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https://issues.apache.org/jira/browse/CALCITE-6723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17904321#comment-17904321
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Mihai Budiu commented on CALCITE-6723:
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I see this bug has actually been fixed, but I wasn't looking at the latest main.
> Type inference for ARRAY_INSERT function is incorrect
> -----------------------------------------------------
>
> Key: CALCITE-6723
> URL: https://issues.apache.org/jira/browse/CALCITE-6723
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.38.0
> Reporter: Mihai Budiu
> Assignee: Mihai Budiu
> Priority: Minor
>
> The type inference is implemented in
> SqlLibraryOperators.arrayInsertReturnType.
> This function computes the return type as a function of the types of
> arguments 0 and 2.
> However, if argument 1 is nullable, the result type has to be nullable as
> well.
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