Github user rdblue commented on a diff in the pull request:
https://github.com/apache/spark/pull/16537#discussion_r95484969
--- Diff: python/pyspark/sql/functions.py ---
@@ -1848,6 +1848,12 @@ def __del__(self):
self._broadcast = None
def __call__(self, *cols):
+ for c in cols:
+ if not isinstance(c, (Column, str)):
+ raise TypeError(
+ "All arguments should be Columns or strings
representing column names. "
--- End diff --
"All arguments" is a little vague, since this is going to be called later
in code than the UDF definition. What about an error message like "Invalid UDF
argument, not a String or Column: {0} of type {1}"
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