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https://issues.apache.org/jira/browse/CALCITE-4562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17313564#comment-17313564
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Aleksey Plekhanov commented on CALCITE-4562:
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[~julianhyde], I'd like to help with fixing this issue. How can I assign it to
myself?
> Improve simplification of "expression IS TRUE"
> ----------------------------------------------
>
> Key: CALCITE-4562
> URL: https://issues.apache.org/jira/browse/CALCITE-4562
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Priority: Major
>
> When simplifying "expression IS TRUE", RexSimplify should simplify
> "expression" in an "unknown as FALSE" context, and this should allow more
> simplifications than at present.
> Currently "(x LIKE '%') IS TRUE" simplifies to "(x IS NOT NULL) IS TRUE", but
> after this change will simplify to "x IS NOT NULL". The following test
> illustrates:
> {code}
> final RexNode ref = input(tVarchar(true, 10), 0);
> checkSimplify(isTrue(like(ref, literal("%"))), "IS NOT NULL($0)");
> {code}
> Similarly "IS FALSE", "IS NOT TRUE", etc.
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