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https://issues.apache.org/jira/browse/CALCITE-600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14326691#comment-14326691
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Vladimir Sitnikov commented on CALCITE-600:
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Using "rule for arbitrary subclass" is a sloppy way.
Consider this: SemiJoin extends Join.
In fact, not all the rules that work for Join will work for SemiJoin (there is
explicit "if not instanceof SemiJoin" test).
The same might apply for other nodes.
> Create UnionFactory and use in rules containing Union operator
> --------------------------------------------------------------
>
> Key: CALCITE-600
> URL: https://issues.apache.org/jira/browse/CALCITE-600
> Project: Calcite
> Issue Type: Bug
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
>
> Union related rules match on {{LogicalUnion}} and use this implementation to
> create the new Union operators. As it is done for other rules, a Union
> factory can be created and used by them, so subclasses that extend Union can
> use the rules.
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