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[SPARK-21985][PYSPARK] PairDeserializer is broken for double-zipped RDDs
## What changes were proposed in this pull request? (edited) Fixes a bug introduced in apache#16121 In PairDeserializer convert each batch of keys and values to lists (if they do not have `__len__` already) so that we can check that they are the same size. Normally they already are lists so this should not have a performance impact, but this is needed when repeated `zip`'s are done. ## How was this patch tested? Additional unit test Author: Andrew Ray <ray.andrew@gmail.com> Closes apache#19226 from aray/SPARK-21985.
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