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From "Andrei Veprev (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CAY-1700) Split long DISJOINT_BY_ID prefetch query on several smaller queries
Date Sat, 28 Apr 2012 12:17:47 GMT

     [ https://issues.apache.org/jira/browse/CAY-1700?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrei Veprev updated CAY-1700:
-------------------------------

    Attachment: CAY-1700.patch

Patch:
* implemented split of queries
* using special property to define max number of qualifiers per query
* changed IncrementalFaultList to use the same property

Consider to change javadoc for property if it isn't written good.
                
> Split long DISJOINT_BY_ID prefetch query on several smaller queries
> -------------------------------------------------------------------
>
>                 Key: CAY-1700
>                 URL: https://issues.apache.org/jira/browse/CAY-1700
>             Project: Cayenne
>          Issue Type: Improvement
>          Components: Core Library
>    Affects Versions: 3.1M4
>            Reporter: Andrei Veprev
>             Fix For: 3.1M4
>
>         Attachments: CAY-1700.patch
>
>
> It is improvement for CAY-1681. From Andrus' comment:
> And one more thing we will probably have to implement - breaking down OR query if it
gets too long. This is a real problem which has been repeatedly mentioned in the context of
the paginated queries, and in fact solved in IncrementalFaultList. see IncrementalFaultList.resolveInterval
- it checks the number of clauses in the qualifier against 'maxFetchSize'. We may need to
make "maxFetchSize" a container property used by IncrementalFaultList as well as our prefetch
strategy, and take it into account in the later.

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