Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/13517#discussion_r65834648
--- Diff: python/pyspark/sql/readwriter.py ---
@@ -180,6 +180,9 @@ def json(self, path, schema=None,
primitivesAsString=None, prefersDecimal=None,
: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.
+ :param samplingRatio: sets the ratio for sampling and reading the
input data to infer
--- End diff --
it was actually intentional that samplingRatio was undocumented, because
regardless the value, Spark still needs to read all the data so this might as
well be 1 all the time.
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