[SPARK-7076][SPARK-7077][SPARK-7080][SQL] Use managed memory for aggregations by JoshRosen · Pull Request #5725 · apache/sparkThis patch adds managed-memory-based aggregation to Spark SQL / DataFrames. Instead of working with Java objects, this new aggregation path uses sun.misc.Unsafe to manipulate raw memory. This reduces the memory footprint for aggregations, resulting in fewer spills, OutOfMemoryErrors, and garbage collection pauses. As a result, this allows for higher memory utilization. It can also result in better
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