beliefer commented on issue #25082: [SPARK-28310][SQL] Support (FIRST_VALUE|LAST_VALUE)(expr[ (IGNORE|RESPECT) NULLS]?) syntax URL: https://github.com/apache/spark/pull/25082#issuecomment-581796519 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. cc @gatorsmile @cloud-fan @dongjoon-hyun @wangyum
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