GuangMing Lu created HIVE-25269:
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Summary: When the skew and parallel parameters are true
simultaneously, the result is less data
Key: HIVE-25269
URL: https://issues.apache.org/jira/browse/HIVE-25269
Project: Hive
Issue Type: Bug
Components: Physical Optimizer, SQL
Affects Versions: 3.1.2, 3.1.0
Reporter: GuangMing Lu
Attachments: table_a_data.orc, table_b_data.orc, table_c_data.orc,
table_d_data.orc, test.sql
When the params of hive.optimize.skewjoin, hive.groupby.skewindata and
hive.exec.parallel are true, and exec sql such as 'INSERT... FROM (SUBQUERY
UNIONALL ...GROUP BY...) A JOIN/LEFT JOIN A.expression', result data will be
reduced. Details of SQL and test data can be found in the attachment
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