[jira] [Created] (CALCITE-3399) RelFieldTrimmer trim fields for UNION, INTERSECT, INTERSECT ALL, EXCEPT, EXCEPT ALL

[jin xing (Jira)]

jin xing created CALCITE-3399:
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             Summary: RelFieldTrimmer trim fields for UNION, INTERSECT, 
INTERSECT ALL, EXCEPT, EXCEPT ALL
                 Key: CALCITE-3399
                 URL: https://issues.apache.org/jira/browse/CALCITE-3399
             Project: Calcite
          Issue Type: Bug
          Components: core
            Reporter: jin xing
            Assignee: jin xing


RelFieldTrimmer#trimFields provides functionality to trim fields for  UNION, 
UNION ALL, INTERSECT, INTERSECT ALL, EXCEPT, EXCEPT ALL;

But UNION ALL, INTERSECT, INTERSECT ALL, EXCEPT, EXCEPT ALL works by checking 
duplication. Column pruning on inputs of SetOp might lead to different 
semantics.



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