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Hello,
Partitioning by column A could be advantageous in your use case and then groupBy column B in order to limit the number of partitions. You can create a dynamic frame and refer to partitions in it with predicate pushdown. Do you want to create multiple dynamic frames for multiple partitions and then combine them using join operator ? If you have any sample code you are using on a sample dataset, please share it with us on a support case and we can assist you by getting on a screen-share.
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