metamx/druid — pull request #528 by nishantmonu51 (2014-05-01 15:53:48+00:00)
Title: Union query source

Add support for UnionDataSource where union of results from multiple datasources can be calculated.

Queries that support Union - TimeSeries, TopN, GroupBy, select, search
Queries that DONT support Union - TimeBoundary, SegmentMetadataQuery