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

[Steven Hawkins (JIRA)]

Steven Hawkins created TEIID-2728:
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             Summary: 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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