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https://issues.apache.org/jira/browse/CALCITE-600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14326680#comment-14326680
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Vladimir Sitnikov commented on CALCITE-600:
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[~jcamachorodriguez], can you please clarify who creates HiveUnion?
Can't you perform basic optimizations in {{Logical*}} relations?
{quote}HiveUnion operator that extends Union. I would like to use the
UnionMerge rule in Hive. Without this extension, the only solution is to extend
the rule and rewrite the match (and possibly transform{quote}
I do not follow you. UnionMergeRule operates on LogicalUnions. Eventually those
LogicalUnions lower to HiveUnion.
It will not fire for HiveUnion unless your HiveUnion extends LogicalUnion
(however I see little sense in it).
> 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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