HyukjinKwon commented on issue #23882: [SPARK-26979][PYTHON] Add missing string column name support for some SQL functions URL: https://github.com/apache/spark/pull/23882#issuecomment-474138133 I already explained the reasons to revert. If we see some ambiguity, we should consider not supporting string as columns officially, or such discussion should be concluded. It's confusing what string means in the PySpark function because it has two semantically different meaning here.
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