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| <div class="subTitle">org.apache.calcite.statistic</div> |
| <h2 title="Class QuerySqlStatisticProvider" class="title">Class QuerySqlStatisticProvider</h2> |
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| <ul class="inheritance"> |
| <li>org.apache.calcite.statistic.QuerySqlStatisticProvider</li> |
| </ul> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../org/apache/calcite/materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></dd> |
| </dl> |
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| <pre>public class <span class="typeNameLabel">QuerySqlStatisticProvider</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements <a href="../../../../org/apache/calcite/materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></pre> |
| <div class="block">Implementation of <a href="../../../../org/apache/calcite/materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize"><code>SqlStatisticProvider</code></a> that generates and executes |
| SQL queries.</div> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/calcite/materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/statistic/QuerySqlStatisticProvider.html#SILENT_CACHING_INSTANCE">SILENT_CACHING_INSTANCE</a></span></code> |
| <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="../../../../org/apache/calcite/materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/statistic/QuerySqlStatisticProvider.html#VERBOSE_CACHING_INSTANCE">VERBOSE_CACHING_INSTANCE</a></span></code> |
| <div class="block">As <a href="../../../../org/apache/calcite/statistic/QuerySqlStatisticProvider.html#SILENT_CACHING_INSTANCE"><code>SILENT_CACHING_INSTANCE</code></a> but prints SQL statements to |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/System.html?is-external=true#out" title="class or interface in java.lang"><code>System.out</code></a>.</div> |
| </td> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/statistic/QuerySqlStatisticProvider.html#QuerySqlStatisticProvider-java.util.function.Consumer-">QuerySqlStatisticProvider</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function">Consumer</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> sqlConsumer)</code> |
| <div class="block">Creates a QuerySqlStatisticProvider.</div> |
| </td> |
| </tr> |
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| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/statistic/QuerySqlStatisticProvider.html#isForeignKey-org.apache.calcite.plan.RelOptTable-java.util.List-org.apache.calcite.plan.RelOptTable-java.util.List-">isForeignKey</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> fromTable, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> fromColumns, |
| <a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> toTable, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> toColumns)</code> |
| <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> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/statistic/QuerySqlStatisticProvider.html#isKey-org.apache.calcite.plan.RelOptTable-java.util.List-">isKey</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> table, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> columns)</code> |
| <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> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/statistic/QuerySqlStatisticProvider.html#tableCardinality-org.apache.calcite.plan.RelOptTable-">tableCardinality</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> table)</code> |
| <div class="block">Returns an estimate of the number of rows in <code>table</code>.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/statistic/QuerySqlStatisticProvider.html#toSql-org.apache.calcite.rel.RelNode-org.apache.calcite.sql.SqlDialect-">toSql</a></span>(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel, |
| <a href="../../../../org/apache/calcite/sql/SqlDialect.html" title="class in org.apache.calcite.sql">SqlDialect</a> dialect)</code> </td> |
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| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
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| <h3>Field Detail</h3> |
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| <h4>SILENT_CACHING_INSTANCE</h4> |
| <pre>public static final <a href="../../../../org/apache/calcite/materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a> SILENT_CACHING_INSTANCE</pre> |
| <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> |
| </li> |
| </ul> |
| <a name="VERBOSE_CACHING_INSTANCE"> |
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| </a> |
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| <h4>VERBOSE_CACHING_INSTANCE</h4> |
| <pre>public static final <a href="../../../../org/apache/calcite/materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a> VERBOSE_CACHING_INSTANCE</pre> |
| <div class="block">As <a href="../../../../org/apache/calcite/statistic/QuerySqlStatisticProvider.html#SILENT_CACHING_INSTANCE"><code>SILENT_CACHING_INSTANCE</code></a> but prints SQL statements to |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/System.html?is-external=true#out" title="class or interface in java.lang"><code>System.out</code></a>.</div> |
| </li> |
| </ul> |
| </li> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <li class="blockList"><a name="constructor.detail"> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="QuerySqlStatisticProvider-java.util.function.Consumer-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>QuerySqlStatisticProvider</h4> |
| <pre>public QuerySqlStatisticProvider(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function">Consumer</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> sqlConsumer)</pre> |
| <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> |
| </li> |
| </ul> |
| </li> |
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| <h3>Method Detail</h3> |
| <a name="tableCardinality-org.apache.calcite.plan.RelOptTable-"> |
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| </a> |
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| <li class="blockList"> |
| <h4>tableCardinality</h4> |
| <pre>public double tableCardinality(<a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> table)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../org/apache/calcite/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="../../../../org/apache/calcite/materialize/SqlStatisticProvider.html#tableCardinality-org.apache.calcite.plan.RelOptTable-">tableCardinality</a></code> in interface <code><a href="../../../../org/apache/calcite/materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="isForeignKey-org.apache.calcite.plan.RelOptTable-java.util.List-org.apache.calcite.plan.RelOptTable-java.util.List-"> |
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| <h4>isForeignKey</h4> |
| <pre>public boolean isForeignKey(<a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> fromTable, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> fromColumns, |
| <a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> toTable, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> toColumns)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../org/apache/calcite/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="../../../../org/apache/calcite/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="../../../../org/apache/calcite/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="../../../../org/apache/calcite/materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="isKey-org.apache.calcite.plan.RelOptTable-java.util.List-"> |
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| <h4>isKey</h4> |
| <pre>public boolean isKey(<a href="../../../../org/apache/calcite/plan/RelOptTable.html" title="interface in org.apache.calcite.plan">RelOptTable</a> table, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> columns)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../org/apache/calcite/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="../../../../org/apache/calcite/materialize/SqlStatisticProvider.html#isKey-org.apache.calcite.plan.RelOptTable-java.util.List-">isKey</a></code> in interface <code><a href="../../../../org/apache/calcite/materialize/SqlStatisticProvider.html" title="interface in org.apache.calcite.materialize">SqlStatisticProvider</a></code></dd> |
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| <pre>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> toSql(<a href="../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a> rel, |
| <a href="../../../../org/apache/calcite/sql/SqlDialect.html" title="class in org.apache.calcite.sql">SqlDialect</a> dialect)</pre> |
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