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https://issues.apache.org/jira/browse/CALCITE-7678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18100996#comment-18100996
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Julian Hyde commented on CALCITE-7678:
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I would write some tests of the corner cases and run them on Postgres. If my
expectations matched Postgres, that's good enough to lock that in as our
official behavior.
> Runtime equality for ROW values produces incorrect results
> ----------------------------------------------------------
>
> Key: CALCITE-7678
> URL: https://issues.apache.org/jira/browse/CALCITE-7678
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.42.0
> Reporter: Mihai Budiu
> Priority: Minor
>
> GROUP BY, DISTINCT, JOIN, UNION, etc by ROW-typed values produces incorrect
> results, because ROWs are compiled to Object[] and are compared by reference
> instead of being compared by value.
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