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Posted to issues@calcite.apache.org by "jin xing (Jira)" <ji...@apache.org> on 2019/10/11 05:24:00 UTC
[jira] [Created] (CALCITE-3399) RelFieldTrimmer trim fields for
UNION, INTERSECT, INTERSECT ALL, EXCEPT, EXCEPT ALL
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 forĀ UNION, UNION ALL, INTERSECT, INTERSECT ALL, EXCEPT, EXCEPT ALL;
ButĀ 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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