Re: [I] General framework to decorrelate the subqueries [datafusion]

["mohammadnaqvi04 (via GitHub)" <gi...@apache.org>]

mohammadnaqvi04 commented on issue #5492:
URL: https://github.com/apache/datafusion/issues/5492#issuecomment-5934476405

   👋 I'm picking back up on this work as part of a directed study for my graduate degree. I put together a doc proposing a correctness target we can implement against which is essentially a catalog of query shapes that the current decorrelator gets wrong (either a hard failure or a plan that returns the wrong answer). This'll give any new implementation something to verify against as it grows.
   
   Plan doc: https://docs.google.com/document/d/1rZoOeiNcJw0OLSDgSqjA7PoA8cf2yAvU6Bc-4o4K4L4/edit?usp=sharing
   Shape catalog: https://docs.google.com/document/d/10dQRna0Dc8XBB74SkKbfKvPE1SvjNkXKMAcPeK8DiEw/edit?usp=sharing
   
   I'm working on a theoretical mapping from Neumann's paper to DataFusion's plan structures next. Would appreciate early feedback on the approach before I start building against it.
   


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