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[SPARK-9858][SPARK-9859][SPARK-9861][SQL] Add an ExchangeCoordinator to estimate the number of post-shuffle partitions for aggregates and joins #9276

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[SPARK-9858][SPARK-9859][SPARK-9861][SQL] Add an ExchangeCoordinator to estimate the number of post-shuffle partitions for aggregates and joins #9276

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