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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=eyJpIjoiMTA3YThkY2QzN2VjNDIwMGJjNGUxZTRiNGI5ZjhkZWIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate Search</a> / <a href="https://hibernate.atlassian.net/browse/HSEARCH-3903?atlOrigin=eyJpIjoiMTA3YThkY2QzN2VjNDIwMGJjNGUxZTRiNGI5ZjhkZWIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-6fd8c1cb-4a88-4576-981c-7380c6f38d64" 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-3903?atlOrigin=eyJpIjoiMTA3YThkY2QzN2VjNDIwMGJjNGUxZTRiNGI5ZjhkZWIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HSEARCH-3903</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">Issue Type:</th> 
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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> 
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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"> engine, mapper-pojo </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"> 29/Apr/2020 01:18 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">Fix Versions:</th> 
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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-0be7714f-b0b3-4c2a-9c26-e929ce26ea95" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </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">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="yrodiere" style="color:#6c797f;; color: #3b73af; text-decoration: none" id="email_yrodiere" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A58fa1ced-171a-4c00-97e8-5d70d442cc4b"> 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"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">The <tt>includePaths</tt> filter in <tt>@IndexedEmbedded</tt> refers to index field paths. This has several drawbacks:</p> 
                                                        <ul> 
                                                            <li>Part of the implementation has to be in the backend, which feels quite dirty.</li> 
                                                            <li>This is not very consistent with the <tt>maxDepth</tt> filter, which applied to the <tt>@IndexedEmbedded</tt> only (depth of fields created within an included bridge is unlimited).</li> 
                                                            <li>The filters cannot easily be applied to dynamic fields, so dynamic fields are always included as soon as their nearest static parent is included.</li> 
                                                            <li>The filter can end up including some fields declared by a custom field bridge, but not others. 
                                                                <ul> 
                                                                    <li>This does not make sense performance-wise as the fields will still be populated by the bridge, but ignored by the backend.</li> 
                                                                    <li>Worse, when we introduce support for bridge-defined predicates ( <span class="jira-issue-macro" data-jira-key="HSEARCH-3320"> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3320" class="jira-issue-macro-key issue-link" title="Predicates on bridge-registered object fields" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=medium&amp;avatarId=12151&amp;avatarType=issuetype"> HSEARCH-3320 </a> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-complete jira-macro-single-issue-export-pdf" style="background: #cccccc; border: 1px solid #cccccc; border-radius: 3px; color: #333333; display: inline-block; font-size: 11px; font-weight: bold; line-height: 99%; margin: 0; padding: 2px 5px; text-align: center; text-decoration: none; text-transform: uppercase; background-color: #ffffff; border-color: #cccccc; color: #333333" bgcolor="#ffffff">Reopened</span> </span> ), we may end up with dysfunctional predicates because only some fields are present, while the bridge expects all fields to be present.</li> 
                                                                </ul> </li> 
                                                            <li>We are forced to use inference to detect which bridges should be included or excluded, based on the fields they declared. 
                                                                <ul> 
                                                                    <li>This code is unnecessarily complex.</li> 
                                                                    <li>This code does not work correctly with field templates, since we cannot know in advance whether dynamic fields will be included. In particular: 
                                                                        <ul> 
                                                                            <li>Bridges that declare field templates, but only ever add dynamic fields that would not match the <tt>includePaths</tt>, are included nonetheless.</li> 
                                                                            <li>Bridges that do not declare anything and rely on field templates declared by a parent (which is legal) are excluded.</li> 
                                                                        </ul> </li> 
                                                                </ul> </li> 
                                                        </ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">We could get rid of most of the complexity by implementing filters differently, based on mapper metadata exclusively (mapping annotations and/or entity model).</p> <h4 style="margin: 10px 0 0; font-size: 14px; line-height: 1.500; margin: 20px 0 0"><a name="Solution1%3Apropertypaths" style="color: #3b73af; text-decoration: none"></a>Solution 1: property paths</h4> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">We could rely on property paths instead of field paths. Only bridges applied to included properties are themselves included.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The major drawback is that there wouldn't be any way to filter out type bridges.</p> <h4 style="margin: 10px 0 0; font-size: 14px; line-height: 1.500; margin: 20px 0 0"><a name="Solution2%3Agroups" style="color: #3b73af; text-decoration: none"></a>Solution 2: groups</h4> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">We could rely on "groups", similarly to the <tt>@LazyGroup</tt> support in Hibernate ORM, or to the group support in Hibernate Validator.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">One assigns groups to every <tt>@Field</tt>/<tt>@IndexedEmbedded</tt>, then references the groups in <tt>@IncludedEmbedded(includeGroups = ...)</tt>.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The main problem with this solution is its complexity; Validator is using groups and I know they can be pretty complex to handle. We should definitely see what makes them so complex in Validator to avoid the same problems in Search.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">For example:</p> 
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                                                                <pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Indexed
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Level1Entity {

    <span class="code-comment" style="color: #808080">// Will include id only
</span>    @IndexedEmbedded
    <span class="code-keyword" style="color: #000091">private</span> Level2Entity level2_1;

    <span class="code-comment" style="color: #808080">// Will include id, name
</span>    @IndexedEmbedded(includeGroups = {BuiltinGroups.DEFAULT, <span class="code-quote" style="color: #009100">"base"</span>})
    <span class="code-keyword" style="color: #000091">private</span> Level2Entity level2_2;

    <span class="code-comment" style="color: #808080">// Will include id, name, category
</span>    @IndexedEmbedded(includeGroups = {BuiltinGroups.DEFAULT, <span class="code-quote" style="color: #009100">"base"</span>, <span class="code-quote" style="color: #009100">"advanced"</span>})
    <span class="code-keyword" style="color: #000091">private</span> Level2Entity level2_3;

}

<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Level2Entity {

    @GenericField <span class="code-comment" style="color: #808080">// Default group
</span>    <span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> id;

    @GenericField(groups = <span class="code-quote" style="color: #009100">"base"</span>)
    <span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> name;

    @GenericField(groups = <span class="code-quote" style="color: #009100">"advanced"</span>)
    <span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> category;

}
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">It would prevent us from supporting the use case mentioned in <span class="jira-issue-macro" data-jira-key="HSEARCH-1112"> <a href="https://hibernate.atlassian.net/browse/HSEARCH-1112" class="jira-issue-macro-key issue-link" title="@IndexedEmbedded.includePaths should allow to pick paths that were excluded from the embedded entity" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=medium&amp;avatarId=12150&amp;avatarType=issuetype"> HSEARCH-1112 </a> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-complete jira-macro-single-issue-export-pdf" style="background: #cccccc; border: 1px solid #cccccc; border-radius: 3px; color: #333333; display: inline-block; font-size: 11px; font-weight: bold; line-height: 99%; margin: 0; padding: 2px 5px; text-align: center; text-decoration: none; text-transform: uppercase; background-color: #ffffff; border-color: #cccccc; color: #333333" bgcolor="#ffffff">Open</span> </span> directly, but I believe the same effect could be achieved if we defined group filters as "overriding" instead of "composable": an <tt>@IndexedEmbedded(includeGroups = "a")</tt> that includes an <tt>@IndexedEmbedded(includeGroups = "b")</tt> would just act as if the contained <tt>@IndexedEmbedded</tt> included group "a", and only group "a".</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">For example:</p> 
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                                                                <pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Indexed
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Level1Entity {

    <span class="code-comment" style="color: #808080">// Will include level2.level3.a only
</span>    @IndexedEmbedded(includeGroups = <span class="code-quote" style="color: #009100">"a"</span>)
    <span class="code-keyword" style="color: #000091">private</span> Level2Entity level2;

}

<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Level2Entity {

    @GenericField(groups = <span class="code-quote" style="color: #009100">"b"</span>)
    <span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> name;

    @IndexedEmbedded(includeGroups = <span class="code-quote" style="color: #009100">"b"</span>) <span class="code-comment" style="color: #808080">// includeGroups is overridden in Level1Entity
</span>    <span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> id;

}

<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Level3Entity {

    @GenericField(group = <span class="code-quote" style="color: #009100">"a"</span>)
    <span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> a;

    @GenericField(group = <span class="code-quote" style="color: #009100">"b"</span>)
    <span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> b;

}
</pre> 
                                                            </div>
                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">There are pros and cons:</p> 
                                                        <ul> 
                                                            <li>Pro: Groups would be much easier to implement and understand: the various filters defined in indexed-embedded entities would no longer be relevant.</li> 
                                                            <li>Con: it would become harder to manage cycles through group filtering: you would no longer be able to rely on indexed-embedded entities to filter out cycles through groups (since their group filters are ignored).</li> 
                                                            <li>Con: the behavior would not be consistent with that of <tt>maxDepth</tt>.</li> 
                                                        </ul> <h4 style="margin: 10px 0 0; font-size: 14px; line-height: 1.500; margin: 20px 0 0"><a name="Next" style="color: #3b73af; text-decoration: none"></a>Next</h4> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">As a second step, we should probably deprecate <tt>includePaths</tt> and mark it for removal in a later major version (7+).</p> </td> 
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