Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19630#discussion_r148957066
--- Diff: python/pyspark/sql/group.py ---
@@ -260,19 +259,19 @@ def wrapped(*cols):
import pandas as pd
result = func(pd.concat(cols, axis=1, keys=columns))
if not isinstance(result, pd.DataFrame):
- raise TypeError("Return type of the user-defined function
should be "
- "Pandas.DataFrame, but is
{}".format(type(result)))
+ raise TypeError('Return type of the user-defined function
should be '
--- End diff --
BTW, I think both `"` and `'` are fine. Let's avoid such changes here
unless there is a strong reason for it.
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