[teiid-issues] [JBoss JIRA] (TEIID-2390) Improve xml/json production

Fri Jun 21 12:46:21 EDT 2013

     [ https://issues.jboss.org/browse/TEIID-2390?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-2390.
-----------------------------------

    Fix Version/s: 8.5
       Resolution: Done

Just improved direct nesting of jsonArray/jsonObject.  Further improvements to json/xml would likely take the form of a compiled plan similar to an xmldocument plan, such that it can be built top down and account for blocked exceptions.  As it stands it would be a major change to allow inline evaluation (to prevent recopying) of aggregate expressions and subqueries.  Switching a pull processing notion would also help to simply delay evaluation until the expression is fully evaluated, but must all of the logic was written from the perspective of fully realizing the values as evaluation proceeds.

The performance improvement is minor for small documents or if there is little direct nesting, thus I'm not proceeding with SQL/XML at this time.  

> Improve xml/json production
> ---------------------------
>
>                 Key: TEIID-2390
>                 URL: https://issues.jboss.org/browse/TEIID-2390
>             Project: Teiid
>          Issue Type: Enhancement
>          Components: Query Engine
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>             Fix For: 8.4.1, 8.5
>
>
> The current xml/json logic can produce a lot of intermediate results that are recopied and can result in a slower performance for larger documents.  
> The logic could allow for nested evaluations to delay creating their full string forms or simply allow the return values to remain appendable rather than requiring full copies.

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