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https://issues.apache.org/jira/browse/CALCITE-5013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17494955#comment-17494955
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Jiajun Xie commented on CALCITE-5013:
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Here is the pr:https://github.com/apache/calcite/pull/2724
> Parentheses should be retained when the operand of SetOp has limit or offset
> ----------------------------------------------------------------------------
>
> Key: CALCITE-5013
> URL: https://issues.apache.org/jira/browse/CALCITE-5013
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Jiajun Xie
> Priority: Major
>
> - In standard SQL, the operand of union should not have limit or order by.So
> parse will fail in SqlParserTetest#testLimitUnion and
> SqlParserTetest#OrderUnion.
> - When users use parentheses, most engines allow it. See the
> discussion:[CALCITE-1892|https://issues.apache.org/jira/browse/CALCITE-1892].
>
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