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[jira] [Created] (CALCITE-2455) Fix simplifyCoalesce of constant when nullability missing


Yuzhao Chen created CALCITE-2455:
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             Summary: Fix simplifyCoalesce of constant when nullability missing
                 Key: CALCITE-2455
                 URL: https://issues.apache.org/jira/browse/CALCITE-2455
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.17.0
            Reporter: Yuzhao Chen
            Assignee: Julian Hyde
             Fix For: 1.18.0


After CALCITE-2227, we will not replace Coalesce to Case When for natural join, when we use ReduceExpressionRule for our plan for Coalesce with constant, the nullability will chage( from nullable to notnull), this will cause VolcanoPlanner to throw error.

Should i fix this? or we should not use this rule in VolcanoPlanner?



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