HyukjinKwon edited a comment on issue #23879: [SPARK-26979][SQL] Add missing 
column name support for SQL functions
URL: https://github.com/apache/spark/pull/23879#issuecomment-466766672
 
 
   These generics are only applied to `functions.py`. Can you then whitelist 
one by one?
   
   I at least see one more instance, `trim` by `_create_function`. Also, there 
are few exceptions like `from_json` that takes `schema` as `Column` but also 
`DataType`. Plus, we should make it consistent in `dataframe.py` as well.
   
   `Column` and string are completely different types. It's not iterable or 
something related with duck-typing. See `help(max)` in Python.

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