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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