Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/8444#discussion_r38018765
--- Diff: python/pyspark/sql/readwriter.py ---
@@ -125,23 +131,33 @@ def load(self, path=None, format=None, schema=None,
**options):
@since(1.4)
def json(self, path, schema=None):
"""
- Loads a JSON file (one object per line) and returns the result as
- a :class`DataFrame`.
+ Loads a JSON file (one object per line) or an RDD of Strings
storing JSON objects
+ (one object per record) and returns the result as a
:class`DataFrame`.
If the ``schema`` parameter is not specified, this function goes
through the input once to determine the input schema.
- :param path: string, path to the JSON dataset.
+ :param path: string represents path to the JSON dataset,
+ or RDD of Strings storing JSON objects.
:param schema: an optional :class:`StructType` for the input
schema.
- >>> df =
sqlContext.read.json('python/test_support/sql/people.json')
- >>> df.dtypes
+ >>> df1 =
sqlContext.read.json('python/test_support/sql/people.json')
+ >>> df1.dtypes
+ [('age', 'bigint'), ('name', 'string')]
+ >>> rdd = sc.textFile('python/test_support/sql/people.json')
+ >>> df2 = sqlContext.read.json(rdd)
+ >>> df2.dtypes
[('age', 'bigint'), ('name', 'string')]
"""
if schema is not None:
self.schema(schema)
- return self._df(self._jreader.json(path))
+ if isinstance(path, basestring):
+ return self._df(self._jreader.json(path))
+ elif isinstance(path, RDD):
+ return self._df(self._jreader.json(path._jrdd))
+ else:
+ raise Exception("path can be only string or RDD")
--- End diff --
+1
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