tanelk opened a new pull request #34402:
URL: https://github.com/apache/spark/pull/34402


   ### What changes were proposed in this pull request?
   Enable using Exists/In subqueries in other nodes besides `Filter`. For 
example `Aggregate`, `Project`, `Window`, etc.
   This is allready mostly supported, but it was blocked in the `Analyzer`. 
Only requires a small tweak in the `Optimizer`.
   
   ### Why are the changes needed?
   One of the last open feature parities between PostgreSQL and Spark: 
[SPARK-30374](https://issues.apache.org/jira/browse/SPARK-30374)
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   ### How was this patch tested?
   Existing and new UTs
   


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