Ruben Q L created CALCITE-6488:
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Summary: Ensure collations created by RelCollations are canonized
once
Key: CALCITE-6488
URL: https://issues.apache.org/jira/browse/CALCITE-6488
Project: Calcite
Issue Type: Task
Components: core
Affects Versions: 1.37.0
Reporter: Ruben Q L
Fix For: 1.38.0
RelCollations#of canonizes internally the result before returning it; however
some callers unnecessarily re-canonize the result on their end.
RelCollations#shift does not canonize its result, some callers canonize on
their end while others don't.
It is proposed to align their behaviour: RelCollations#of and
RelCollations#shift will canonize internally their results before return, so
that their callers do not need to do it on their end.
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