dongjoon-hyun opened a new pull request #27458: Revert "[SPARK-28310][SQL] Support (FIRST_VALUE|LAST_VALUE)(expr[ (IGNORE|RESPECT) NULLS]?) syntax" URL: https://github.com/apache/spark/pull/27458 ### What changes were proposed in this pull request? This reverts commit b89c3de1a439ed7302dd8f44c49b89bb7da2eebe. ### Why are the changes needed? `FIRST_VALUE` is used only for window expression. ### Does this PR introduce any user-facing change? Yes. ### How was this patch tested? Pass the Jenkins.
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