xndai edited a comment on issue #1740: [CALCITE-3713] Remove column names from Project#digest URL: https://github.com/apache/calcite/pull/1740#issuecomment-584911960 >Every time we create a new RelType we build stings. Every time we create RelNode we build strings. Every time we create RexNode we build strings. Yes, but if not string, you would be creating something else. I am fine with the initial overhead. But we cannot afford recomputing hash code every time when access the map. Unfortunately this is what `List<RelDataType>` does with your change.
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