Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21383#discussion_r191623502
--- Diff: python/pyspark/util.py ---
@@ -55,7 +55,9 @@ def _get_argspec(f):
"""
# `getargspec` is deprecated since python3.0 (incompatible with
function annotations).
# See SPARK-23569.
- if sys.version_info[0] < 3:
+ if hasattr(f, '_argspec'):
--- End diff --
Yea, the current way sounds a hack .. let's document this although we have
a plan to clean this up soon.
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