guojidan commented on issue #8970:
URL: 
https://github.com/apache/arrow-datafusion/issues/8970#issuecomment-1909270453

   tasks: 
   - [ ] early stage simplification like expr IN () --> false, null IN/NOT IN
   - [ ] convert long OR chain or AND chain to InList expressions like what 
or_in_list_simplifier does
   - [ ] shorten InList expressions like what inlist_simplifier in this PR does
   - [ ] convert final inlist to OR chain or AND chain if len < 3. Move inlist 
related simplifier out from expr_simplifier


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