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https://issues.apache.org/jira/browse/SPARK-31561?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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L. C. Hsieh resolved SPARK-31561.
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Fix Version/s: 4.2.0
Resolution: Fixed
Issue resolved by pull request 55401
[https://github.com/apache/spark/pull/55401]
> Add QUALIFY Clause
> ------------------
>
> Key: SPARK-31561
> URL: https://issues.apache.org/jira/browse/SPARK-31561
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Yuming Wang
> Assignee: L. C. Hsieh
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.2.0
>
>
> In a SELECT statement, the QUALIFY clause filters the results of window
> functions.
> QUALIFY does with window functions what HAVING does with aggregate functions
> and GROUP BY clauses.
> In the execution order of a query, QUALIFY is therefore evaluated after
> window functions are computed.
> Examples:
> https://docs.snowflake.com/en/sql-reference/constructs/qualify.html#examples
> More details:
> https://docs.snowflake.com/en/sql-reference/constructs/qualify.html
> https://docs.teradata.com/reader/2_MC9vCtAJRlKle2Rpb0mA/19NnI91neorAi7LX6SJXBw
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