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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.statistic</a></div> |
| <h1 title="Class QuerySqlStatisticProvider" class="title">Class QuerySqlStatisticProvider</h1> |
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| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">java.lang.Object</a> |
| <div class="inheritance">org.apache.calcite.statistic.QuerySqlStatisticProvider</div> |
| </div> |
| <section class="description"> |
| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><code><a href="../materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public class <span class="typeNameLabel">QuerySqlStatisticProvider</span> |
| extends <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a> |
| implements <a href="../materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></pre> |
| <div class="block">Implementation of <a href="../materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize"><code>SqlStatisticProvider</code></a> that generates and executes |
| SQL queries.</div> |
| </section> |
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| <thead> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Field</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="../materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#SILENT_CACHING_INSTANCE">SILENT_CACHING_INSTANCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Instance that uses SQL to compute statistics, |
| does not log SQL statements, |
| and caches up to 1,024 results for up to 30 minutes.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="../materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#VERBOSE_CACHING_INSTANCE">VERBOSE_CACHING_INSTANCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">As <a href="#SILENT_CACHING_INSTANCE"><code>SILENT_CACHING_INSTANCE</code></a> but prints SQL statements to |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/System.html?is-external=true#out" title="class or interface in java.lang" class="externalLink"><code>System.out</code></a>.</div> |
| </td> |
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| <th class="colFirst" scope="col">Constructor</th> |
| <th class="colLast" scope="col">Description</th> |
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| <tbody> |
| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.util.function.Consumer)">QuerySqlStatisticProvider</a></span>​(<a href="https://docs.oracle.com/javase/9/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function" class="externalLink">Consumer</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>> sqlConsumer)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a QuerySqlStatisticProvider.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <th class="colLast" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor" id="i0"> |
| <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, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>> fromColumns, |
| <a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> toTable, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>> 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 class="rowColor" id="i1"> |
| <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, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>> 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 class="altColor" id="i2"> |
| <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> |
| <tr class="rowColor" id="i3"> |
| <td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toSql(org.apache.calcite.rel.RelNode,org.apache.calcite.sql.SqlDialect)">toSql</a></span>​(<a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel, |
| <a href="../sql/SqlDialect.html" title="class in org.apache.calcite.sql">SqlDialect</a> dialect)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="inheritedList"> |
| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></h3> |
| <a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink">toString</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
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| <!-- ============ FIELD DETAIL =========== --> |
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| <h3><a id="SILENT_CACHING_INSTANCE">SILENT_CACHING_INSTANCE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="../materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></span> <span class="memberName">SILENT_CACHING_INSTANCE</span></div> |
| <div class="block">Instance that uses SQL to compute statistics, |
| does not log SQL statements, |
| and caches up to 1,024 results for up to 30 minutes. |
| (That period should be sufficient for the |
| duration of Calcite's tests, and many other purposes.)</div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="VERBOSE_CACHING_INSTANCE">VERBOSE_CACHING_INSTANCE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="../materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></span> <span class="memberName">VERBOSE_CACHING_INSTANCE</span></div> |
| <div class="block">As <a href="#SILENT_CACHING_INSTANCE"><code>SILENT_CACHING_INSTANCE</code></a> but prints SQL statements to |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/System.html?is-external=true#out" title="class or interface in java.lang" class="externalLink"><code>System.out</code></a>.</div> |
| </section> |
| </li> |
| </ul> |
| </section> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <h2>Constructor Details</h2> |
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| <h3><a id="<init>(java.util.function.Consumer)">QuerySqlStatisticProvider</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="memberName">QuerySqlStatisticProvider</span>​(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function" class="externalLink">Consumer</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>> sqlConsumer)</span></div> |
| <div class="block">Creates a QuerySqlStatisticProvider.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>sqlConsumer</code> - Called when each SQL statement is generated</dd> |
| </dl> |
| </section> |
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| <h2>Method Details</h2> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="tableCardinality(org.apache.calcite.plan.RelOptTable)">tableCardinality</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType">double</span> <span class="memberName">tableCardinality</span>​(<span class="arguments"><a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> table)</span></div> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../materialize/SqlStatisticProvider.html#tableCardinality(org.apache.calcite.plan.RelOptTable)">SqlStatisticProvider</a></code></span></div> |
| <div class="block">Returns an estimate of the number of rows in <code>table</code>.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../materialize/SqlStatisticProvider.html#tableCardinality(org.apache.calcite.plan.RelOptTable)">tableCardinality</a></code> in interface <code><a href="../materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></code></dd> |
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| <section class="detail"> |
| <h3><a id="isForeignKey(org.apache.calcite.plan.RelOptTable,java.util.List,org.apache.calcite.plan.RelOptTable,java.util.List)">isForeignKey</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType">boolean</span> <span class="memberName">isForeignKey</span>​(<span class="arguments"><a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> fromTable, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>> fromColumns, |
| <a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> toTable, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>> toColumns)</span></div> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../materialize/SqlStatisticProvider.html#isForeignKey(org.apache.calcite.plan.RelOptTable,java.util.List,org.apache.calcite.plan.RelOptTable,java.util.List)">SqlStatisticProvider</a></code></span></div> |
| <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="../materialize/SqlStatisticProvider.html#isKey(org.apache.calcite.plan.RelOptTable,java.util.List)"><code>SqlStatisticProvider.isKey(org.apache.calcite.plan.RelOptTable, java.util.List<java.lang.Integer>)</code></a>.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../materialize/SqlStatisticProvider.html#isForeignKey(org.apache.calcite.plan.RelOptTable,java.util.List,org.apache.calcite.plan.RelOptTable,java.util.List)">isForeignKey</a></code> in interface <code><a href="../materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></code></dd> |
| </dl> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="isKey(org.apache.calcite.plan.RelOptTable,java.util.List)">isKey</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType">boolean</span> <span class="memberName">isKey</span>​(<span class="arguments"><a href="../plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> table, |
| <a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>> columns)</span></div> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../materialize/SqlStatisticProvider.html#isKey(org.apache.calcite.plan.RelOptTable,java.util.List)">SqlStatisticProvider</a></code></span></div> |
| <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> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../materialize/SqlStatisticProvider.html#isKey(org.apache.calcite.plan.RelOptTable,java.util.List)">isKey</a></code> in interface <code><a href="../materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></code></dd> |
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| <h3><a id="toSql(org.apache.calcite.rel.RelNode,org.apache.calcite.sql.SqlDialect)">toSql</a></h3> |
| <div class="memberSignature"><span class="modifiers">protected</span> <span class="returnType"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></span> <span class="memberName">toSql</span>​(<span class="arguments"><a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel, |
| <a href="../sql/SqlDialect.html" title="class in org.apache.calcite.sql">SqlDialect</a> dialect)</span></div> |
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