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https://issues.apache.org/jira/browse/CALCITE-3852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17057584#comment-17057584
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Chunwei Lei commented on CALCITE-3852:
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Thanks for your reply, [~kgyrtkirk]. I am wondering it really benefits if we
simplify x!=9 to {{null and x is null}} given x=9 and x is nullable. So I only
do the simplification when x is not nullable.
> RexSimplify doesn't simplify NOT EQUAL predicates
> -------------------------------------------------
>
> Key: CALCITE-3852
> URL: https://issues.apache.org/jira/browse/CALCITE-3852
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Chunwei Lei
> Assignee: Chunwei Lei
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Given x=9, RexSimplify does not simplify x != 9 to false.
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