Prashant Prakash created KYLIN-1304:
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Summary: Incorrect count estimate upon
HyperLogLogPlusCounter.merge operation.
Key: KYLIN-1304
URL: https://issues.apache.org/jira/browse/KYLIN-1304
Project: Kylin
Issue Type: Bug
Affects Versions: v1.1.1
Reporter: Prashant Prakash
We are using hllc12 for evaluating uniques for a measure in a table partitioned
over date.
The uniques estimate for individual dates 2016-01-07, 2016-01-08, 2016-01-09
are 93,728,324, 90,982,364, 45,485,278 respectively.
But the uniques across days, which is calculated through
HyperLogLogPlusCounter.merge operation gives a incorrect value 67,980,576.
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