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https://issues.apache.org/jira/browse/CALCITE-3993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17106623#comment-17106623
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Haisheng Yuan commented on CALCITE-3993:
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It just adds the method. I didn't use the API in the code.
> Add isDefault(), keys(), keyBits() to RelTrait interface
> --------------------------------------------------------
>
> Key: CALCITE-3993
> URL: https://issues.apache.org/jira/browse/CALCITE-3993
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
>
> It is an extremely frequent usage to check whether the distribution is
> default (ANY), the collation is default (EMPTY).
> Also add the following to RelDistribution and RelCollation
> {code:java}
> ImmutableIntList getKeys();
> ImmutableBitSet getKeysBits();
> {code}
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