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Posted to issues@spark.apache.org by "jiaan.geng (Jira)" <ji...@apache.org> on 2020/02/04 10:16:00 UTC

[jira] [Commented] (SPARK-30727) ANSI SQL: LAST_VALUE function

    [ https://issues.apache.org/jira/browse/SPARK-30727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17029721#comment-17029721 ] 

jiaan.geng commented on SPARK-30727:
------------------------------------

I'm working on.

> ANSI SQL: LAST_VALUE function
> -----------------------------
>
>                 Key: SPARK-30727
>                 URL: https://issues.apache.org/jira/browse/SPARK-30727
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: jiaan.geng
>            Priority: Major
>
> I have checked PostgreSQL, Vertica, Oracle, Redshift, Presto, Teradata, FIRST_VALUE|LAST_VALUE is always used as a window function, not as an aggregate function.
> The FIRST_VALUE function currently provided can be used as both an aggregation function and a window function.
> Maybe we need to re-implement it.



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