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Posted to commits@calcite.apache.org by GitBox <gi...@apache.org> on 2020/02/07 19:10:06 UTC

[GitHub] [calcite] hsyuan commented on issue #1740: [CALCITE-3713] Remove column names from Project#digest

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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