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