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https://issues.apache.org/jira/browse/CALCITE-576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14296315#comment-14296315
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Julian Hyde commented on CALCITE-576:
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I'm solving these very issues as part of CALCITE-526. If you do a merge join of
emp and dept both sorted on deptno, the output contain two deptno columns and
will be sorted on both.
> 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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