Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/12251#discussion_r60256563
--- Diff: python/pyspark/sql/types.py ---
@@ -507,20 +512,54 @@ def add(self, field, data_type=None, nullable=True,
metadata=None):
else:
data_type_f = data_type
self.fields.append(StructField(field, data_type_f, nullable,
metadata))
- self.names.append(field)
- self._needSerializeAnyField = any(f.needConversion() for f in
self.fields)
--- End diff --
This is used when unpickle, it's better to cache it.
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