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https://issues.apache.org/jira/browse/CALCITE-3643?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Sitnikov resolved CALCITE-3643.
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Resolution: Fixed
Fixed in
https://github.com/apache/calcite/commit/30bb98f0bb9a8576986764ace85c66714a2e4213
> Prevent matching JoinCommuteRule when both inputs are the same
> --------------------------------------------------------------
>
> Key: CALCITE-3643
> URL: https://issues.apache.org/jira/browse/CALCITE-3643
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Vladimir Sitnikov
> Assignee: Vladimir Sitnikov
> Priority: Major
> Fix For: 1.22.0
>
>
> The conditions like =($0, $1) and =($1, $1) are equivalent, however adding
> that permutation increases search space and it gains nothing.
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