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https://issues.apache.org/jira/browse/CALCITE-3852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17057637#comment-17057637
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Zoltan Haindrich commented on CALCITE-3852:
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it would be better to rewrite it to {{AND(null,x is null)}} because in most
cases we are in unknownAsFalse mode;
making broader simplification could enable other parts of RexSimplify to
continue on with simplifying.....
> 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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