vlsi opened a new pull request #1740: [CALCITE-3713] Remove column names from Project#digest URL: https://github.com/apache/calcite/pull/1740 Projects that differ with column names only are equivalent, so the planning space can be reduced if field names do not participate in relation matching. For instance, `Project(input=rel#1,empid=$0)` and `Project(input=rel#1,deptno=$0)` are equivalent under the new digest approach.
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