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

[Zain Humayun (JIRA)]

Zain Humayun created CALCITE-1853:
-------------------------------------

             Summary: 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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