jiaan.geng created SPARK-30726:
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Summary: ANSI SQL: FIRST_VALUE function
Key: SPARK-30726
URL: https://issues.apache.org/jira/browse/SPARK-30726
Project: Spark
Issue Type: Sub-task
Components: SQL
Affects Versions: 3.0.0
Reporter: jiaan.geng
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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