[jira] [Commented] (SPARK-31561) Add QUALIFY Clause

["Yuming Wang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-31561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17186199#comment-17186199 ] 

Yuming Wang commented on SPARK-31561:
-------------------------------------

Note that we should forbid the following case:
{code:sql}
select * from tbl where fraud = 1 and row_number() over(partition by id order by eventtimestamp desc) =1
{code}


> Add QUALIFY Clause
> ------------------
>
>                 Key: SPARK-31561
>                 URL: https://issues.apache.org/jira/browse/SPARK-31561
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.1.0
>            Reporter: Yuming Wang
>            Priority: Major
>
> 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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