| <!DOCTYPE HTML> |
| <!-- NewPage --> |
| <html lang="en"> |
| <head> |
| <!-- Generated by javadoc --> |
| <title>SqlStatisticProvider (Apache Calcite API)</title> |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> |
| <link rel="stylesheet" type="text/css" href="../../../../stylesheet.css" title="Style"> |
| <link rel="stylesheet" type="text/css" href="../../../../jquery/jquery-ui.css" title="Style"> |
| <script type="text/javascript" src="../../../../script.js"></script> |
| <script type="text/javascript" src="../../../../jquery/jszip/dist/jszip.min.js"></script> |
| <script type="text/javascript" src="../../../../jquery/jszip-utils/dist/jszip-utils.min.js"></script> |
| <!--[if IE]> |
| <script type="text/javascript" src="../../../../jquery/jszip-utils/dist/jszip-utils-ie.min.js"></script> |
| <![endif]--> |
| <script type="text/javascript" src="../../../../jquery/jquery-3.3.1.js"></script> |
| <script type="text/javascript" src="../../../../jquery/jquery-migrate-3.0.1.js"></script> |
| <script type="text/javascript" src="../../../../jquery/jquery-ui.js"></script> |
| </head> |
| <body> |
| <script type="text/javascript"><!-- |
| try { |
| if (location.href.indexOf('is-external=true') == -1) { |
| parent.document.title="SqlStatisticProvider (Apache Calcite API)"; |
| } |
| } |
| catch(err) { |
| } |
| //--> |
| var data = {"i0":6,"i1":6,"i2":6}; |
| var tabs = {65535:["t0","All Methods"],2:["t2","Instance Methods"],4:["t3","Abstract Methods"]}; |
| var altColor = "altColor"; |
| var rowColor = "rowColor"; |
| var tableTab = "tableTab"; |
| var activeTableTab = "activeTableTab"; |
| var pathtoroot = "../../../../"; |
| var useModuleDirectories = true; |
| loadScripts(document, 'script');</script> |
| <noscript> |
| <div>JavaScript is disabled on your browser.</div> |
| </noscript> |
| <header role="banner"> |
| <nav role="navigation"> |
| <div class="fixedNav"> |
| <!-- ========= START OF TOP NAVBAR ======= --> |
| <div class="topNav"><a id="navbar.top"> |
| <!-- --> |
| </a> |
| <div class="skipNav"><a href="#skip.navbar.top" title="Skip navigation links">Skip navigation links</a></div> |
| <a id="navbar.top.firstrow"> |
| <!-- --> |
| </a> |
| <ul class="navList" title="Navigation"> |
| <li><a href="../../../../index.html">Overview</a></li> |
| <li><a href="package-summary.html">Package</a></li> |
| <li class="navBarCell1Rev">Class</li> |
| <li><a href="class-use/SqlStatisticProvider.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">Help</a></li> |
| </ul> |
| </div> |
| <div class="subNav"> |
| <ul class="navList" id="allclasses_navbar_top"> |
| <li><a href="../../../../allclasses.html">All Classes</a></li> |
| </ul> |
| <ul class="navListSearch"> |
| <li><label for="search">SEARCH:</label> |
| <input type="text" id="search" value="search" disabled="disabled"> |
| <input type="reset" id="reset" value="reset" disabled="disabled"> |
| </li> |
| </ul> |
| <div> |
| <script type="text/javascript"><!-- |
| allClassesLink = document.getElementById("allclasses_navbar_top"); |
| if(window==top) { |
| allClassesLink.style.display = "block"; |
| } |
| else { |
| allClassesLink.style.display = "none"; |
| } |
| //--> |
| </script> |
| <noscript> |
| <div>JavaScript is disabled on your browser.</div> |
| </noscript> |
| </div> |
| <div> |
| <ul class="subNavList"> |
| <li>Summary: </li> |
| <li>Nested | </li> |
| <li>Field | </li> |
| <li>Constr | </li> |
| <li><a href="#method.summary">Method</a></li> |
| </ul> |
| <ul class="subNavList"> |
| <li>Detail: </li> |
| <li>Field | </li> |
| <li>Constr | </li> |
| <li><a href="#method.detail">Method</a></li> |
| </ul> |
| </div> |
| <a id="skip.navbar.top"> |
| <!-- --> |
| </a></div> |
| <!-- ========= END OF TOP NAVBAR ========= --> |
| </div> |
| <div class="navPadding"> </div> |
| <script type="text/javascript"><!-- |
| $('.navPadding').css('padding-top', $('.fixedNav').css("height")); |
| //--> |
| </script> |
| </nav> |
| </header> |
| <!-- ======== START OF CLASS DATA ======== --> |
| <main role="main"> |
| <div class="header"> |
| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.materialize</a></div> |
| <h2 title="Interface SqlStatisticProvider" class="title">Interface SqlStatisticProvider</h2> |
| </div> |
| <div class="contentContainer"> |
| <div class="description"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="../statistic/CachingSqlStatisticProvider.html" title="class in org.apache.calcite.statistic">CachingSqlStatisticProvider</a></code>, <code><a href="../statistic/MapSqlStatisticProvider.html" title="enum in org.apache.calcite.statistic">MapSqlStatisticProvider</a></code>, <code><a href="../statistic/QuerySqlStatisticProvider.html" title="class in org.apache.calcite.statistic">QuerySqlStatisticProvider</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public interface <span class="typeNameLabel">SqlStatisticProvider</span></pre> |
| <div class="block">Estimates row counts for tables and columns, and whether combinations of |
| columns form primary/unique and foreign keys. |
| |
| <p>Unlike <a href="LatticeStatisticProvider.html" title="interface in org.apache.calcite.materialize"><code>LatticeStatisticProvider</code></a>, works on raw tables and columns |
| and does not need a <a href="Lattice.html" title="class in org.apache.calcite.materialize"><code>Lattice</code></a>. |
| |
| <p>It uses <a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan"><code>RelOptTable</code></a> because that contains |
| enough information to generate and execute SQL, while not being tied to a |
| lattice. |
| |
| <p>The main implementation, |
| <a href="../statistic/QuerySqlStatisticProvider.html" title="class in org.apache.calcite.statistic"><code>QuerySqlStatisticProvider</code></a>, executes |
| queries on a populated database. Implementations that use database statistics |
| (from <code>ANALYZE TABLE</code>, etc.) and catalog information (e.g. primary and |
| foreign key constraints) would also be possible.</div> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="method.summary"> |
| <!-- --> |
| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isForeignKey(org.apache.calcite.plan.RelOptTable,java.util.List,org.apache.calcite.plan.RelOptTable,java.util.List)">isForeignKey</a></span>​(<a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> fromTable, |
| java.util.List<java.lang.Integer> fromColumns, |
| <a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> toTable, |
| java.util.List<java.lang.Integer> toColumns)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns whether a join is a foreign key; that is, whether every row in |
| the referencing table is matched by at least one row in the referenced |
| table.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isKey(org.apache.calcite.plan.RelOptTable,java.util.List)">isKey</a></span>​(<a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> table, |
| java.util.List<java.lang.Integer> columns)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns whether a collection of columns is a unique (or primary) key.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#tableCardinality(org.apache.calcite.plan.RelOptTable)">tableCardinality</a></span>​(<a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> table)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns an estimate of the number of rows in <code>table</code>.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <section role="region"> |
| <ul class="blockList"> |
| <li class="blockList"><a id="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a id="tableCardinality(org.apache.calcite.plan.RelOptTable)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>tableCardinality</h4> |
| <pre class="methodSignature">double tableCardinality​(<a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> table)</pre> |
| <div class="block">Returns an estimate of the number of rows in <code>table</code>.</div> |
| </li> |
| </ul> |
| <a id="isForeignKey(org.apache.calcite.plan.RelOptTable,java.util.List,org.apache.calcite.plan.RelOptTable,java.util.List)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isForeignKey</h4> |
| <pre class="methodSignature">boolean isForeignKey​(<a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> fromTable, |
| java.util.List<java.lang.Integer> fromColumns, |
| <a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> toTable, |
| java.util.List<java.lang.Integer> toColumns)</pre> |
| <div class="block">Returns whether a join is a foreign key; that is, whether every row in |
| the referencing table is matched by at least one row in the referenced |
| table. |
| |
| <p>For example, <code>isForeignKey(EMP, [DEPTNO], DEPT, [DEPTNO])</code> |
| returns true. |
| |
| <p>To change "at least one" to "exactly one", you also need to call |
| <a href="#isKey(org.apache.calcite.plan.RelOptTable,java.util.List)"><code>isKey(org.apache.calcite.plan.RelOptTable, java.util.List<java.lang.Integer>)</code></a>.</div> |
| </li> |
| </ul> |
| <a id="isKey(org.apache.calcite.plan.RelOptTable,java.util.List)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>isKey</h4> |
| <pre class="methodSignature">boolean isKey​(<a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> table, |
| java.util.List<java.lang.Integer> columns)</pre> |
| <div class="block">Returns whether a collection of columns is a unique (or primary) key. |
| |
| <p>For example, <code>isKey(EMP, [DEPTNO]</code> returns true; |
| <p>For example, <code>isKey(DEPT, [DEPTNO]</code> returns false.</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </main> |
| <!-- ========= END OF CLASS DATA ========= --> |
| <footer role="contentinfo"> |
| <nav role="navigation"> |
| <!-- ======= START OF BOTTOM NAVBAR ====== --> |
| <div class="bottomNav"><a id="navbar.bottom"> |
| <!-- --> |
| </a> |
| <div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div> |
| <a id="navbar.bottom.firstrow"> |
| <!-- --> |
| </a> |
| <ul class="navList" title="Navigation"> |
| <li><a href="../../../../index.html">Overview</a></li> |
| <li><a href="package-summary.html">Package</a></li> |
| <li class="navBarCell1Rev">Class</li> |
| <li><a href="class-use/SqlStatisticProvider.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">Help</a></li> |
| </ul> |
| </div> |
| <div class="subNav"> |
| <ul class="navList" id="allclasses_navbar_bottom"> |
| <li><a href="../../../../allclasses.html">All Classes</a></li> |
| </ul> |
| <div> |
| <script type="text/javascript"><!-- |
| allClassesLink = document.getElementById("allclasses_navbar_bottom"); |
| if(window==top) { |
| allClassesLink.style.display = "block"; |
| } |
| else { |
| allClassesLink.style.display = "none"; |
| } |
| //--> |
| </script> |
| <noscript> |
| <div>JavaScript is disabled on your browser.</div> |
| </noscript> |
| </div> |
| <div> |
| <ul class="subNavList"> |
| <li>Summary: </li> |
| <li>Nested | </li> |
| <li>Field | </li> |
| <li>Constr | </li> |
| <li><a href="#method.summary">Method</a></li> |
| </ul> |
| <ul class="subNavList"> |
| <li>Detail: </li> |
| <li>Field | </li> |
| <li>Constr | </li> |
| <li><a href="#method.detail">Method</a></li> |
| </ul> |
| </div> |
| <a id="skip.navbar.bottom"> |
| <!-- --> |
| </a></div> |
| <!-- ======== END OF BOTTOM NAVBAR ======= --> |
| </nav> |
| <p class="legalCopy"><small>Copyright © 2012–2019 <a href="https://www.apache.org/">The Apache Software Foundation</a>. All rights reserved.</small></p> |
| </footer> |
| </body> |
| </html> |