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https://issues.apache.org/jira/browse/FLINK-10488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16638097#comment-16638097
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Fabian Hueske commented on FLINK-10488:
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Yes, thanks for noticing!
> Add DISTINCT operator for streaming tables that leverages time attributes
> -------------------------------------------------------------------------
>
> Key: FLINK-10488
> URL: https://issues.apache.org/jira/browse/FLINK-10488
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Fabian Hueske
> Priority: Minor
>
> We can add a special DISTINCT operator that leverages time attributes and
> thereby avoids materializing the complete input table.
> This operator can also be used to evaluate UNION by rewriting UNION to UNION
> ALL + DISTINCT.
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