nseekhao commented on PR #7612:
URL: 
https://github.com/apache/arrow-datafusion/pull/7612#issuecomment-1751439292

   @alamb I extracted the predicate splits from the `from_substrait_rel()` so 
the code is easier to read. Unfortunately, I couldn't use the function 
`split_eq_and_noneq_join_predicate()` (from your 
[ref](https://docs.rs/datafusion/latest/datafusion/optimizer/extract_equijoin_predicate/struct.ExtractEquijoinPredicate.html))
 directly because the function will put the equal condition with 
`nulls_equal_nulls = true` (`IsNotDistinctFrom`) into a join filter, as opposed 
to putting it in the join condition.
   
   As for the test, I added a test function to be used when join has a non-equi 
condition, to ensure that the join filter does not mistakenly get embedded into 
a Substrait plan as a `post_join_filter`. LMK if this is what you had in mind, 
otherwise we can discuss further changes. Thanks for the review!
   


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