[jira] [Commented] (CALCITE-1853) Push Count distinct into Druid when approximate results are acceptable

["Zain Humayun (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-1853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16056386#comment-16056386 ] 

Zain Humayun commented on CALCITE-1853:
---------------------------------------

PR: https://github.com/apache/calcite/pull/478

> Push Count distinct into Druid when approximate results are acceptable
> ----------------------------------------------------------------------
>
>                 Key: CALCITE-1853
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1853
>             Project: Calcite
>          Issue Type: Bug
>          Components: druid
>            Reporter: Zain Humayun
>            Assignee: Zain Humayun
>
> Currently queries such as
> {code:sql}
> select count(distinct "dimension") from "table";
> {code}
> are not pushed into Druid using the cardinality aggregator because it produces an approximate result. There exists a JDBC string parameter called {{approximateDistinctCount}} introduced in CALCITE-1587 that lets the user specify whether approximate results are acceptable in count distinct queries, however this parameter is not currently utilized by the Druid adapter.



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