.

Why are the changes needed?

To respect expression name.

Does this PR introduce any user-facing change?

Yes, it will change the output column name.

How was this patch tested?

Manually tested, and unittests were added.

dongjoon-hyun · 2020-03-13T19:22:24Z

Retest this please.

dongjoon-hyun · 2020-03-13T19:34:52Z

 select ln(1.2345678e-28)
 -- !query schema
-struct<LOG(1.2345678E-28):double>
+struct<log(1.2345678E-28):double>


Can we have ln instead of log?

I actually realised that there are some more instances such as ToDegrees, ToRadians, UnaryMinus and UnaryPositive.. let me exclude these to make the scope my PR addresses smaller

dongjoon-hyun · 2020-03-14T00:10:36Z

Oh, R failure is relevant one.

test_sparkSQL.R:1785: failure: column binary mathfunctions
collect(select(df, atan2(df$a, df$b)))[1, "ATAN2(a, b)"] not equal to atan2(1, 5).
target is NULL, current is numeric

maropu · 2020-03-14T07:26:19Z

Looks nice. For easy trackability in commit logs, could you add a list of the functions (that this PR adds alias flags for) in the PR description?

HyukjinKwon · 2020-03-15T05:19:21Z

cc @cloud-fan too - I realised that you touched lots of codes related to this during commit history search.

HyukjinKwon · 2020-03-15T07:16:15Z

retest this please

SparkQA · 2020-03-15T11:23:08Z

Test build #119813 has finished for PR 27901 at commit b3f40a1.

This patch passes all tests.
This patch merges cleanly.
This patch adds no public classes.

viirya

If users code refers the output column name, will such change break user code? Should we update migration guide too?

HyukjinKwon · 2020-03-16T01:47:58Z

I don't think we have made guarantee on the output column name. Also, I would think this is as a rather bug fix. We have already made such changes a lot in the history.

dongjoon-hyun

+1, LGTM. Thank you, @HyukjinKwon and all.
Merged to master/3.0.

…n SQL expressions ### What changes were proposed in this pull request? This PR is kind of a followup of #26808. It leverages the helper method for aliasing in built-in SQL expressions to use the alias as its output column name where it's applicable. - `Expression`, `UnaryMathExpression` and `BinaryMathExpression` search the alias in the tags by default. - When the naming is different in its implementation, it has to be overwritten for the expression specifically. E.g., `CallMethodViaReflection`, `Remainder`, `CurrentTimestamp`, `FormatString` and `XPathDouble`. This PR fixes the aliases of the functions below: | class | alias | |--------------------------|------------------| |`Rand` |`random` | |`Ceil` |`ceiling` | |`Remainder` |`mod` | |`Pow` |`pow` | |`Signum` |`sign` | |`Chr` |`char` | |`Length` |`char_length` | |`Length` |`character_length`| |`FormatString` |`printf` | |`Substring` |`substr` | |`Upper` |`ucase` | |`XPathDouble` |`xpath_number` | |`DayOfMonth` |`day` | |`CurrentTimestamp` |`now` | |`Size` |`cardinality` | |`Sha1` |`sha` | |`CallMethodViaReflection` |`java_method` | Note: `EqualTo`, `=` and `==` aliases were excluded because it's unable to leverage this helper method. It should fix the parser. Note: this PR also excludes some instances such as `ToDegrees`, `ToRadians`, `UnaryMinus` and `UnaryPositive` that needs an explicit name overwritten to make the scope of this PR smaller. ### Why are the changes needed? To respect expression name. ### Does this PR introduce any user-facing change? Yes, it will change the output column name. ### How was this patch tested? Manually tested, and unittests were added. Closes#27901 from HyukjinKwon/31146. Authored-by: HyukjinKwon <gurwls223@apache.org> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org> (cherry picked from commit 6704103) Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

HyukjinKwon · 2020-03-17T01:13:25Z

Thank you guys!

gatorsmile · 2020-03-31T21:05:58Z

We need to update the migration guide. This impacts the output schema of SQL queries.

HyukjinKwon · 2020-04-01T01:16:46Z

~~Sure~~. I am sorry, I rushed to read. I think we haven't documented such output column names in the migration so far, e.g., #26808. Let me leave it out for now.

HyukjinKwon · 2020-04-01T03:23:46Z

And I think we don't also guarantee on output columns names (#27901 (comment)).

…n SQL expressions ### What changes were proposed in this pull request? This PR is kind of a followup of apache#26808. It leverages the helper method for aliasing in built-in SQL expressions to use the alias as its output column name where it's applicable. - `Expression`, `UnaryMathExpression` and `BinaryMathExpression` search the alias in the tags by default. - When the naming is different in its implementation, it has to be overwritten for the expression specifically. E.g., `CallMethodViaReflection`, `Remainder`, `CurrentTimestamp`, `FormatString` and `XPathDouble`. This PR fixes the aliases of the functions below: | class | alias | |--------------------------|------------------| |`Rand` |`random` | |`Ceil` |`ceiling` | |`Remainder` |`mod` | |`Pow` |`pow` | |`Signum` |`sign` | |`Chr` |`char` | |`Length` |`char_length` | |`Length` |`character_length`| |`FormatString` |`printf` | |`Substring` |`substr` | |`Upper` |`ucase` | |`XPathDouble` |`xpath_number` | |`DayOfMonth` |`day` | |`CurrentTimestamp` |`now` | |`Size` |`cardinality` | |`Sha1` |`sha` | |`CallMethodViaReflection` |`java_method` | Note: `EqualTo`, `=` and `==` aliases were excluded because it's unable to leverage this helper method. It should fix the parser. Note: this PR also excludes some instances such as `ToDegrees`, `ToRadians`, `UnaryMinus` and `UnaryPositive` that needs an explicit name overwritten to make the scope of this PR smaller. ### Why are the changes needed? To respect expression name. ### Does this PR introduce any user-facing change? Yes, it will change the output column name. ### How was this patch tested? Manually tested, and unittests were added. Closesapache#27901 from HyukjinKwon/31146. Authored-by: HyukjinKwon <gurwls223@apache.org> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

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HyukjinKwon changed the title ~~[SPARK-31146][SQL] Leverage the helper method for aliasing in all SQL expressions~~ [SPARK-31146][SQL] Leverage the helper method for aliasing in built-in SQL expressions Mar 13, 2020

Leverage the helper method for aliasing in all SQL expressions
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HyukjinKwon force-pushed the 31146 branch from 536b747 to 0809771Compare March 13, 2020 12:06

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dongjoon-hyun added the SQL label Mar 13, 2020

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Comment threadsql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala

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Comment threadsql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala Outdated

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gatorsmile reviewed Mar 15, 2020
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Comment threadsql/core/src/test/resources/sql-tests/results/postgreSQL/float8.sql.out Outdated

HyukjinKwon added 2 commits March 15, 2020 14:01

Address comments
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Remove unused imports
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viirya reviewed Mar 15, 2020
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Comment thread...alyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/CallMethodViaReflection.scala

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cloud-fan reviewed Mar 16, 2020
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Comment thread...alyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/CallMethodViaReflection.scala

cloud-fan approved these changes Mar 16, 2020
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dongjoon-hyun approved these changes Mar 16, 2020
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dongjoon-hyun closed this in 6704103Mar 16, 2020

HyukjinKwon deleted the 31146 branch July 27, 2020 07:45

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