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https://issues.apache.org/jira/browse/CALCITE-816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14700146#comment-14700146
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Julian Hyde commented on CALCITE-816:
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I'll answer my own question... it's giving the wrong answer, so clearly not an
improvement.
> Represent sub-query as a RexNode
> --------------------------------
>
> Key: CALCITE-816
> URL: https://issues.apache.org/jira/browse/CALCITE-816
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
>
> Represent IN, NOT IN, EXISTS and scalar sub-queries as RexSubQuery extends
> RexNode. Then we can write a planner rule that expands sub-queries.
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