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  1. Calcite
  2. CALCITE-3713

Remove column names from Project#digest

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      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

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              vladimirsitnikov Vladimir Sitnikov
              vladimirsitnikov Vladimir Sitnikov
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