darcy-shen commented on a change in pull request #32332:
URL: https://github.com/apache/spark/pull/32332#discussion_r676401500



##########
File path: python/pyspark/sql/session.py
##########
@@ -478,13 +478,22 @@ def _inferSchema(self, rdd, samplingRatio=None, 
names=None):
             schema = rdd.map(lambda row: _infer_schema(row, 
names)).reduce(_merge_type)
         return schema
 
-    def _createFromRDD(self, rdd, schema, samplingRatio):
+    def _create_verified_converter(self, schema, verifySchema):
+        converter = _create_converter(schema)
+        verify_func = _make_type_verifier(schema) if verifySchema else lambda 
_: True
+
+        def verify_and_convert(obj):
+            verify_func(obj)

Review comment:
       In the latest commit, I've introduce a flag and avoid invoking the 
identity `prepare` function.




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