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https://issues.apache.org/jira/browse/CALCITE-7678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18099586#comment-18099586
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Julian Hyde commented on CALCITE-7678:
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Several of these operations ({{{}GROUP{}}}, {{{}DISTINCT{}}}, {{{}UNION{}}})
use {{IS NOT DISTINCT FROM}} rather than {{{}={}}}, so be sure to check that
too.
SQL's comparison semantics for {{ROW}} values are weird (especially where
foreign keys are concerned, and when some or all of the values of the {{ROW}}
are {{{}NULL{}}}) so be sure to check.
> 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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