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https://issues.apache.org/jira/browse/CALCITE-2455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16572653#comment-16572653
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Yuzhao Chen commented on CALCITE-2455:
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Hi [~julianhyde]
I have fired a PR: https://github.com/apache/calcite/pull/782
> 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
> Priority: Major
> 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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