asmello 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-473808930 > Why was `ascii` in string function an exception? Same reason as the other string functions; they were being defined using the automatic mechanism, which assumed the argument was either a Column object or a literal. So if it was a string (column name) and the Scala API didn't have an overload for that, it would fail.
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