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https://issues.apache.org/jira/browse/CALCITE-7832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18121363#comment-18121363
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Mihai Budiu commented on CALCITE-7832:
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The Calcite Runtime actually drops NULL values from ARRAY_AGG. If this is the
intended semantics, this issue is invalid. The documentation does not specify
the semantics, but neither Postgres nor BigQuery drop NULLs.
> AggregateCaseToFilterRule should not be applied to ARRAY_AGG
> ------------------------------------------------------------
>
> Key: CALCITE-7832
> URL: https://issues.apache.org/jira/browse/CALCITE-7832
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.42.0
> Reporter: Mihai Budiu
> Assignee: Mihai Budiu
> Priority: Minor
>
> CALCITE-7330 handles this for user-defined aggregates. But the same
> reasoning is valid for ARRAY_AGG, which does *not* ignore NULLs.
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