Prasanth Jayachandran created HIVE-15771:
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Summary: CBO chooses wrong join order for TPC-DS query72
Key: HIVE-15771
URL: https://issues.apache.org/jira/browse/HIVE-15771
Project: Hive
Issue Type: Bug
Components: CBO
Affects Versions: 2.2.0
Reporter: Prasanth Jayachandran
Priority: Critical
Query72 of TPC-DS on 1TB scale generates wrong join order resulting in
increased query execution time. It chooses fact-to-fact table join followed by
joins with dimension tables as opposed to doing map-join with dimension tables
first and doing the fact-to-fact table join at the last.
Please find attachment for the join order selected by CBO vs rewritten query
with correct join order.
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