Vineet Garg created HIVE-20842:
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Summary: Fix logic introduced in HIVE-20660 to estimate statistics
for group by
Key: HIVE-20842
URL: https://issues.apache.org/jira/browse/HIVE-20842
Project: Hive
Issue Type: Bug
Components: Statistics
Affects Versions: 4.0.0
Reporter: Vineet Garg
Assignee: Vineet Garg
HIVE-20660 introduced better estimation for group by operator. But the logic
did not account for Partial and Full group by separately.
For partial group by parallelism (i.e. number of tasks) should be taken into
account.
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