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https://issues.apache.org/jira/browse/IMPALA-9635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17079488#comment-17079488
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Tim Armstrong commented on IMPALA-9635:
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Are you thinking of changing appx_count_distinct to use this different
implementation?
[https://impala.apache.org/docs/build/html/topics/impala_appx_count_distinct.html]
.Will this be a new flag that enables a bigger set of approximation functions?
> Rewrite count(distinct) to use ds_hll_* functions when in BI mode
> -----------------------------------------------------------------
>
> Key: IMPALA-9635
> URL: https://issues.apache.org/jira/browse/IMPALA-9635
> Project: IMPALA
> Issue Type: New Feature
> Components: Frontend
> Reporter: Gabor Kaszab
> Priority: Major
>
> This effort is dependent on a major FE work that is going on currently. The
> task here is to verify that:
> 1) There is a switch to turn on BI mode
> 2) In BI mode count(distinct) queries are rewritten to ds_hll_* approx
> functions
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