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From "Andrus Adamchik (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (CAY-2005) Improving generated DISTINCT performance on PostgreSQL
Date Wed, 29 Apr 2015 10:57:06 GMT

     [ https://issues.apache.org/jira/browse/CAY-2005?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrus Adamchik reopened CAY-2005:
----------------------------------

> Improving generated DISTINCT performance on PostgreSQL
> ------------------------------------------------------
>
>                 Key: CAY-2005
>                 URL: https://issues.apache.org/jira/browse/CAY-2005
>             Project: Cayenne
>          Issue Type: Improvement
>            Reporter: Andrus Adamchik
>            Assignee: Andrus Adamchik
>             Fix For: 4.0.M3
>
>
> The problem is described here: http://markmail.org/message/j7alu33vfm7rjeba  Auto-generated
DISTINCT keyword when translating SelectQuery results in slowdown of PostgreSQL queries (won't
be surprised if this affects other DBs as well). Alternative PostgreSQL syntax "DISTINCT ON(id1,
id2, ..)" solves the issue.



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