[teiid-issues] [JBoss JIRA] (TEIID-2983) MongoDB: Function "count()" returns sum instead of number of rows
Steven Hawkins (JIRA)
issues at jboss.org
Thu Jun 5 10:10:16 EDT 2014
[ https://issues.jboss.org/browse/TEIID-2983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973779#comment-12973779 ]
Steven Hawkins commented on TEIID-2983:
---------------------------------------
> Is there a way re-write multiple aggregate statement above? right now I can only think that that needs to split into two statements.
Yes, unless you can use subqueries the only other alternative would be a more complicated sum expression:
sum(case when col is not null then 1 else 0 end)
> MongoDB can group by multiple elements in a group, then we can do a sum like
The grouping should come from the group by correct?
> MongoDB: Function "count()" returns sum instead of number of rows
> -----------------------------------------------------------------
>
> Key: TEIID-2983
> URL: https://issues.jboss.org/browse/TEIID-2983
> Project: Teiid
> Issue Type: Bug
> Components: Misc. Connectors
> Affects Versions: 8.7.1
> Reporter: Van Halbert
> Assignee: Ramesh Reddy
> Labels: Beta1
> Fix For: 8.7.1, 8.8
>
>
> Function "count()" returns sum of rows instead of number of rows
> Query [1] returns sum of values of all rows of IntKey column.
> Query [2] correctly returns number of rows
>
> [1] SELECT COUNT(IntKey) FROM BQT1.SmallA
> [2] SELECT COUNT(*) FROM BQT1.SmallA
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