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From "Albert Lee (Reopened) (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (OPENJPA-2099) Reuse relationship selection
Date Tue, 07 Feb 2012 15:52:59 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-2099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Albert Lee reopened OPENJPA-2099:
---------------------------------


This issue is still do not contain a complete solution, This will remain open and target to
2.3.0.
                
> Reuse relationship selection 
> -----------------------------
>
>                 Key: OPENJPA-2099
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2099
>             Project: OpenJPA
>          Issue Type: Improvement
>            Reporter: Pinaki Poddar
>            Assignee: Pinaki Poddar
>             Fix For: 2.3.0
>
>   Original Estimate: 1,008h
>  Remaining Estimate: 1,008h
>
> Related entities are often loaded via a separate select operation when an unloaded field
is accessed. The select operation for a relationship field structurally (i.e. which tables
it joins to or what columns it selects) is invariant at instance level. Only thing that changes
across entity instances is the foreign/primary key identifier values used in joining. The
major computation cost is paid to analyze to build the select structure by analyzing the mapping
metadata of class/field involved. As noted, this computation is invariant for each instance
access except the primary/foreign key values involved. 
> However, the core infrastructure for this frequent operation (because it is carried out
whenever a relationship field is loaded for every instance) is not designed for reuse. The
select gets constructed every time, the class/field mapping metadata gets analyzed every time,
before the select is executed on the database. 
> What is required to avoid this repeated and unnecessary cost is to reuse a select instance
computed for every relationship field only once but binding different parameters on every
execution.      
> The task is non-trivial because of the select abstraction (a highly complex and critical
data structure) is not designed with such parameter rebinding in mind. 
> This issue attempts to remedy that limitation. 

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