[jira] [Commented] (CALCITE-7678) Runtime equality for ROW values produces incorrect results

["Julian Hyde (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-7678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18099586#comment-18099586 ] 

Julian Hyde commented on CALCITE-7678:
--------------------------------------

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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