Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20716#discussion_r172023339
--- Diff: python/pyspark/sql/dataframe.py ---
@@ -892,6 +896,8 @@ def colRegex(self, colName):
def alias(self, alias):
"""Returns a new :class:`DataFrame` with an alias set.
+ :param alias: string, alias names to be set for the DataFrame.
--- End diff --
`alias names` -> `an alias name`
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