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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=eyJpIjoiYzhhMmFhNDRmN2IyNDIyNWE5OTM4YzNiYmVmYzk5OWUiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate Search</a> / <a href="https://hibernate.atlassian.net/browse/HSEARCH-3390?atlOrigin=eyJpIjoiYzhhMmFhNDRmN2IyNDIyNWE5OTM4YzNiYmVmYzk5OWUiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-70c9b034-ad02-4481-9443-90ca68fc73b7" 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-3390?atlOrigin=eyJpIjoiYzhhMmFhNDRmN2IyNDIyNWE5OTM4YzNiYmVmYzk5OWUiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HSEARCH-3390</a> </td>
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<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">Follow-up on</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</span> <span class="diffcontext">.</span> <span class="diffaddedchars" style="background-color:#ddfade;">atlassian.net/browse/HSEARCH-3222] .</span> <span class="diffcontext"><br><br>The idea would be to provide a type-safe solution to building objects that encompass multiple projections, for example a "Color" object that requires a projection on the "red", "green" and "blue" fields.<br><br></span> <span class="diffaddedchars" style="background-color:#ddfade;">We would offer the ability to build such a projection:<br><br>* Though the projection DSL: \{\{target.projection().composite()….\}\}<br>* When calling .asProjections() with a multiple parameters in \{\{HibernateOrmSearchQueryResultDefinitionContext\}\} plus a BiFunction/TriFunction/etc. acting as a “hit transformer”: this would allow to create a type-safe query, returning results with a known type even when using projections.<br><br></span> <span class="diffcontext">In the future (not in this ticket), this will be particularly useful when combined with multi-valued nested object fields, allowing to get a {{List<Color>}} from a projection for example.<br><br>Draft</span> <span class="diffaddedchars" style="background-color:#ddfade;"> of the APIs</span> <span class="diffcontext">:</span> <span class="diffaddedchars" style="background-color:#ddfade;"> [</span> <span class="diffcontext"> https://github.com/yrodiere/hibernate-search/tree/projections-syntax-attempt2</span> <span class="diffaddedchars" style="background-color:#ddfade;">]</span> <span class="diffcontext"> ,</span> <span class="diffaddedchars" style="background-color:#ddfade;"> [</span> <span class="diffcontext"> https://github.com/yrodiere/hibernate-search/commit/5f9f56f587d3e44344b773bdefeb70c8fedf1be1</span> <span class="diffaddedchars" style="background-color:#ddfade;">]</span> <span class="diffcontext"><br><br>We decided to give up on the fluid API for composite projections, for two reasons:<br><br># We decided to remove the fluid APIs for predicates and sorts, so let's be consistent<br># Having one interface per number of parameters is complex to implement (or at least very redundant), and it also makes implementing extensions much more complex, because we'll have to implement each interface in each backend...</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br></span> </td>
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