athlcode commented on PR #22100:
URL: https://github.com/apache/datafusion/pull/22100#issuecomment-4452014200

   > Thanks @athlcode my bad, I just realized I haven't clarified tests needs 
to be added to `slt` file, lets remove rust tests unless they are not 
reproducible with `slt`. Ideally to create a separate `.slt` file for 
`explode_outer` to localize tests
   
   None of the test cases are currently reproducible via SLT because there's no 
SQL surface for NullHandling::PreserveAndExpandEmpty. To enable SLT coverage we 
need to add SQL recognition of explode_outer(col) (and probably explode(col) 
for symmetry) and map them to UNNEST with the right NullHandling variant.


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