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Posted to issues@calcite.apache.org by "Vladimir Sitnikov (JIRA)" <ji...@apache.org> on 2015/01/28 09:18:34 UTC

[jira] [Created] (CALCITE-576) Make RelCollation trait and AbstractRelNode.getCollationList consistent

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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