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From "Thomas Mueller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-225) Sling I18N queries not supported by Oak
Date Wed, 08 Aug 2012 13:05:20 GMT

    [ https://issues.apache.org/jira/browse/OAK-225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13431099#comment-13431099
] 

Thomas Mueller commented on OAK-225:
------------------------------------

I tried to add the comment on OAK-225 yesterday, but Jira was not working properly. It seems
even today it sometimes doesn't work, let's see.

The fix I did so far was to support "fn:lower-case". This wasn't supported before (even for
very very simple queries).

The query is not converted correctly, I know, and this needs to be either fixed or it has
to fail (throw an exception). 

For XPath queries of this form, a join would be needed I believe. I didn't look into that
so far, I'm not sure how easy it is to support it (all I know is that it's not trivial). I
guess it's not just a question on whether we 'want' to support it (I want :-) but also if
it's worth the effort, and this I'm not convinced yet. It sounds like, as a short term solution,
it would be relatively easy to change the query in Sling, but in the long term I guess it
would be better to support such queries.

                
> Sling I18N queries not supported by Oak
> ---------------------------------------
>
>                 Key: OAK-225
>                 URL: https://issues.apache.org/jira/browse/OAK-225
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 0.3
>            Reporter: Jukka Zitting
>            Priority: Minor
>              Labels: sling, xpath
>
> The Sling I18N component issues XPath queries like the following:
> {code:none}
> //element(*,mix:language)[fn:lower-case(@jcr:language)='en']//element(*,sling:Message)[@sling:message]/(@sling:key|@sling:message)
> {code}
> Such queries currently fail with the following exception:
> {code:none}
> javax.jcr.query.InvalidQueryException: java.text.ParseException: Query: //element(*,mix:language)[fn:lower-(*)case(@jcr:language)='en']//element(*,sling:Message)[@sling:message]/(@sling:key|@sling:message);
expected: (
>         at org.apache.jackrabbit.oak.jcr.query.QueryManagerImpl.executeQuery(QueryManagerImpl.java:115)
>         at org.apache.jackrabbit.oak.jcr.query.QueryImpl.execute(QueryImpl.java:85)
>         at org.apache.sling.jcr.resource.JcrResourceUtil.query(JcrResourceUtil.java:52)
>         at org.apache.sling.jcr.resource.internal.helper.jcr.JcrResourceProvider.queryResources(JcrResourceProvider.java:262)
>         ... 54 more
> Caused by: java.text.ParseException: Query: //element(*,mix:language)[fn:lower-(*)case(@jcr:language)='en']//element(*,sling:Message)[@sling:message]/(@sling:key|@sling:message);
expected: (
>         at org.apache.jackrabbit.oak.query.XPathToSQL2Converter.getSyntaxError(XPathToSQL2Converter.java:704)
>         at org.apache.jackrabbit.oak.query.XPathToSQL2Converter.read(XPathToSQL2Converter.java:410)
>         at org.apache.jackrabbit.oak.query.XPathToSQL2Converter.parseExpression(XPathToSQL2Converter.java:336)
>         at org.apache.jackrabbit.oak.query.XPathToSQL2Converter.parseCondition(XPathToSQL2Converter.java:279)
>         at org.apache.jackrabbit.oak.query.XPathToSQL2Converter.parseAnd(XPathToSQL2Converter.java:252)
>         at org.apache.jackrabbit.oak.query.XPathToSQL2Converter.parseConstraint(XPathToSQL2Converter.java:244)
>         at org.apache.jackrabbit.oak.query.XPathToSQL2Converter.convert(XPathToSQL2Converter.java:153)
>         at org.apache.jackrabbit.oak.query.QueryEngineImpl.parseQuery(QueryEngineImpl.java:86)
>         at org.apache.jackrabbit.oak.query.QueryEngineImpl.executeQuery(QueryEngineImpl.java:99)
>         at org.apache.jackrabbit.oak.query.QueryEngineImpl.executeQuery(QueryEngineImpl.java:39)
>         at org.apache.jackrabbit.oak.jcr.query.QueryManagerImpl.executeQuery(QueryManagerImpl.java:110)
> {code}

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