Remus Rusanu created HIVE-16358:
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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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