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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/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-11246" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-a61a5ebb-da5b-449b-9642-5a8f2651c32b" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11246" style="color: #3b73af; text-decoration: none">HHH-11246</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/HHH-11246" style="color: #3b73af; text-decoration: none">Useless class lookup during constant conversion</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="ctabin" id="email_ctabin" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=ctabin" style="color:#6c797f;; color: #3b73af; text-decoration: none">Cédric Tabin</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">Hibernate performs useless class lookup when applying the constant conversion. For instance, in the query _SELECT p FROM Event p WHERE p.eventstart<?1_, there will be a class lookup for _ch.astorm.entities.Event_ and for _p.eventstart_ and this will occur each time the query needs to be compiled by Hibernate.<br>There will be a warning in the logs just as mentioned in the issue HHH-11245.<br><br>The "randomess"</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> describe</span> <span class="diffaddedchars" style="background-color:#ddfade;"> described</span> <span class="diffcontext"> in HHH-11243 is caused by query plan caching (see HHH-4627). Hence, to reproduce the warning systematically, a "new" query needs to be given to Hibernate, which is somewhat easy if they are not parametrized.<br>So, I set the property _hibernate.query.plan_cache_max_size_ to 40 (which will be the minimum accepted value because of the _BoundedConcurrentHashMap_ fixed parameters created in _QueryPlanCache_) and created a simple loop in each query to force renewal of the cache:<br><br>{code:java}<br>entityManager.createQuery("SELECT p FROM Event p WHERE p.eventstart<=?1 AND p.eventend>=?2", Event.class);<br>for(int qp=0 ; qp<40 ; ++qp) {<br> //generate a different query each time to force the query cache plan to renew<br> entityManager.createQuery("SELECT p FROM Event p WHERE 0="+qp);<br>}<br>{code}<br><br>My patch suggests transforming the method _handleDotStructure_ in _QueryTranslatorImpl_ (line 613) to:<br><br>{code:java}<br>private void handleDotStructure(AST dotStructureRoot) {<br> final String expression = ASTUtil.getPathText( dotStructureRoot ); <br> final Object entity = factory.getMetamodel().entity( expression );<br> if( entity == null && expression.indexOf('.') != -1 ) { //avoid some useless lookups<br> //lookup & constant transformation, if any<br> }<br>}<br>{code}<br><br>This check will avoid entity lookups (because the expression _ch.astorm.entities.Event_ will cause a lookup on _ch.astorm.entities_ which will be always null), but the patterns like _p.eventstart_ will still cause IMHO a useless lookup which could probably be avoided by using the parsed HQL query.<br><br>Any suggestion is welcome.<br>Thanks in advance.</span> </td>
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