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https://issues.apache.org/jira/browse/CALCITE-600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14326531#comment-14326531
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Vladimir Sitnikov commented on CALCITE-600:
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I thought the point of using {{Logical*}} was to stick with a single
implementation and reuse rules.
What is the use case?
> 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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