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From "Remus Rusanu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-16358) Push TOP N to Druid queries
Date Mon, 03 Apr 2017 16:25:41 GMT
Remus Rusanu created HIVE-16358:
-----------------------------------

             Summary: Push TOP N to Druid queries
                 Key: HIVE-16358
                 URL: https://issues.apache.org/jira/browse/HIVE-16358
             Project: Hive
          Issue Type: Improvement
          Components: Query Planning, Query Processor
            Reporter: Remus Rusanu
            Assignee: Remus Rusanu


After HIVE-15708 promotes Calcite to 1.12, {{TOP N}} queries over Druid tables will be implemented
by GroupBy on Druid and then (sort and) Limit on Hive. The relevant changes on Calcite side
are related to CALCITE-1578 and steam from fundamental semantic differences between Druid
concept of TOP (ie. top within a GBy) vs. SQL TOP/LIMIT (ie. global).



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