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Posted to dev@calcite.apache.org by "Thomas Rebele (Jira)" <ji...@apache.org> on 2022/03/23 15:05:00 UTC

[jira] [Created] (CALCITE-5061) Improve recursive application of the field trimming

Thomas Rebele created CALCITE-5061:
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             Summary: Improve recursive application of the field trimming
                 Key: CALCITE-5061
                 URL: https://issues.apache.org/jira/browse/CALCITE-5061
             Project: Calcite
          Issue Type: Improvement
            Reporter: Thomas Rebele
            Assignee: Thomas Rebele
             Fix For: 1.31.0


The RelFieldTrimmer has some shortcomings:
 * If the plan contains certain set ops (e.g., UNION(all=false)), even if the operator needs all fields for the correct result (CALCITE-3399), it may still make sense to apply the trimming to the children. See CALCITE-5051 for an example.
 * Same applies for a Sort with dynamic parameters in the fetch/offset, and RepeatUnions
 * The makeZeroLiteral logic in trimChildRestore(...) does not work for ARRAY / Java types.



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