sarahyurick commented on issue #6432:
URL: 
https://github.com/apache/arrow-datafusion/issues/6432#issuecomment-1568775136

   Thanks @mingmwang ! Knowing which rule/variable to look at is helpful. I'm 
still not able to see the `IS NOT NULL` filters though, even when I verbosely 
initialize with `let config = OptimizerContext::new().filter_null_keys(true);`.
   
   Is it possible that `IS NOT NULL` isn't being added because it's a `Inner 
Join:  Filter: d_table.d_col = c_table.c_col` instead of a `Inner Join: 
c_table.c_col= d_table.d_col`?


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