Github user Stibbons commented on a diff in the pull request:
https://github.com/apache/spark/pull/14918#discussion_r77174813
--- Diff: python/pyspark/sql/session.py ---
@@ -373,16 +375,16 @@ def _createFromRDD(self, rdd, schema, samplingRatio):
rdd = rdd.map(schema.toInternal)
return rdd, schema
- def _createFromLocal(self, data, schema):
+ def _createFromLocal(self, prepareFunc, data, schema):
"""
Create an RDD for DataFrame from a list or pandas.DataFrame,
returns
the RDD and schema.
"""
- # make sure data could consumed multiple times
- if not isinstance(data, list):
- data = list(data)
if schema is None or isinstance(schema, (list, tuple)):
+ # make sure data could consumed multiple times
+ if not isinstance(data, list):
--- End diff --
here we can convert to list because there will be several iterations on the
data
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