Haisheng Yuan created CALCITE-4010:
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Summary: 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
Given MergeJoin on foo.a=bar.a and foo.b=bar.b,
The codegen for EnumerableMergeJoin always sort tuples by (a,b), 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
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