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https://issues.apache.org/jira/browse/SPARK-25979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li resolved SPARK-25979.
-----------------------------
Resolution: Fixed
Assignee: Gengliang Wang
Fix Version/s: 3.0.0
2.4.1
> Window function: allow parentheses around window reference
> ----------------------------------------------------------
>
> Key: SPARK-25979
> URL: https://issues.apache.org/jira/browse/SPARK-25979
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Gengliang Wang
> Assignee: Gengliang Wang
> Priority: Minor
> Fix For: 2.4.1, 3.0.0
>
>
> Very minor parser bug, but possibly problematic for code-generated queries:
> Consider the following two queries:
> {code}
> SELECT avg(k) OVER (w) FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER
> BY 1
> {code}
> and
> {code}
> SELECT avg(k) OVER w FROM kv WINDOW w AS (PARTITION BY v ORDER BY w) ORDER BY
> 1
> {code}
> The former, with parens around the OVER condition, fails to parse while the
> latter, without parens, succeeds:
> {code}
> 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
> -------------------^^^
> {code}
> This was found when running the cockroach DB tests.
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