[jira] [Commented] (IMPALA-9635) Rewrite count(distinct) to use ds_hll_* functions when in BI mode

["Tim Armstrong (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IMPALA-9635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17079488#comment-17079488 ] 

Tim Armstrong commented on IMPALA-9635:
---------------------------------------

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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