HyukjinKwon commented on issue #23882: [SPARK-26979][PySpark] Add missing column name support for some SQL functions URL: https://github.com/apache/spark/pull/23882#issuecomment-469101570 Also, please clarify _why_ we should add string as columns in Python side as well. Scala has `$"..."` pattern. Python has `df["..."]` and `df...`. I don't think they are relevant - string can be supported via `df["col"]` as well already. The only reason I agree to add them is it needs smaller change comparing to Scala side.
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