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Author SHA1 Message Date
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
Charles Allen 15ccf451f9 Move QueryGranularity static fields to QueryGranularities (#2980) 
* Move QueryGranularity static fields to QueryGranularityUtil
* Fixes #2979

* Add test showing #2979

* change name to QueryGranularities
 2016-05-17 16:23:48 -07:00
Gian Merlino 16080dc54f Adjust colliding aggregator cache IDs. (#2891) 
- Renumbered ApproximateHistogramAggregatorFactory from 8 to 12,
  8 was taken by CardinalityAggregatorFactory
- Renumbered ApproximateHistogramFoldingAggregatorFactory from 9 to 13,
  9 was taken by FilteredAggregatorFactory
 2016-04-28 10:11:33 -07:00
fjy e3e932a4d4 refactor extensions into core and contrib 2016-03-08 17:12:09 -08:00