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[SPARK-7060][SQL] Add alias function to python dataframe #5634

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[SPARK-7060][SQL] Add alias function to python dataframe #5634

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14 changes: 14 additions & 0 deletions python/pyspark/sql/dataframe.py
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Original file line number Diff line number Diff line change
Expand Up @@ -452,6 +452,20 @@ def columns(self):
"""
return [f.name for f in self.schema.fields]

@ignore_unicode_prefix
def alias(self, alias):
"""Returns a new :class:`DataFrame` with an alias set.

>>> from pyspark.sql.functions import *
>>> df_as1 = df.alias("df_as1")
>>> df_as2 = df.alias("df_as2")
>>> joined_df = df_as1.join(df_as2, col("df_as1.name") == col("df_as2.name"), 'inner')
>>> joined_df.select(col("df_as1.name"), col("df_as2.name"), col("df_as2.age")).collect()
[Row(name=u'Alice', name=u'Alice', age=2), Row(name=u'Bob', name=u'Bob', age=5)]
"""
assert isinstance(alias, basestring), "alias should be a string"
return DataFrame(getattr(self._jdf, "as")(alias), self.sql_ctx)

@ignore_unicode_prefix
def join(self, other, joinExprs=None, joinType=None):
"""Joins with another :class:`DataFrame`, using the given join expression.
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