[teiid-issues] [JBoss JIRA] (TEIID-3743) Multiple Count Distinct Columns Fails for Impala

[Scott Wallace (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-3743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242692#comment-13242692 ] 

Scott Wallace commented on TEIID-3743:
--------------------------------------

We are using translator-hive-8.13.3.jar

> Multiple Count Distinct Columns Fails for Impala
> ------------------------------------------------
>
>                 Key: TEIID-3743
>                 URL: https://issues.jboss.org/browse/TEIID-3743
>             Project: Teiid
>          Issue Type: Bug
>          Components: Misc. Connectors
>    Affects Versions: 8.11.4
>            Reporter: Scott Wallace
>            Assignee: Steven Hawkins
>             Fix For: 8.12
>
>
> Teiid Impala translator incorrectly allows multiple count distinct columns, which fails to execute since it is not supported by Impala.
> Per Cloudera documentation:
> {quote}By default, Impala only allows a single COUNT(DISTINCT columns) expression in each query.
> To produce the same result as multiple COUNT(DISTINCT) expressions, you can use the following technique for queries involving a single table:
> select v1.c1 result1, v2.c1 result2 from (select count(distinct col1) as c1 from t1) v1 cross join (select count(distinct col2) as c1 from t1) v2;{quote}
> The Teiid-Impala translator should ideally rewrite the query as necessary so that the query does not fail executing multiple count distincts against Impala.



--
This message was sent by Atlassian JIRA
(v6.4.11#64026)