| <!DOCTYPE HTML> |
| <html lang="en"> |
| <head> |
| <!-- Generated by javadoc (17) --> |
| <title>TransformOrderByDistinctApplication (Apache Jena ARQ)</title> |
| <meta name="viewport" content="width=device-width, initial-scale=1"> |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> |
| <meta name="description" content="declaration: module: org.apache.jena.arq, package: org.apache.jena.sparql.algebra.optimize, class: TransformOrderByDistinctApplication"> |
| <meta name="generator" content="javadoc/ClassWriterImpl"> |
| <link rel="stylesheet" type="text/css" href="../../../../../../../stylesheet.css" title="Style"> |
| <link rel="stylesheet" type="text/css" href="../../../../../../../script-dir/jquery-ui.min.css" title="Style"> |
| <link rel="stylesheet" type="text/css" href="../../../../../../../jquery-ui.overrides.css" title="Style"> |
| <script type="text/javascript" src="../../../../../../../script.js"></script> |
| <script type="text/javascript" src="../../../../../../../script-dir/jquery-3.6.1.min.js"></script> |
| <script type="text/javascript" src="../../../../../../../script-dir/jquery-ui.min.js"></script> |
| </head> |
| <body class="class-declaration-page"> |
| <script type="text/javascript">var evenRowColor = "even-row-color"; |
| var oddRowColor = "odd-row-color"; |
| var tableTab = "table-tab"; |
| var activeTableTab = "active-table-tab"; |
| var pathtoroot = "../../../../../../../"; |
| loadScripts(document, 'script');</script> |
| <noscript> |
| <div>JavaScript is disabled on your browser.</div> |
| </noscript> |
| <div class="flex-box"> |
| <header role="banner" class="flex-header"> |
| <nav role="navigation"> |
| <!-- ========= START OF TOP NAVBAR ======= --> |
| <div class="top-nav" id="navbar-top"> |
| <div class="skip-nav"><a href="#skip-navbar-top" title="Skip navigation links">Skip navigation links</a></div> |
| <ul id="navbar-top-firstrow" class="nav-list" title="Navigation"> |
| <li><a href="../../../../../../module-summary.html">Module</a></li> |
| <li><a href="package-summary.html">Package</a></li> |
| <li class="nav-bar-cell1-rev">Class</li> |
| <li><a href="class-use/TransformOrderByDistinctApplication.html">Use</a></li> |
| <li><a href="package-tree.html">Tree</a></li> |
| <li><a href="../../../../../../../deprecated-list.html">Deprecated</a></li> |
| <li><a href="../../../../../../../index-all.html">Index</a></li> |
| <li><a href="../../../../../../../help-doc.html#class">Help</a></li> |
| </ul> |
| </div> |
| <div class="sub-nav"> |
| <div> |
| <ul class="sub-nav-list"> |
| <li>Summary: </li> |
| <li>Nested | </li> |
| <li><a href="#field-summary">Field</a> | </li> |
| <li><a href="#constructor-summary">Constr</a> | </li> |
| <li><a href="#method-summary">Method</a></li> |
| </ul> |
| <ul class="sub-nav-list"> |
| <li>Detail: </li> |
| <li>Field | </li> |
| <li><a href="#constructor-detail">Constr</a> | </li> |
| <li><a href="#method-detail">Method</a></li> |
| </ul> |
| </div> |
| <div class="nav-list-search"><label for="search-input">SEARCH:</label> |
| <input type="text" id="search-input" value="search" disabled="disabled"> |
| <input type="reset" id="reset-button" value="reset" disabled="disabled"> |
| </div> |
| </div> |
| <!-- ========= END OF TOP NAVBAR ========= --> |
| <span class="skip-nav" id="skip-navbar-top"></span></nav> |
| </header> |
| <div class="flex-content"> |
| <main role="main"> |
| <!-- ======== START OF CLASS DATA ======== --> |
| <div class="header"> |
| <div class="sub-title"><span class="module-label-in-type">Module</span> <a href="../../../../../../module-summary.html">org.apache.jena.arq</a></div> |
| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.jena.sparql.algebra.optimize</a></div> |
| <h1 title="Class TransformOrderByDistinctApplication" class="title">Class TransformOrderByDistinctApplication</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance"><a href="../TransformCopy.html" title="class in org.apache.jena.sparql.algebra">org.apache.jena.sparql.algebra.TransformCopy</a> |
| <div class="inheritance">org.apache.jena.sparql.algebra.optimize.TransformOrderByDistinctApplication</div> |
| </div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <dl class="notes"> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><code><a href="../Transform.html" title="interface in org.apache.jena.sparql.algebra">Transform</a></code></dd> |
| </dl> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">TransformOrderByDistinctApplication</span> |
| <span class="extends-implements">extends <a href="../TransformCopy.html" title="class in org.apache.jena.sparql.algebra">TransformCopy</a></span></div> |
| <div class="block"><p> |
| Improved optimization for <code>ORDER BY</code> plus <code>DISTINCT</code> or |
| <code>REDUCED</code> combinations, see JENA-441 for original proposal and |
| discussion. |
| </p> |
| <p> |
| This optimization is enabled by default as with most ARQ optimizations and |
| may be disabled by setting the symbol |
| <a href="../../../query/ARQ.html#optOrderByDistinctApplication"><code>ARQ.optOrderByDistinctApplication</code></a> to false. |
| </p> |
| <h3>Optimization Applicability</h3> |
| <p> |
| This is a limited optimization that applies in the case where you have a |
| query that meets the following conditions: |
| </p> |
| <ul> |
| <li>Uses both <code>ORDER BY</code> and <code>DISTINCT</code> or <code>REDUCED</code> on the |
| same level of the query</li> |
| <li>There is a fixed list of variables to project i.e. not <code>SELECT *</code></li> |
| <li><code>ORDER BY</code> conditions only use variables present in the project |
| list</li> |
| </ul> |
| <p> |
| Essentially this takes algebras of the following form: |
| </p> |
| |
| <pre> |
| (distinct |
| (project (?var) |
| (order (?var) |
| ... ))) |
| </pre> |
| <p> |
| And produces algebra of the following form: |
| </p> |
| |
| <pre> |
| (order (?var) |
| (distinct |
| (project (?var) |
| ... ))) |
| </pre> |
| <p> |
| In the general case this in unsafe because it would change the semantics of |
| the query since <code>ORDER BY</code> can access variables that are not projected. |
| However if the conditions outlined are met then this optimization is safe, |
| the algebras will be semantically equivalent and the resulting form likely |
| significantly more performant, of course YMMV depending on how much data you |
| are querying. |
| </p></div> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- =========== FIELD SUMMARY =========== --> |
| <li> |
| <section class="field-summary" id="field-summary"> |
| <h2>Field Summary</h2> |
| <div class="inherited-list"> |
| <h3 id="fields-inherited-from-class-org.apache.jena.sparql.algebra.TransformCopy">Fields inherited from class org.apache.jena.sparql.algebra.<a href="../TransformCopy.html" title="class in org.apache.jena.sparql.algebra">TransformCopy</a></h3> |
| <code><a href="../TransformCopy.html#COPY_ALWAYS">COPY_ALWAYS</a>, <a href="../TransformCopy.html#COPY_ONLY_ON_CHANGE">COPY_ONLY_ON_CHANGE</a></code></div> |
| </section> |
| </li> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <li> |
| <section class="constructor-summary" id="constructor-summary"> |
| <h2>Constructor Summary</h2> |
| <div class="caption"><span>Constructors</span></div> |
| <div class="summary-table two-column-summary"> |
| <div class="table-header col-first">Constructor</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">TransformOrderByDistinctApplication</a>()</code></div> |
| <div class="col-last even-row-color"> </div> |
| </div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
| <div id="method-summary-table"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div> |
| <div id="method-summary-table.tabpanel" role="tabpanel"> |
| <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../Op.html" title="interface in org.apache.jena.sparql.algebra">Op</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#transform(org.apache.jena.sparql.algebra.op.OpDistinct,org.apache.jena.sparql.algebra.Op)" class="member-name-link">transform</a><wbr>(<a href="../op/OpDistinct.html" title="class in org.apache.jena.sparql.algebra.op">OpDistinct</a> opDistinct, |
| <a href="../Op.html" title="interface in org.apache.jena.sparql.algebra">Op</a> subOp)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../Op.html" title="interface in org.apache.jena.sparql.algebra">Op</a></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#transform(org.apache.jena.sparql.algebra.op.OpReduced,org.apache.jena.sparql.algebra.Op)" class="member-name-link">transform</a><wbr>(<a href="../op/OpReduced.html" title="class in org.apache.jena.sparql.algebra.op">OpReduced</a> opReduced, |
| <a href="../Op.html" title="interface in org.apache.jena.sparql.algebra">Op</a> subOp)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-org.apache.jena.sparql.algebra.TransformCopy">Methods inherited from class org.apache.jena.sparql.algebra.<a href="../TransformCopy.html" title="class in org.apache.jena.sparql.algebra">TransformCopy</a></h3> |
| <code><a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpAssign,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpBGP)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpConditional,org.apache.jena.sparql.algebra.Op,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpDatasetNames)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpDiff,org.apache.jena.sparql.algebra.Op,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpDisjunction,java.util.List)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpExt)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpExtend,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpFilter,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpGraph,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpGroup,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpJoin,org.apache.jena.sparql.algebra.Op,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpLabel,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpLateral,org.apache.jena.sparql.algebra.Op,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpLeftJoin,org.apache.jena.sparql.algebra.Op,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpList,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpMinus,org.apache.jena.sparql.algebra.Op,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpNull)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpOrder,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpPath)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpProcedure,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpProject,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpPropFunc,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpQuad)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpQuadBlock)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpQuadPattern)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpSequence,java.util.List)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpService,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpSlice,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpTable)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpTopN,org.apache.jena.sparql.algebra.Op)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpTriple)">transform</a>, <a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpUnion,org.apache.jena.sparql.algebra.Op,org.apache.jena.sparql.algebra.Op)">transform</a></code></div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <li> |
| <section class="constructor-details" id="constructor-detail"> |
| <h2>Constructor Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="<init>()"> |
| <h3>TransformOrderByDistinctApplication</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="element-name">TransformOrderByDistinctApplication</span>()</div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="transform(org.apache.jena.sparql.algebra.op.OpDistinct,org.apache.jena.sparql.algebra.Op)"> |
| <h3>transform</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="../Op.html" title="interface in org.apache.jena.sparql.algebra">Op</a></span> <span class="element-name">transform</span><wbr><span class="parameters">(<a href="../op/OpDistinct.html" title="class in org.apache.jena.sparql.algebra.op">OpDistinct</a> opDistinct, |
| <a href="../Op.html" title="interface in org.apache.jena.sparql.algebra">Op</a> subOp)</span></div> |
| <dl class="notes"> |
| <dt>Specified by:</dt> |
| <dd><code><a href="../Transform.html#transform(org.apache.jena.sparql.algebra.op.OpDistinct,org.apache.jena.sparql.algebra.Op)">transform</a></code> in interface <code><a href="../Transform.html" title="interface in org.apache.jena.sparql.algebra">Transform</a></code></dd> |
| <dt>Overrides:</dt> |
| <dd><code><a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpDistinct,org.apache.jena.sparql.algebra.Op)">transform</a></code> in class <code><a href="../TransformCopy.html" title="class in org.apache.jena.sparql.algebra">TransformCopy</a></code></dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="transform(org.apache.jena.sparql.algebra.op.OpReduced,org.apache.jena.sparql.algebra.Op)"> |
| <h3>transform</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="../Op.html" title="interface in org.apache.jena.sparql.algebra">Op</a></span> <span class="element-name">transform</span><wbr><span class="parameters">(<a href="../op/OpReduced.html" title="class in org.apache.jena.sparql.algebra.op">OpReduced</a> opReduced, |
| <a href="../Op.html" title="interface in org.apache.jena.sparql.algebra">Op</a> subOp)</span></div> |
| <dl class="notes"> |
| <dt>Specified by:</dt> |
| <dd><code><a href="../Transform.html#transform(org.apache.jena.sparql.algebra.op.OpReduced,org.apache.jena.sparql.algebra.Op)">transform</a></code> in interface <code><a href="../Transform.html" title="interface in org.apache.jena.sparql.algebra">Transform</a></code></dd> |
| <dt>Overrides:</dt> |
| <dd><code><a href="../TransformCopy.html#transform(org.apache.jena.sparql.algebra.op.OpReduced,org.apache.jena.sparql.algebra.Op)">transform</a></code> in class <code><a href="../TransformCopy.html" title="class in org.apache.jena.sparql.algebra">TransformCopy</a></code></dd> |
| </dl> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <!-- ========= END OF CLASS DATA ========= --> |
| </main> |
| <footer role="contentinfo"> |
| <hr> |
| <p class="legal-copy"><small>Licensed under the Apache License, Version 2.0</small></p> |
| </footer> |
| </div> |
| </div> |
| </body> |
| </html> |
