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https://issues.apache.org/jira/browse/CALCITE-4007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17110728#comment-17110728
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Haisheng Yuan commented on CALCITE-4007:
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Yes, I agree.
> MergeJoin collation check should not be limited to join key's order
> -------------------------------------------------------------------
>
> Key: CALCITE-4007
> URL: https://issues.apache.org/jira/browse/CALCITE-4007
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Priority: Minor
>
> Given MergeJoin on foo.a=bar.a and foo.b=bar.b,
> The collation check on MergeJoin always require it is sorted by (a,b), but
> after 1.23.0 calcite can generate MergeJoin on collation of (b,a), or even
> (a,b,c), (b,a,c), which are all legit. We should relax the check condition.
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