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https://issues.apache.org/jira/browse/CALCITE-7105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18009814#comment-18009814
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Zhen Chen commented on CALCITE-7105:
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I did look at this PR, but I didn't fully understand it, so I didn't leave any
comments. We can thank [~cancai] for the review.
> ARRAY_CONCAT should only accept arguments with type ARRAY
> ---------------------------------------------------------
>
> Key: CALCITE-7105
> URL: https://issues.apache.org/jira/browse/CALCITE-7105
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.40.0
> Reporter: Mihai Budiu
> Assignee: Mihai Budiu
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.41.0
>
>
> The following SqlOperatorTest will pass successfully:
> {code}
> f.checkScalar("array_concat('a')", "a", "CHAR(1) NOT NULL");
> {code}
> The spec requires the arguments to have array types.
>
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