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https://issues.apache.org/jira/browse/CALCITE-6723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17904851#comment-17904851
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Caican Cai commented on CALCITE-6723:
-------------------------------------
Perhaps other spark array functions have similar problems.
> 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
> Labels: pull-request-available
> Fix For: 1.39.0
>
>
> The type inference is implemented in
> SqlLibraryOperators.arrayInsertReturnType.
> Since the spec of the function says that "if the index is larger than the
> array, the array is padded with NULL values", it implies that the type of the
> result is always an array with nullable elements, irrespective of the type of
> the elements of the input array.
> Currently the type inference preserves the element type in the result.
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