Jesus Camacho Rodriguez created HIVE-22549:
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Summary: RS deduplication should not merge final aggregation
without keys
Key: HIVE-22549
URL: https://issues.apache.org/jira/browse/HIVE-22549
Project: Hive
Issue Type: Bug
Components: Physical Optimizer
Reporter: Jesus Camacho Rodriguez
Assignee: Jesus Camacho Rodriguez
This may lead to performance degradation. For instance, this can happen for the
following query:
{code}
set hive.support.concurrency=true;
set hive.txn.manager=org.apache.hadoop.hive.ql.lockmgr.DbTxnManager;
EXPLAIN
CREATE TABLE x STORED AS ORC TBLPROPERTIES('transactional'='true') AS
SELECT * FROM SRC x CLUSTER BY x.key;
{code}
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