[teiid-issues] [JBoss JIRA] (TEIID-3119) Improve full sort performance for dup removal and grouping

[Johnathon Lee (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-3119?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Johnathon Lee updated TEIID-3119:
---------------------------------
    Fix Version/s: 8.7.6.6_2


> Improve full sort performance for dup removal and grouping
> ----------------------------------------------------------
>
>                 Key: TEIID-3119
>                 URL: https://issues.jboss.org/browse/TEIID-3119
>             Project: Teiid
>          Issue Type: Enhancement
>          Components: Query Engine
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>             Fix For: 8.9, 8.7.6.6_2
>
>
> We perform a full sort for grouping/distinct reusing the existing sorting logic.  This is not as efficient as it could for larger data sets with smaller numbers of groups.  A hash implementation or combining the grouping with the sorting would perform better.



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