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https://issues.apache.org/jira/browse/CALCITE-4010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Feng Zhu reassigned CALCITE-4010:
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Assignee: Feng Zhu
> Revise codegen for EnumerableMergeJoin to accept any sort order
> ---------------------------------------------------------------
>
> Key: CALCITE-4010
> URL: https://issues.apache.org/jira/browse/CALCITE-4010
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Assignee: Feng Zhu
> Priority: Major
>
> Given MergeJoin on foo.a=bar.a and foo.b=bar.b,
> The codegen for EnumerableMergeJoin always sort tuples by ascending order,
> nulls last, but after 1.23.0 calcite can generate MergeJoin on collation of
> (b,a), or even (a,b,c), (b,a,c), with any asc/desc, null direction, which are
> all legit. So the codegen should sort tuples exactly according to the
> requirement of collation.
> See
> https://github.com/apache/calcite/blob/master/linq4j/src/main/java/org/apache/calcite/linq4j/EnumerableDefaults.java#L1966
> and
> https://github.com/apache/calcite/pull/1833#discussion_r384445110
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