Chang chen created KYLIN-3656:
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Summary: Improve HLLCounter performance
Key: KYLIN-3656
URL: https://issues.apache.org/jira/browse/KYLIN-3656
Project: Kylin
Issue Type: Improvement
Affects Versions: all
Reporter: Chang chen
The current HLLCounter implementation has some room to improve performance, as
we find in our product environment.
# Create HLLCounter from another HLLCounter, we can copy register instead of
merge
# To compute harmonic mean in the HLLCSnapshot, we could
## using table to cache all 1/2^r without computing on the fly
## remove floating addition by using integer addition in the bigger loop
## remove branch, e.g. needn't checking whether registers[i] is zero or not,
although this is minor improvement.
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