Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20390#discussion_r163721761
--- Diff: python/pyspark/sql/dataframe.py ---
@@ -1881,6 +1881,15 @@ def toDF(self, *cols):
jdf = self._jdf.toDF(self._jseq(cols))
return DataFrame(jdf, self.sql_ctx)
+ @since(2.3)
--- End diff --
I think this should be 2.4.
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