AdamGS opened a new pull request, #22981:
URL: https://github.com/apache/datafusion/pull/22981

   ## Which issue does this PR close?
   
   - Part of https://github.com/apache/datafusion/issues/21309
   
   ## Rationale for this change
   
   Taken out of #21585 to make it easier to review.
   
   ## What changes are included in this PR?
   
   Adds `null_aware_mark_join.slt` file that includes many examples of queries 
using null-aware mark joins. I've collected them both from other existing 
tests, the [`Story of Join (in 
HyPer)`](https://www.cs.cmu.edu/~15721-f24/papers/Story_of_Joins.pdf) paper and 
some help from Codex.
   
   These tests currently pass as they ensure the wrong behavior. Once the 
original PR (or parts of it) get merged, more tests can be changed to assert 
the correct behavior.
   
   ## Are these changes tested?
   
   Verified locally
   
   ## Are there any user-facing changes?
   
   No
   


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