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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">Affects 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">Created:</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">Reporter:</th> 
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                                                    <td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">It seems that the handling of JPQL <tt>KEY()</tt> functions has changed in Hibernate 5.1.0.Final in comparison to Hibernate 4.3.8.Final.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I have attached a test project that illustrates the issue. Following JPQL query is used (<tt>templateEntries</tt> is a <tt>Map&lt;Template, TemplateEntry&gt;</tt>, both entities):</p> 
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                                                                <pre class="code-sql" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
   <span class="code-keyword" style="color: #000091">SELECT</span> d.name, KEY(templateEntries) <span class="code-keyword" style="color: #000091">FROM</span> Document d
   LEFT JOIN d.documentVersions versions
   LEFT JOIN versions.templateEntries templateEntries
</pre> 
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                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Hibernate 5.1.0.Final generates the following query:</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 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
                                                            <div class="codeContent panelContent" style="padding: 9px 12px"> 
                                                                <pre class="code-sql" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
   <span class="code-keyword" style="color: #000091">select</span> document0_.name as col_0_0_, templateen2_.templateEntries_KEY as col_1_0_, template4_.id as id1_3_ 
   <span class="code-keyword" style="color: #000091">from</span> Document document0_ 
   left outer join DocumentVersion documentve1_ on document0_.id=documentve1_.document_id 
   left outer join DocumentVersion_TemplateEntry templateen2_ on documentve1_.id=templateen2_.DocumentVersion_id 
   left outer join TemplateEntry templateen3_ on templateen2_.templateEntries_id=templateen3_.id 
   inner join Template template4_ on templateen2_.templateEntries_KEY=template4_.id;
</pre> 
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                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Hibernate 4.3.8.Final generates the following query:</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 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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                                                                <pre class="code-sql" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
   <span class="code-keyword" style="color: #000091">select</span> document0_.name as col_0_0_, templateen2_.templateEntries_KEY as col_1_0_, templateen3_.id as id1_4_ 
   <span class="code-keyword" style="color: #000091">from</span> Document document0_ 
   left outer join DocumentVersion documentve1_ on document0_.id=documentve1_.document_id 
   left outer join DocumentVersion_TemplateEntry templateen2_ on documentve1_.id=templateen2_.DocumentVersion_id 
   left outer join TemplateEntry templateen3_ on templateen2_.templateEntries_id=templateen3_.id;
</pre> 
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                                                        </div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">So Hibernate 5 effectively fetches the key whereas Hibernate 4.3.x only selects the id of the key.<br> In my case, the behavior of Hibernate 5 causes an issue due to the inner join introduced which effectively dumps all documents without <tt>templateEntries</tt> (which I specifically aimed to prevent by using left joins). Obviously, this use case worked with Hibernate 4.3.x.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Changing the inner join to a left join would fix this concrete case.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">I had a quick look in the spec and it seems that it does not define whether the use of <tt>KEY()</tt> should fetch the key or not, though the Hibernate 5 way feels "more right". However, it would be nice to have a way to only select the id of a key and thereby eliminating the need for the fetch join by just selecting <tt>templateen2_.templateEntries_KEY</tt>.<br> This could be achieved by allowing both <tt>KEY(templateEntries)</tt> and <tt>KEY(templateEntries).id</tt>. Hibernate currently does not support dereferencing of <tt>KEY()</tt> functions but the spec contains examples of similar usages.</p> </td> 
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