[SPARK-25979][SQL] Window function: allow parentheses around window reference by gengliangwang · Pull Request #22987 · apache/spark

gengliangwang · 2018-11-08T16:23:29Z

What changes were proposed in this pull request?

Very minor parser bug, but possibly problematic for code-generated queries:

Consider the following two queries:

SELECT avg(k) OVER (w) FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER BY 1

and

SELECT avg(k) OVER w FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER BY 1

The former, with parens around the OVER condition, fails to parse while the latter, without parens, succeeds:

Error in SQL statement: ParseException: 
mismatched input '(' expecting {<EOF>, ',', 'FROM', 'WHERE', 'GROUP', 'ORDER', 'HAVING', 'LIMIT', 'LATERAL', 'WINDOW', 'UNION', 'EXCEPT', 'MINUS', 'INTERSECT', 'SORT', 'CLUSTER', 'DISTRIBUTE'}(line 1, pos 19)

== SQL ==
SELECT avg(k) OVER (w) FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER BY 1
-------------------^^^

This was found when running the cockroach DB tests.

I tried PostgreSQL, The SQL with parentheses is also workable.

How was this patch tested?

Unit test

gengliangwang · 2018-11-08T16:25:48Z


  import testImplicits._

+  val empSalaryData = Seq(


The table and data here is from: https://www.postgresql.org/docs/9.1/tutorial-window.html

The naming and data is easier to be understood. In case we need to compare more behavior, we can use this one as alternative.
I can use the WindowData and remove this as well.

can we just add a new test in window.sql?

We really just need a simple test that proves over (w) works.

gengliangwang · 2018-11-08T16:30:39Z

@gatorsmile @cloud-fan

SparkQA · 2018-11-08T19:57:42Z

Test build #98611 has finished for PR 22987 at commit c9d01df.

This patch passes all tests.
This patch merges cleanly.
This patch adds the following public classes (experimental):
case class EmpSalary(empno: Int, depname: String, salary: Double)

cloud-fan · 2018-11-09T03:37:31Z

+SELECT cate, sum(val) OVER (w)
+FROM testData
+WHERE val is not null
+WINDOW w AS (PARTITION BY cate ORDER BY val);


need a new line at the end.

gatorsmile · 2018-11-09T03:53:22Z

LGTM

SparkQA · 2018-11-09T05:33:28Z

Test build #98633 has finished for PR 22987 at commit 2da6f99.

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

SparkQA · 2018-11-09T07:54:12Z

Test build #98636 has finished for PR 22987 at commit 471092d.

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

…eference ## What changes were proposed in this pull request? Very minor parser bug, but possibly problematic for code-generated queries: Consider the following two queries: ``` SELECT avg(k) OVER (w) FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER BY 1 ``` and ``` SELECT avg(k) OVER w FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER BY 1 ``` The former, with parens around the OVER condition, fails to parse while the latter, without parens, succeeds: ``` Error in SQL statement: ParseException: mismatched input '(' expecting {<EOF>, ',', 'FROM', 'WHERE', 'GROUP', 'ORDER', 'HAVING', 'LIMIT', 'LATERAL', 'WINDOW', 'UNION', 'EXCEPT', 'MINUS', 'INTERSECT', 'SORT', 'CLUSTER', 'DISTRIBUTE'}(line 1, pos 19) == SQL == SELECT avg(k) OVER (w) FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER BY 1 -------------------^^^ ``` This was found when running the cockroach DB tests. I tried PostgreSQL, The SQL with parentheses is also workable. ## How was this patch tested? Unit test Closes #22987 from gengliangwang/windowParentheses. Authored-by: Gengliang Wang <gengliang.wang@databricks.com> Signed-off-by: gatorsmile <gatorsmile@gmail.com> (cherry picked from commit 1db7997) Signed-off-by: gatorsmile <gatorsmile@gmail.com>

gatorsmile · 2018-11-09T17:46:43Z

LGTM

Thanks! Merged to master.

I accidentally merged it to 2.4. Feel free to revert it if anybody has a concern about this fix.

dongjoon-hyun · 2018-11-10T00:08:50Z

Thanks. Technically, since it's categorized as a BUG, I'm +1 to have this in branch-2.4 as a syntax bug fix.

…eference ## What changes were proposed in this pull request? Very minor parser bug, but possibly problematic for code-generated queries: Consider the following two queries: ``` SELECT avg(k) OVER (w) FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER BY 1 ``` and ``` SELECT avg(k) OVER w FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER BY 1 ``` The former, with parens around the OVER condition, fails to parse while the latter, without parens, succeeds: ``` Error in SQL statement: ParseException: mismatched input '(' expecting {<EOF>, ',', 'FROM', 'WHERE', 'GROUP', 'ORDER', 'HAVING', 'LIMIT', 'LATERAL', 'WINDOW', 'UNION', 'EXCEPT', 'MINUS', 'INTERSECT', 'SORT', 'CLUSTER', 'DISTRIBUTE'}(line 1, pos 19) == SQL == SELECT avg(k) OVER (w) FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER BY 1 -------------------^^^ ``` This was found when running the cockroach DB tests. I tried PostgreSQL, The SQL with parentheses is also workable. ## How was this patch tested? Unit test Closes apache#22987 from gengliangwang/windowParentheses. Authored-by: Gengliang Wang <gengliang.wang@databricks.com> Signed-off-by: gatorsmile <gatorsmile@gmail.com>

…eference ## What changes were proposed in this pull request? Very minor parser bug, but possibly problematic for code-generated queries: Consider the following two queries: ``` SELECT avg(k) OVER (w) FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER BY 1 ``` and ``` SELECT avg(k) OVER w FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER BY 1 ``` The former, with parens around the OVER condition, fails to parse while the latter, without parens, succeeds: ``` Error in SQL statement: ParseException: mismatched input '(' expecting {<EOF>, ',', 'FROM', 'WHERE', 'GROUP', 'ORDER', 'HAVING', 'LIMIT', 'LATERAL', 'WINDOW', 'UNION', 'EXCEPT', 'MINUS', 'INTERSECT', 'SORT', 'CLUSTER', 'DISTRIBUTE'}(line 1, pos 19) == SQL == SELECT avg(k) OVER (w) FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER BY 1 -------------------^^^ ``` This was found when running the cockroach DB tests. I tried PostgreSQL, The SQL with parentheses is also workable. ## How was this patch tested? Unit test Closes apache#22987 from gengliangwang/windowParentheses. Authored-by: Gengliang Wang <gengliang.wang@databricks.com> Signed-off-by: gatorsmile <gatorsmile@gmail.com> (cherry picked from commit 1db7997) Signed-off-by: gatorsmile <gatorsmile@gmail.com>

fix

c9d01df

gengliangwang commented Nov 8, 2018

View reviewed changes

use window.sql for testing

2da6f99

cloud-fan reviewed Nov 9, 2018

View reviewed changes

cloud-fan approved these changes Nov 9, 2018

View reviewed changes

add newline

471092d

asfgit closed this in 1db7997 Nov 9, 2018

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[SPARK-25979][SQL] Window function: allow parentheses around window reference#22987

[SPARK-25979][SQL] Window function: allow parentheses around window reference#22987
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gengliangwang commented Nov 8, 2018

What changes were proposed in this pull request?

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