cayenne-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Andrus Adamchik (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CAY-2005) Improving generated DISTINCT performance on PostgreSQL
Date Fri, 01 May 2015 05:40:06 GMT

    [ https://issues.apache.org/jira/browse/CAY-2005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14522794#comment-14522794
] 

Andrus Adamchik commented on CAY-2005:
--------------------------------------

Appears to be so. Will have to roll back the change and think of other way to provide row
uniqueness when using criteria on to-many

> 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message