darcy-shen commented on a change in pull request #32332:
URL: https://github.com/apache/spark/pull/32332#discussion_r679575072
##########
File path: python/pyspark/sql/session.py
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@@ -697,12 +712,17 @@ def prepare(obj):
verify_func(obj)
return obj,
else:
+ no_need_to_prepare = True
prepare = lambda obj: obj
if isinstance(data, RDD):
- rdd, schema = self._createFromRDD(data.map(prepare), schema,
samplingRatio)
+ rdd, schema = self._createFromRDD(
+ data if no_need_to_prepare else data.map(prepare),
Review comment:
There are cases when verifySchema is True and the `prepare` function is
the identity function.
That's why we need the `no_need_to_prepare` flag.
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