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Posted to dev@calcite.apache.org by "Ruben Q L (Jira)" <ji...@apache.org> on 2020/08/26 14:06:00 UTC

[jira] [Created] (CALCITE-4195) Cast from character to character with a different collator is not monotonic

Ruben Q L created CALCITE-4195:
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             Summary: Cast from character to character with a different collator is not monotonic
                 Key: CALCITE-4195
                 URL: https://issues.apache.org/jira/browse/CALCITE-4195
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.24.0
            Reporter: Ruben Q L
             Fix For: 1.26.0


Problem related to the feature CALCITE-3951.

A cast operation from a character type to another character type that has a different collator must be evaluated as not monotonic. Currently this is not the case.
This has an impact e.g. in SortProjectTransposeRule, since we can incorrectly transpose a sort after a projection than contains such a cast, and we end up with a plan that will return a different result than the original one.




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