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https://issues.apache.org/jira/browse/CALCITE-816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641884#comment-14641884
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Julian Hyde commented on CALCITE-816:
-------------------------------------
When this issue is fixed, see whether the following are fixed: CALCITE-551,
CALCITE-365, CALCITE-709, CALCITE-297.
> 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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