Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/8647#discussion_r39213684
--- Diff: python/pyspark/sql/column.py ---
@@ -341,7 +343,30 @@ def cast(self, dataType):
raise TypeError("unexpected type: %s" % type(dataType))
return Column(jc)
- astype = cast
+ @ignore_unicode_prefix
+ @since(1.3)
+ def astype(self, dataType):
+ """ Convert the column into type ``dataType``.
+
+ >>> df.select(df.age.astype("string").alias('ages')).collect()
+ [Row(ages=u'2'), Row(ages=u'5')]
+ >>> df.select(df.age.astype(StringType()).alias('ages')).collect()
+ [Row(ages=u'2'), Row(ages=u'5')]
+
+ (Note : astype is alias for cast)
+ """
+ if isinstance(dataType, basestring):
+ jc = self._jc.astype(dataType)
+ elif isinstance(dataType, DataType):
+ sc = SparkContext._active_spark_context
+ ssql_ctx = sc._jvm.SQLContext(sc._jsc.sc())
+ jdt = ssql_ctx.parseDataType(dataType.json())
+ jc = self._jc.astype(jdt)
+ else:
+ raise TypeError("unexpected type: %s" % type(dataType))
+ return Column(jc)
+
+ # astype = cast
--- End diff --
remove this
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