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-451241778 @hvanhovell >From a cursory search I could also see that ProjectExec does something similar, and that is not covered by this PR. Ahh.. good catch. My search did not include a parameter name, e.g. the x in ```map(x =>```, since many just use underscore.
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