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Posted to dev@flink.apache.org by "luoyuxia (Jira)" <ji...@apache.org> on 2022/03/21 08:10:00 UTC

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

luoyuxia created FLINK-26764:
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             Summary: 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
             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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