[SPARK-21985][PYTHON] Fix zip-chained RDD to work #19228
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Test build #81753 has finished for PR 19228 at commit
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What changes were proposed in this pull request?
This PR proposes to return an iterator of lists (batches) of objects in
CartesianDeserializerandPairDeserializerrather than an iterator of iterators (batches) of objects so thatzipchaining works.How was this patch tested?
Unit tests added.