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https://issues.apache.org/jira/browse/CALCITE-5013?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jiajun Xie resolved CALCITE-5013.
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Resolution: Later
> Unparse SqlSetOperator should be retained parentheses when generating SQL
> for UNION ... LIMIT
> ----------------------------------------------------------------------------------------------
>
> 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.
> For simple example, parentheses control the scope of the limit
> {code:java}
> select "product_id" from "product"
> union all
> (select "product_id" from "product" limit 10){code}
> unparseBinarySyntax will miss parentheses, this change will affect semantics
> {code:java}
> SELECT \"product_id\" FROM \"foodmart\".\"product\"
> UNION ALL
> SELECT \"product_id\" FROM \"foodmart\".\"product\"
> FETCH NEXT 10 ROWS ONLY -- Affect semantics{code}
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