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https://issues.apache.org/jira/browse/IMPALA-10835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17391081#comment-17391081
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Fucun Chu commented on IMPALA-10835:
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Perf comparison doc:
https://docs.google.com/spreadsheets/d/1Vr67cm7ALxOmgaZeo5hMIfvbIGG0ALPILb5rcHqeAGA/edit?usp=sharing
> Extend the ds_hll_sketch() function to accept a precision
> ---------------------------------------------------------
>
> Key: IMPALA-10835
> URL: https://issues.apache.org/jira/browse/IMPALA-10835
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Fucun Chu
> Assignee: Fucun Chu
> Priority: Major
>
> Like [IMPALA-2658|https://issues.apache.org/jira/browse/IMPALA-2658], an
> optional parameter is added to solve the limitation of the precision of the
> ds_hll_sketch function.
> {code:java}
> DS_HLL_SKETCH(expression [, precision])
> {code}
> The precision value must be between 4 and 21. The default is 12.
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