The "UNION ALL" operator can be used to fuse multiple queries together. Their results will be concatenated, and each query will run separately, back to back (not in parallel).
Related to #5473, but not strictly a fix for it, since this patch only adds support for "UNION ALL", not "UNION". The latter is tougher since it involves deduplication rather than mere concatenation. It might require a radically different approach (a native Druid query, perhaps). [ Full content available at: https://github.com/apache/incubator-druid/pull/6314 ] This message was relayed via gitbox.apache.org for [email protected]
