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Posted to issues@flink.apache.org by "Francesco Guardiani (Jira)" <ji...@apache.org> on 2022/03/21 13:46:00 UTC

[jira] [Assigned] (FLINK-26764) Support RESPECT NULLS for FIRST_VALUE/LAST_VALUE

     [ https://issues.apache.org/jira/browse/FLINK-26764?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Francesco Guardiani reassigned FLINK-26764:
-------------------------------------------

    Assignee: luoyuxia

> Support RESPECT  NULLS for FIRST_VALUE/LAST_VALUE
> -------------------------------------------------
>
>                 Key: FLINK-26764
>                 URL: https://issues.apache.org/jira/browse/FLINK-26764
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table SQL / API, Table SQL / Planner
>            Reporter: luoyuxia
>            Assignee: luoyuxia
>            Priority: Major
>             Fix For: 1.16.0
>
>
> Flink supports fucntion FIRST_VALUE/LAST_VALUE, but the behavior is always ignore null value.
> But the [Spark|https://spark.apache.org/docs/2.4.2/api/sql/index.html#first_value], [Hive|https://cwiki.apache.org/confluence/display/hive/languagemanual+windowingandanalytics], [Oracle|https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions057.htm], [Snowflake|https://docs.snowflake.com/en/sql-reference/functions/first_value.html], etc, also support to respect null for FIRST_VALUE/LAST_VALUE.
> Should we also support to allow users to specifc whether to ignore null?



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