Github user davies commented on the pull request:
https://github.com/apache/spark/pull/4808#issuecomment-76478450
@JoshRosen Because we serialized the objects in batch, and pickle memorize
the multiple occurrences of same object in the batch, finally we will get
single DataType object (even for StructType), we can benefits from this
optimization, no `__hash__` and `__eq__` for later row in the batch.
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