[GitHub] [arrow-datafusion] jiangzhx commented on pull request #5907: optimize non-correlated where exists subquery rewrite to scalar subquery

["jiangzhx (via GitHub)" <gi...@apache.org>]

jiangzhx commented on PR #5907:
URL: https://github.com/apache/arrow-datafusion/pull/5907#issuecomment-1513429846

   > @jiangzhx Why not add a new `SubQueryExec` for all the uncorrelated subqueries? Since we will need this for those subqueries that can not be de-correlated. I remember this was a similar PR for the purpose, but that PR was not merged or it was in someone's personal branch.
   
   @mingmwang  Thank you very much for your response. Adding a SubQueryExec can solve many subquery scenarios. If this issue is not urgent, I would like to try working on it, even though I don't have much experience in this area.


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