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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-3222" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-b78bb849-b480-4200-9a72-90d2823980de" height="16" width="16" border="0" align="absmiddle" alt="Task" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3222" style="color: #3b73af; text-decoration: none">HSEARCH-3222</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-3222" style="color: #3b73af; text-decoration: none">Introduce a projection DSL</a> </span> </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">The idea would be to allow to create {{SearchProjection<T>}} objects from a {{SearchTarget}}, and use these objects when creating a query: {{.asProjections( projectionObject1, projectionObject2, ...)}}.<br><br>This would allow three things:<br><br>* Implementation of parameterized projections, where naming the projection is not enough, and we need to pass parameters to it. See for example the spatial distance projections, where we need to pass a latitude and longitude: HSEARCH-3190<br>* Enabling and disabling bridges in projections; see HSEARCH-3257<br>* Type-safe projections, i.e. passing typed references to the {{asProjections()}} methods, and get a {{SearchQuery<Pair<T, U>>}}, or {{SearchQuery<Triplet<T, U, V>>}}, and so on depending on the number of parameters. This would obviously only be possible for a small number of parameters (say, up to 5), because we would have to declare and implement one {{asProjections()}} method for each possible number of parameters. Note that, in order to allow that, we should at the very least make {{asProjections}} set the query type to {{SearchQuery<? extends List<?>>}} instead of the current {{SearchQuery<List<?>>}}.<br><br>See also HSEARCH-2265</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br>An example of APIs can be found here: https://github.com/hibernate/hibernate-search-6-poc/commit/85edb83d1d248dba0514a78177b1c19761f67646<br><br>Let's discuss the APIs again, though, since they are not very consistent with what we offer for predicates, and more importantly for sorts.</span> </td>
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