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https://issues.apache.org/jira/browse/HIVE-18079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479678#comment-16479678
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Prasanth Jayachandran commented on HIVE-18079:
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Minor change that is required for HIVE-19578. sparseMap access is replaced with
getSparseMap() which will return merged (sparseMap + tempList) sparse map with
HIVE-19578. This is required for the new tests to pass.
> Statistics: Allow HyperLogLog to be merged to the lowest-common-denominator
> bit-size
> ------------------------------------------------------------------------------------
>
> Key: HIVE-18079
> URL: https://issues.apache.org/jira/browse/HIVE-18079
> Project: Hive
> Issue Type: Improvement
> Components: Standalone Metastore, Statistics
> Affects Versions: 3.0.0
> Reporter: Gopal V
> Assignee: Prasanth Jayachandran
> Priority: Major
> Attachments: HIVE-18079-branch-3.patch, HIVE-18079-branch-3.patch,
> HIVE-18079-branch-3.patch, HIVE-18079.1.patch, HIVE-18079.10.patch,
> HIVE-18079.11.patch, HIVE-18079.12.patch, HIVE-18079.13.patch,
> HIVE-18079.14.patch, HIVE-18079.15.patch, HIVE-18079.15.patch,
> HIVE-18079.15.patch, HIVE-18079.16.patch, HIVE-18079.2.patch,
> HIVE-18079.4.patch, HIVE-18079.5.patch, HIVE-18079.6.patch,
> HIVE-18079.7.patch, HIVE-18079.8.patch, HIVE-18079.9.patch
>
>
> HyperLogLog can merge a 14 bit HLL into a 10 bit HLL bitset, because of its
> mathematical hash distribution & construction.
> Allow the squashing of a 14 bit HLL -> 10 bit HLL without needing a second
> scan over the data-set.
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