[teiid-issues] [JBoss JIRA] (TEIID-2728) Very large sorts are inefficient

[RH Bugzilla Integration (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-2728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12921296#comment-12921296 ] 

RH Bugzilla Integration commented on TEIID-2728:
------------------------------------------------

Van Halbert <vhalbert at redhat.com> changed the Status of [bug 1028016|https://bugzilla.redhat.com/show_bug.cgi?id=1028016] from NEW to ASSIGNED
                
> Very large sorts are inefficient
> --------------------------------
>
>                 Key: TEIID-2728
>                 URL: https://issues.jboss.org/browse/TEIID-2728
>             Project: Teiid
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: 8.4
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>             Fix For: 8.6
>
>
> This is a regression of TEIID-2429.  When the memory space needed for a sort is estimated to be above 2 GB, the expression used (even though it's assigned to a long) will overflow.  This then causes the processing to use the batch size as the intermediate sort buffer size, which for any high row count will lead to many passes (the logic typically should achieve at most a two pass sort).

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