Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18106#discussion_r124329456
--- Diff: python/pyspark/sql/functions.py ---
@@ -1028,20 +1028,29 @@ def to_timestamp(col, format=None):
@since(1.5)
-def trunc(date, format):
+def trunc(data, truncParam):
--- End diff --
I believe this definitely breaks backward compatibility for
keyword-argument usage in Python.
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