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https://issues.apache.org/jira/browse/CALCITE-3473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16985866#comment-16985866
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Wang Yanlin commented on CALCITE-3473:
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We should add a check in RelMdUniqueKeys.getUniqueKeys for TableScan.
> Getting unique result for table scan should contain key column(s)
> -----------------------------------------------------------------
>
> Key: CALCITE-3473
> URL: https://issues.apache.org/jira/browse/CALCITE-3473
> Project: Calcite
> Issue Type: Improvement
> Reporter: Wang Yanlin
> Assignee: Wang Yanlin
> Priority: Major
> Labels: pull-request-available
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Currently, *mq.getUniqueKeys()* for *TableScan* returns empty.
> However, for table with key column(s) defined, we can refer uniqueness on key
> column(s), so the result should contain key column(s)
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