hsyuan commented on issue #1740: [CALCITE-3713] Remove column names from Project#digest URL: https://github.com/apache/calcite/pull/1740#issuecomment-583559444 @vlsi It turns out this patch causes 20~30% overhead for HepPlanner. Because the hash map lookup in belongsToDag becomes much slower. The hashcode and equals for the list is not as efficient as the simple RelDataType.
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