xudong963 opened a new issue #1209:
URL: https://github.com/apache/arrow-datafusion/issues/1209


   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   support more subqueries and pass the TPCH associated with the subquery: 
https://github.com/apache/arrow-datafusion/issues?q=is%3Aopen+is%3Aissue+milestone%3ATPC-H
   
   **Describe the solution you'd like**
   
   - [ ] `WHERE EXISTS (SELECT ...)`
   - [ ] `SELECT (subquery) AS x` or `WHERE (subquery) = x`
   - [ ] `[ NOT ] IN (SELECT ...)`
   - [ ] `<expr> <op> ANY/SOME (<query>)`
   - [ ] `<expr> <op> ALL (<query>)`
   - [ ] Single-Row Comparison
   
   **Describe alternatives you've considered**
   Correlated subqueries will be implemented by nested loop initially. After 
the realization of basic functions, we can do some optimization, such as 
decorrelation and so on.
   
   **Additional context**
   Add any other context or screenshots about the feature request here.
   
   


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