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https://issues.apache.org/jira/browse/PHOENIX-671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14276212#comment-14276212
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James Taylor commented on PHOENIX-671:
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FWIW, filtering out duplicates would not be too difficult since the results
from each separate query would be already sorted on row key. You'd just need to
create a new iterator, DedupResultIterator, similar to
BaseGroupedAggregatingResultIterator, which does a merge sort between the
tuples from each iterator for each separate query, filtering out rows that are
the same. This DedupResultIterator would replace the ConcatIterator mentioned
above.
> Support UNION
> -------------
>
> Key: PHOENIX-671
> URL: https://issues.apache.org/jira/browse/PHOENIX-671
> Project: Phoenix
> Issue Type: Task
> Reporter: James Taylor
> Assignee: Alicia Ying Shu
>
> This is particularly useful for Pentaho support.
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