Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/8647#discussion_r38910982
--- Diff: python/pyspark/sql/column.py ---
@@ -329,6 +329,8 @@ def cast(self, dataType):
[Row(ages=u'2'), Row(ages=u'5')]
>>> df.select(df.age.cast(StringType()).alias('ages')).collect()
[Row(ages=u'2'), Row(ages=u'5')]
+
+ (Note : astype is alias for cast)
--- End diff --
I think @marmbrus also suggested that cast docs be updated to note the
alias the other way -- there may be two more changes to make.
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