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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?atlOrigin=eyJpIjoiYTI4YzgxZjc5NTBmNDkzYTlmN2NlNTg1NGJlMTM2N2UiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate Search</a> / <a href="https://hibernate.atlassian.net/browse/HSEARCH-3391?atlOrigin=eyJpIjoiYTI4YzgxZjc5NTBmNDkzYTlmN2NlNTg1NGJlMTM2N2UiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-b66cb56f-84bd-4e13-b261-616b7f47bdd4" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3391?atlOrigin=eyJpIjoiYTI4YzgxZjc5NTBmNDkzYTlmN2NlNTg1NGJlMTM2N2UiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HSEARCH-3391</a> </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">Change By:</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="yrodiere" id="email_yrodiere" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=yrodiere" style="color:#6c797f;; color: #3b73af; text-decoration: none">Yoann Rodière</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <span class="diffcontext">Historically projections on multi-valued have not been possible, see</span> <span class="diffaddedchars" style="background-color:#ddfade;"> [</span> <span class="diffcontext"> HSEARCH</span> <span class="diffaddedchars" style="background-color:#ddfade;"></span> <span class="diffcontext">-1895</span> <span class="diffaddedchars" style="background-color:#ddfade;">|https://hibernate.atlassian.net/browse/HSEARCH-1895]</span> <span class="diffcontext"> in particular. The exact reasons are a bit unclear.<br><br>It would be interesting to support them, especially in combination with the nested object field support.<br><br>Note that two cases, at least, should be considered:<br><br>1. Multi-valued fields on the root document<br>2. Single-valued fields in multi-valued nested documents<br><br>APIs and implementations are still TBD, but we'll most likely leverage the projection DSL (</span> <span class="diffaddedchars" style="background-color:#ddfade;"> [</span> <span class="diffcontext">HSEARCH</span> <span class="diffaddedchars" style="background-color:#ddfade;"></span> <span class="diffcontext">-3222</span> <span class="diffaddedchars" style="background-color:#ddfade;">|https://hibernate.atlassian.net/browse/HSEARCH-3222]</span> <span class="diffcontext">), in particular the composite projections (</span> <span class="diffaddedchars" style="background-color:#ddfade;"> [</span> <span class="diffcontext">HSEARCH</span> <span class="diffaddedchars" style="background-color:#ddfade;"></span> <span class="diffcontext">-3390</span> <span class="diffaddedchars" style="background-color:#ddfade;">|https://hibernate.atlassian.net/browse/HSEARCH-3390]</span> <span class="diffcontext">). We may have to rely on metadata telling us which field is potentially multi-valued and which is not, see</span> <span class="diffaddedchars" style="background-color:#ddfade;"> [</span> <span class="diffcontext"> HSEARCH</span> <span class="diffaddedchars" style="background-color:#ddfade;"></span> <span class="diffcontext">-3324</span> <span class="diffaddedchars" style="background-color:#ddfade;">|https://hibernate</span> <span class="diffcontext">.</span> <span class="diffaddedchars" style="background-color:#ddfade;">atlassian.net/browse/HSEARCH-3324] .<br><br>*WARNING*: the existing code is optimized based on the assumption projected fields have only one value. In particular ReusableDocumentStoredFieldVisitor may fail to retrieve values beyond the first one, or succeed, depending on the case. *Tests may not detect this problem*, so we should have a very close look at this class.</span> </td>
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