Gian Merlino 4cc39b2ee7 Alternative groupBy strategy. (#2998) ... This patch introduces a GroupByStrategy concept and two strategies: "v1" is the current groupBy strategy and "v2" is a new one. It also introduces a merge buffers concept in DruidProcessingModule, to try to better manage memory used for merging. Both of these are described in more detail in #2987. There are two goals of this patch: 1. Make it possible for historical/realtime nodes to return larger groupBy result sets, faster, with better memory management. 2. Make it possible for brokers to merge streams when there are no order-by columns, avoiding materialization. This patch does not do anything to help with memory management on the broker when there are order-by columns or when there are nested queries. That could potentially be done in a future patch.		2016-06-24 18:06:09 -07:00
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main	Adjust colliding aggregator cache IDs. (#2891)	2016-04-28 10:11:33 -07:00
test	Alternative groupBy strategy. (#2998)	2016-06-24 18:06:09 -07:00