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https://issues.apache.org/jira/browse/CALCITE-7656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18096349#comment-18096349
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Mihai Budiu commented on CALCITE-7656:
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Same problem for COVAR_SAMP
> Result type inferred for VAR_SAMP is incorrect
> ----------------------------------------------
>
> Key: CALCITE-7656
> URL: https://issues.apache.org/jira/browse/CALCITE-7656
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.42.0
> Reporter: Mihai Budiu
> Assignee: Mihai Budiu
> Priority: Minor
>
> The result should be always nullable, since VAR_SAMP of a 1-element
> collection is NULL, but it's not.
> This is the same problem as CALCITE-6547
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