[jira] [Resolved] (CALCITE-733) Multiple distinct-COUNT query gives wrong results

["Julian Hyde (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-733?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde resolved CALCITE-733.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 1.3.0-incubating

Fixed in http://git-wip-us.apache.org/repos/asf/incubator-calcite/commit/0e7de28f.

> Multiple distinct-COUNT query gives wrong results
> -------------------------------------------------
>
>                 Key: CALCITE-733
>                 URL: https://issues.apache.org/jira/browse/CALCITE-733
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>             Fix For: 1.3.0-incubating
>
>
> The query {code}select "department_id" as d, count(distinct "education_level") as c1, count(distinct "gender") as c2 from foodmart_clone."employee" group by "department_id";{code} returns 0 rows and should return 12. In the plan {noformat}EnumerableCalc(expr#0..3=[{inputs}], department_id=[$t2], C1=[$t3], C2=[$t1])
>   EnumerableJoin(condition=[=($0, $2)], joinType=[inner])
>     EnumerableAggregate(group=[{0}], groups=[[{7}]], C2=[COUNT($1)])
>       EnumerableAggregate(group=[{7, 15}])
>         EnumerableTableScan(table=[[FOODMART_CLONE, employee]])
>     EnumerableAggregate(group=[{0}], groups=[[{7}]], C1=[COUNT($1)])
>       EnumerableAggregate(group=[{7, 13}])
>         EnumerableTableScan(table=[[FOODMART_CLONE, employee]])
> {noformat} you can see {noformat}group=[{0}], groups=[[{7}]]{noformat} and this is wrong -- the groups should be made up of the same bits as the group. We should add an assert on this invariant and fixing it will probably cause the plan to return the right results.



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