bersprockets commented on issue #23392: [SPARK-26450][SQL] Avoid rebuilding map of schema for every column in projection URL: https://github.com/apache/spark/pull/23392#issuecomment-450441648 @hvanhovell There are other places that use this pattern: InterpretedProjection InterpretedOrdering HashAggregateExec FileFormatWriter HashJoin SortMergeJoinExec GenerateSafeProjection GenerateOrdering GenerateMutableProjection However, I don't know if any are in a "hot" path.
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