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                                    <td id="header-text-container" valign="middle" style="padding: 0; border-collapse: collapse; vertical-align: middle; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 1px"> <a class="user-hover" rel="JulienBenichou" id="email_JulienBenichou" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=JulienBenichou" style="color:#6c797f;; color: #3b73af; text-decoration: none">Julien Benichou</a> <strong>created</strong> an issue </td> 
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                                    <!-- there needs to be content in the cell for it to render in some clients --> 
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                                    <td class="email-content-main mobile-expand " style="padding: 0; border-collapse: collapse; border-left: 1px solid #cccccc; border-right: 1px solid #cccccc; border-top: 0; border-bottom: 0; padding: 0 15px 0 16px; background-color: #ffffff" bgcolor="#ffffff"> 
                                        <table class="page-title-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0; mso-table-rspace: 0"> 
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                                                    <td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HSEARCH" style="color: #3b73af; text-decoration: none">Hibernate Search</a> / <a href="https://hibernate.atlassian.net/browse/HSEARCH-2535" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-f4a2f57a-9b01-43c9-8811-ba8d679309b7" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HSEARCH-2535" style="color: #3b73af; text-decoration: none">HSEARCH-2535</a> </td> 
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                                                    <td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HSEARCH-2535" style="color: #3b73af; text-decoration: none">Facets on a String collection field</a> </span> </td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th> 
                                                    <td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-f4a2f57a-9b01-43c9-8811-ba8d679309b7" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td> 
                                                </tr> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th> 
                                                    <td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.5.5.Final </td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Assignee:</th> 
                                                    <td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Components:</th> 
                                                    <td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> query </td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th> 
                                                    <td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 27/Dec/2016 03:01 AM </td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Labels:</th> 
                                                    <td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> faceting </td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Priority:</th> 
                                                    <td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-major-94ec31f2-729e-4151-9a3e-9387e76b3588" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td> 
                                                </tr> 
                                                <tr> 
                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Reporter:</th> 
                                                    <td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="JulienBenichou" id="email_JulienBenichou" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=JulienBenichou" style="color:#6c797f;; color: #3b73af; text-decoration: none">Julien Benichou</a> </td> 
                                                </tr> 
                                                <tr> 
                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Original Estimate:</th> 
                                                    <td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">56h</td> 
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                                                    <th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Remaining Estimate: </th> 
                                                    <td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">56h</td> 
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                                    <td class="email-content-main mobile-expand  issue-description-container" style="padding: 0; border-collapse: collapse; border-left: 1px solid #cccccc; border-right: 1px solid #cccccc; border-top: 0; border-bottom: 0; padding: 0 15px 0 16px; background-color: #ffffff; padding-top: 5px; padding-bottom: 10px" bgcolor="#ffffff"> 
                                        <table class="text-paragraph-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0; mso-table-rspace: 0; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 2px"> 
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                                                    <td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">Hi everybody,</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I am trying to work with hibernate search facets.<br> I have three use cases :</p> 
                                                        <ul class="alternate" type="square"> 
                                                            <li>Faceting on a simple field -&gt; This is OK.</li> 
                                                            <li>Faceting on a Collection of entity (with an IndexEmbeded) -&gt; This is OK.</li> 
                                                            <li>Faceting on a simple Collection (like a Collection of String) -&gt; Thi does not work.</li> 
                                                        </ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This is an example :</p> 
                                                        <div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
                                                            <div class="codeContent panelContent" style="padding: 9px 12px"> 
                                                                <pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Field(
    name = CATEGORIES,
    bridge = @FieldBridge(impl = StringCollectionFieldBridge.class),
    analyze = Analyze.NO
)
@Facet(forField = CATEGORIES)
@Transient
<span class="code-keyword" style="color: #000091">public</span> Collection&lt;<span class="code-object" style="color: #910091">String</span>&gt; getCategories() {
    <span class="code-keyword" style="color: #000091">return</span> Lists.newArrayList(
        Iterables.transform(
            getBooks(),
            Bindings.book().category()
        )
    );
}
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I register my facets like this :</p> 
                                                        <div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
                                                            <div class="codeContent panelContent" style="padding: 9px 12px"> 
                                                                <pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">private</span> FacetManager getFacetManager() {
    <span class="code-keyword" style="color: #000091">return</span> getFullTextQuery().getFacetManager();
}
        
<span class="code-keyword" style="color: #000091">protected</span> void registerFacet(FacetingRequest facetingRequest) {
    getFacetManager().enableFaceting(facetingRequest);
}
        
<span class="code-keyword" style="color: #000091">protected</span> void registerFacet(<span class="code-object" style="color: #910091">String</span> facetName, <span class="code-object" style="color: #910091">String</span> fieldPath) {
    FacetingRequest facetingRequest = 
        getFactory().getDefaultQueryBuilder().facet()
            .name(facetName)
            .onField(fieldPath)
            .discrete()
            .includeZeroCounts(<span class="code-keyword" style="color: #000091">false</span>)
            .createFacetingRequest();
                
    registerFacet(facetingRequest);
}
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">and get facets values like this :</p> 
                                                        <div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
                                                            <div class="codeContent panelContent" style="padding: 9px 12px"> 
                                                                <pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">protected</span> Collection&lt;Facet&gt; getFacets(<span class="code-object" style="color: #910091">String</span> facetName) {
        <span class="code-keyword" style="color: #000091">return</span> getFacetManager().getFacets(facetName);
}

@Override
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">final</span> List&lt;<span class="code-object" style="color: #910091">String</span>&gt; listFacetValues(<span class="code-object" style="color: #910091">String</span> facetName) {
        <span class="code-keyword" style="color: #000091">return</span> Lists.newArrayList(
                Iterables.transform(
                        getFacets(facetName),
                        <span class="code-keyword" style="color: #000091">new</span> SerializableFunction&lt;Facet, <span class="code-object" style="color: #910091">String</span>&gt;() {
                                @Override
                                <span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> apply(Facet facet) {
                                        <span class="code-keyword" style="color: #000091">return</span> facet.getValue();
                                }
                        }
                )
        );
}
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">So when I perform this code and try to get facets values, I get a list of String like :</p> 
                                                        <div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
                                                            <div class="codeContent panelContent" style="padding: 9px 12px"> 
                                                                <pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
[<span class="code-quote" style="color: #009100">"[category1, category3]"</span>, <span class="code-quote" style="color: #009100">"[category4]"</span>, <span class="code-quote" style="color: #009100">"[category2, category5, category6]"</span>]
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This is totally normal regarding the code in the Class</p> 
                                                        <div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
                                                            <div class="codeContent panelContent" style="padding: 9px 12px"> 
                                                                <pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">In fact, facets work well on a Collection of entities because it is detected that there is embeded objects. So the method <tt>buildDocumentFieldsForEmbeddedObjects</tt> is called.<br> In this method, ther is something like this :</p> 
                                                        <div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
                                                            <div class="codeContent panelContent" style="padding: 9px 12px"> 
                                                                <pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-comment" style="color: #808080">// In a <span class="code-keyword" style="color: #000091; color: #808080">switch</span>
</span><span class="code-keyword" style="color: #000091">case</span> COLLECTION:
    Collection&lt;?&gt; collection = objectInitializer.initializeCollection( (Collection&lt;?&gt;) value );
    <span class="code-keyword" style="color: #000091">for</span> ( <span class="code-object" style="color: #910091">Object</span> collectionValue : collection ) {
        buildDocumentFields(
            collectionValue,
            doc,
            faceting,
            embeddedTypeMetadata,
            fieldToAnalyzerMap,
            processedFieldNames,
            conversionContext,
            objectInitializer,
            embeddedBoost,
            <span class="code-keyword" style="color: #000091">true</span>
    );
}
<span class="code-keyword" style="color: #000091">break</span>;
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">So it's works because you iterate on each item. Moreover, multivalued (a FacetHandling property) is set to true.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">However, on my use case, it is not an embeded. So multivalued property is set to false and the method which is called is this <tt>buildDocumentFieldsForProperties</tt> which called <tt>getFacetDocValues</tt> method on a collection object. In this method ther is something like this :</p> 
                                                        <div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
                                                            <div class="codeContent panelContent" style="padding: 9px 12px"> 
                                                                <pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-comment" style="color: #808080">// In a <span class="code-keyword" style="color: #000091; color: #808080">switch</span>
</span><span class="code-keyword" style="color: #000091">case</span> STRING: {
    <span class="code-object" style="color: #910091">String</span> stringValue = value.toString();
    <span class="code-keyword" style="color: #000091">if</span> ( stringValue.isEmpty() ) {
        <span class="code-keyword" style="color: #000091">return</span> <span class="code-keyword" style="color: #000091">null</span>;
    }                        
    facetField = <span class="code-keyword" style="color: #000091">new</span> SortedSetDocValuesFacetField(
        facetMetadata.getFacetName(),
        stringValue 
    );
    <span class="code-keyword" style="color: #000091">break</span>;
}
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This is applied directly on a collection object. That's why I get the result above.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I think I have a solution to fix the issue but I would like to know if this is really an issue or if I misunderstood something.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Thanks for the help.</p> </td> 
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