Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/8647#discussion_r38949687
--- 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 --
The problem that I was referring to is exactly that the documentation is
repeated instead of being adapted for the function that is described. The code
examples for `astype` should use `astype` not `cast`.
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