Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/16537#discussion_r124004237
--- Diff: python/pyspark/sql/functions.py ---
@@ -1949,6 +1949,14 @@ def _create_judf(self):
return judf
def __call__(self, *cols):
+ for c in cols:
+ if not isinstance(c, (Column, str)):
--- End diff --
Doesn't this break `unicode` support in Python 2?
```python
from pyspark.sql.functions import udf
udf(lambda x: x)(u"a")
```
before
```
Column<<lambda>(a)>
```
after
```
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File ".../spark/python/pyspark/sql/functions.py", line 1970, in wrapper
return self(*args)
File ".../spark/python/pyspark/sql/functions.py", line 1958, in __call__
"lit, array, struct or create_map.".format(c, type(c)))
TypeError: Invalid UDF argument, not a str or Column: a of type <type
'unicode'>. For Column literals use sql.functions lit, array, struct or
create_map.
```
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