Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/20390#discussion_r163933411
--- Diff: python/pyspark/sql/dataframe.py ---
@@ -819,6 +819,29 @@ def columns(self):
"""
return [f.name for f in self.schema.fields]
+ @since(2.4)
--- End diff --
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