Github user Stibbons commented on a diff in the pull request:
https://github.com/apache/spark/pull/14918#discussion_r77174714
--- Diff: python/pyspark/sql/session.py ---
@@ -396,14 +398,18 @@ def _createFromLocal(self, data, schema):
raise TypeError("schema should be StructType or list or None,
but got: %s" % schema)
# convert python objects to sql data
- data = [schema.toInternal(row) for row in data]
+ if prepareFunc is not None:
+ data = [schema.toInternal(prepareFunc(row)) for row in data]
+ else:
+ data = [schema.toInternal(row) for row in data]
--- End diff --
in this case we avoided the call to ```map(prepare, data)``` when prepare
is the identity function
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