Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18732#discussion_r141775540
--- Diff: python/pyspark/sql/functions.py ---
@@ -2129,7 +2129,8 @@ def _create_udf(f, returnType, vectorized):
def _udf(f, returnType=StringType(), vectorized=vectorized):
if vectorized:
import inspect
- if len(inspect.getargspec(f).args) == 0:
+ argspec = inspect.getargspec(f)
+ if len(argspec.args) == 0 and argspec.varargs is None:
--- End diff --
BTW, let's address [this
comment](https://issues.apache.org/jira/browse/SPARK-21190?focusedCommentId=16185166&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16185166)
while we are here.
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