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| <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> |
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| <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> |
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| <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> |
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| <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> |
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| <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> |
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| <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> |
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| <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> |
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