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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