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https://issues.apache.org/jira/browse/CALCITE-5125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17532768#comment-17532768
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Dmitry Sysolyatin commented on CALCITE-5125:
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I didn't plan to implement all of them, only the first case
> Extend "||" operator to work with arrays
> ----------------------------------------
>
> Key: CALCITE-5125
> URL: https://issues.apache.org/jira/browse/CALCITE-5125
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Dmitry Sysolyatin
> Assignee: Dmitry Sysolyatin
> Priority: Major
> Labels: pull-request-available
>
> "||" operator can be used only for string concatenation but it would be good
> to use it also for array concatenation as PostgreSQL
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