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Date: Fri, 31 Aug 2012 20:05:07 +1100 (NCT)
From: "Thomas Mueller (JIRA)" <jira@apache.org>
To: oak-dev@jackrabbit.apache.org
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Subject: [jira] [Commented] (OAK-28) Query implementation
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    [ https://issues.apache.org/jira/browse/OAK-28?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13445785#comment-13445785 ] 

Thomas Mueller commented on OAK-28:
-----------------------------------

Thanks Chetan! Fixed in revision 1379373.
                
> Query implementation
> --------------------
>
>                 Key: OAK-28
>                 URL: https://issues.apache.org/jira/browse/OAK-28
>             Project: Jackrabbit Oak
>          Issue Type: New Feature
>          Components: core, jcr
>            Reporter: Thomas Mueller
>            Assignee: Thomas Mueller
>              Labels: query
>         Attachments: OakToJcrQueryTreeConverter.java
>
>
> A query engine needs to be implemented. 
> A query parser in oak-core should be able to handle xpath, sql2 and optionally other query languages. The jcr component must generate a valid query in one of those languages from JQOM queries and pass that statement along with value bindings, limit, offset, and name space mappings to the oak-core. 
> We need to:
> * Define the oak-core API for handling queries. How are do we handle name space mappings, limit and offset
> * Implement a query builder in the jcr component which takes care of translating JQOM queries to statements in string form 
> * Implement a query parser in oak-core and decide on a versatile AST representation which works with all query languages and which is extensible to future query languages.
> * Implement the actual query execution engine which interprets the query AST

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