[jira] [Created] (FLINK-28484) UniqueKey inference should respect the semantics of null as well as consider the possibility of precision loss from implicit conversions

Mon, 11 Jul 2022 00:05:10 -0700 

lincoln lee created FLINK-28484:
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             Summary: UniqueKey inference should respect the semantics of null 
as well as consider the possibility of precision loss from implicit conversions
                 Key: FLINK-28484
                 URL: https://issues.apache.org/jira/browse/FLINK-28484
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
    Affects Versions: 1.15.1
            Reporter: lincoln lee


FLINK-15313 introduces a new branch in UniqueKey inference of projection, but 
does not respect the semantics of null and does not consider the possible loss 
of precision due to implicit conversion, which may lead to a wrong 
determination of whether a column is unique or not, and consequently to a wrong 
execution plan.



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