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https://issues.apache.org/jira/browse/CALCITE-7678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18101504#comment-18101504
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Mihai Budiu commented on CALCITE-7678:
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I personally think that some of the Postgres' choices are a mistake; this
business about "syntactic context" makes programs not composable.
If ROW(NULL) = ROW(NULL) evaluates to UNKNOWN, so should ROW(ROW(NULL)) =
ROW(ROW(NULL)). Moreover, the SQL standard agrees with this claim. I am
currently finalizing a PR which will agree with the standard in this respect.
> 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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