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https://issues.apache.org/jira/browse/OAK-3156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14693234#comment-14693234
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Vikas Saurabh commented on OAK-3156:
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That would still just solve the permission issue. Final rows would still be 
tried to be compared with primary type of node being queried and which might 
not match with the node types being queried -- like if we query for suggestion 
on test:Asset under /content then we probably won't want a requirement that 
/content need to be a sub-type of test:Asset.

> Lucene suggestions index definition can't be restricted to a specific type of 
> node
> ----------------------------------------------------------------------------------
>
>                 Key: OAK-3156
>                 URL: https://issues.apache.org/jira/browse/OAK-3156
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: lucene
>            Reporter: Vikas Saurabh
>            Assignee: Tommaso Teofili
>         Attachments: LuceneIndexSuggestionTest.java
>
>
> While performing a suggestor query like 
> {code}
> SELECT [rep:suggest()] as suggestion  FROM [nt:unstructured] WHERE 
> suggest('foo')
> {code}
> Suggestor does not provide any result. In current implementation, 
> [suggestions|http://jackrabbit.apache.org/oak/docs/query/lucene.html#Suggestions]
>  in Oak work only for index definitions for {{nt:base}} nodetype.
> So, an index definition like:
> {code:xml}
>     <lucene-suggest
>         jcr:primaryType="oak:QueryIndexDefinition"
>         async="async"
>         compatVersion="{Long}2"
>         type="lucene">
>         <indexRules jcr:primaryType="nt:unstructured">
>             <nt:base jcr:primaryType="nt:unstructured">
>                 <properties jcr:primaryType="nt:unstructured">
>                     <description
>                         jcr:primaryType="nt:unstructured"
>                         analyzed="{Boolean}true"
>                         name="description"
>                         propertyIndex="{Boolean}true"
>                         useInSuggest="{Boolean}true"/>
>                 </properties>
>             </nt:base>
>         </indexRules>
>     </lucene-suggest>
> {code}
> works, but if we change nodetype to {{nt:unstructured}} like:
> {code:xml}
>     <lucene-suggest
>         jcr:primaryType="oak:QueryIndexDefinition"
>         async="async"
>         compatVersion="{Long}2"
>         type="lucene">
>         <indexRules jcr:primaryType="nt:unstructured">
>             <nt:unstructured jcr:primaryType="nt:unstructured">
>                 <properties jcr:primaryType="nt:unstructured">
>                     <description
>                         jcr:primaryType="nt:unstructured"
>                         analyzed="{Boolean}true"
>                         name="description"
>                         propertyIndex="{Boolean}true"
>                         useInSuggest="{Boolean}true"/>
>                 </properties>
>             </nt:base>
>         </indexRules>
>     </lucene-suggest>
> {code}
> , it won't work.
> The issue is that suggestor implementation essentially is passing a pseudo 
> row with path=/.:
> {code:title=LucenePropertyIndex.java}
>     private boolean loadDocs() {
> ...
>                         queue.add(new LuceneResultRow(suggestedWords));
> ...
> {code}
> and
> {code:title=LucenePropertyIndex.java}
>         LuceneResultRow(Iterable<String> suggestWords) {
>             this.path = "/";
>             this.score = 1.0d;
>             this.suggestWords = suggestWords;
>         }
> {code}
> Due to path being set to "/", {{SelectorImpl}} later filters out the result 
> as {{rep:root}} (primary type of "/") isn't a {{nt:unstructured}}.



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