asmello commented on issue #23882: [SPARK-26979][PySpark][WIP] Add missing 
column name support for some SQL functions
URL: https://github.com/apache/spark/pull/23882#issuecomment-468950427
 
 
   Alright, as noted in the commit, I've restored the original exceptions to be 
handled by the mechanism, and handled these separately:
   
   - lit()
   - col()
   - column()
   - asc()
   - desc()
   - asc_nulls_first()
   - asc_nulls_last()
   - desc_nulls_first()
   - desc_nulls_last()
   
   The original mechanism has been renamed and applied those only. The new 
mechanism is consistent with how most functions are handled outside the 
mechanism - it converts the argument to a Column object by default.

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