Vladimir Sitnikov created CALCITE-576:
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Summary: Make RelCollation trait and
AbstractRelNode.getCollationList consistent
Key: CALCITE-576
URL: https://issues.apache.org/jira/browse/CALCITE-576
Project: Calcite
Issue Type: Bug
Affects Versions: 1.0.0-incubating
Reporter: Vladimir Sitnikov
Assignee: Julian Hyde
Currently {{getCollationList}} is not consistent with {{RelCollation}} trait
since a node can have only one collation trait, thus you cannot express the
node that is sorted on multiple collations at the same time.
We should either drop {{getCollationList}} in favour of {{getCollation}} or
make collation trait support multiple "collation lists".
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