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Posted to issues@calcite.apache.org by "Julian Hyde (Jira)" <ji...@apache.org> on 2021/04/02 17:59:00 UTC
[jira] [Assigned] (CALCITE-4562) Improve simplification of
"expression IS TRUE"
[ https://issues.apache.org/jira/browse/CALCITE-4562?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Julian Hyde reassigned CALCITE-4562:
------------------------------------
Assignee: Julian Hyde
> 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
> Assignee: 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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