[ 
https://issues.apache.org/jira/browse/CALCITE-816?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Julian Hyde reassigned CALCITE-816:
-----------------------------------

    Assignee: Julian Hyde  (was: Vladimir Sitnikov)

[~vlsi], I'm taking this back because I'm actively working on this. See 
https://github.com/julianhyde/calcite/commits/816-sub-query. What work did you 
want to do on this?

> 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
>             Fix For: 1.6.0
>
>
> 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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