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https://issues.apache.org/jira/browse/CALCITE-4021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-4021.
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Resolution: Won't Fix
> EnumerableUnion should preserve ordering when all inputs have the same
> collation
> --------------------------------------------------------------------------------
>
> Key: CALCITE-4021
> URL: https://issues.apache.org/jira/browse/CALCITE-4021
> Project: Calcite
> Issue Type: Improvement
> Reporter: Rui Wang
> Assignee: Rui Wang
> Priority: Major
>
> For query:
> {code:sql}
> select name from sales_dept
> union
> select name from it_dept
> order by mgr
> {code}
> We could generate a plan based on
> https://issues.apache.org/jira/browse/CALCITE-4017:
> {code:java}
> EnumerableUnion
> EnumerableProject
> EnumerableSort
> EnumerableTableScan[name="sales_dept"]
> EnumerableProject
> EnumerableSort
> EnumerableTableScan[name="it_dept"]
> {code}
> So EnumerableUnion should preserve ordering when all input have the same
> collation to make sure result of query is correct.
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