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<div class="subTitle">org.apache.calcite.model</div>
<h2 title="类 JsonLattice" class="title">类 JsonLattice</h2>
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<li>org.apache.calcite.model.JsonLattice</li>
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<pre>public class <span class="typeNameLabel">JsonLattice</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></pre>
<div class="block">Element that describes a star schema and provides a framework for defining,
recognizing, and recommending materialized views at various levels of
aggregation.
<p>Occurs within <a href="../../../../org/apache/calcite/model/JsonSchema.html#lattices"><code>JsonSchema.lattices</code></a>.</div>
<dl>
<dt><span class="seeLabel">另请参阅:</span></dt>
<dd><a href="../../../../org/apache/calcite/model/JsonRoot.html" title="org.apache.calcite.model中的类"><code>Description of schema elements</code></a></dd>
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<h3>字段概要</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="字段概要表, 列表字段和解释">
<caption><span>字段</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">限定符和类型</th>
<th class="colLast" scope="col">字段和说明</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#algorithm">algorithm</a></span></code>
<div class="block">Whether to use an optimization algorithm to suggest and populate an
initial set of tiles.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#algorithmMaxMillis">algorithmMaxMillis</a></span></code>
<div class="block">Maximum time (in milliseconds) to run the algorithm.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#auto">auto</a></span></code>
<div class="block">Whether to materialize tiles on demand as queries are executed.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;<a href="../../../../org/apache/calcite/model/JsonMeasure.html" title="org.apache.calcite.model中的类">JsonMeasure</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#defaultMeasures">defaultMeasures</a></span></code>
<div class="block">List of measures that a tile should have by default.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#name">name</a></span></code>
<div class="block">The name of this lattice.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="java.lang中的类或接口">Double</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#rowCountEstimate">rowCountEstimate</a></span></code>
<div class="block">Estimated number of rows.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#sql">sql</a></span></code>
<div class="block">SQL query that defines the lattice.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#statisticProvider">statisticProvider</a></span></code>
<div class="block">Name of a class that provides estimates of the number of distinct values
in each column.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;<a href="../../../../org/apache/calcite/model/JsonTile.html" title="org.apache.calcite.model中的类">JsonTile</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#tiles">tiles</a></span></code>
<div class="block">List of materialized aggregates to create up front.</div>
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<h3>构造器概要</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="构造器概要表, 列表构造器和解释">
<caption><span>构造器</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">构造器和说明</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#JsonLattice--">JsonLattice</a></span>()</code>&nbsp;</td>
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<h3>方法概要</h3>
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<caption><span id="t0" class="activeTableTab"><span>所有方法</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">实例方法</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">具体方法</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">限定符和类型</th>
<th class="colLast" scope="col">方法和说明</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#accept-org.apache.calcite.model.ModelHandler-">accept</a></span>(<a href="../../../../org/apache/calcite/model/ModelHandler.html" title="org.apache.calcite.model中的类">ModelHandler</a>&nbsp;handler)</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#getSql--">getSql</a></span>()</code>
<div class="block">Returns the SQL query as a string, concatenating a list of lines if
necessary.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#toString--">toString</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/model/JsonLattice.html#visitChildren-org.apache.calcite.model.ModelHandler-">visitChildren</a></span>(<a href="../../../../org/apache/calcite/model/ModelHandler.html" title="org.apache.calcite.model中的类">ModelHandler</a>&nbsp;modelHandler)</code>&nbsp;</td>
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<h3>从类继承的方法&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="java.lang中的类或接口">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="java.lang中的类或接口">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="java.lang中的类或接口">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="java.lang中的类或接口">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="java.lang中的类或接口">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="java.lang中的类或接口">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="java.lang中的类或接口">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="java.lang中的类或接口">wait</a></code></li>
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<h3>字段详细资料</h3>
<a name="name">
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<h4>name</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name</pre>
<div class="block">The name of this lattice.
<p>Required.</div>
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<h4>sql</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a> sql</pre>
<div class="block">SQL query that defines the lattice.
<p>Must be a string or a list of strings (which are concatenated into a
multi-line SQL string, separated by newlines).
<p>The structure of the SQL statement, and in particular the order of
items in the FROM clause, defines the fact table, dimension tables, and
join paths for this lattice.</div>
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</ul>
<a name="auto">
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<h4>auto</h4>
<pre>public&nbsp;boolean auto</pre>
<div class="block">Whether to materialize tiles on demand as queries are executed.
<p>Optional; default is true.</div>
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<h4>algorithm</h4>
<pre>public&nbsp;boolean algorithm</pre>
<div class="block">Whether to use an optimization algorithm to suggest and populate an
initial set of tiles.
<p>Optional; default is false.</div>
</li>
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<a name="algorithmMaxMillis">
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<h4>algorithmMaxMillis</h4>
<pre>public&nbsp;long algorithmMaxMillis</pre>
<div class="block">Maximum time (in milliseconds) to run the algorithm.
<p>Optional; default is -1, meaning no timeout.
<p>When the timeout is reached, Calcite uses the best result that has
been obtained so far.</div>
</li>
</ul>
<a name="rowCountEstimate">
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<h4>rowCountEstimate</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Double.html?is-external=true" title="java.lang中的类或接口">Double</a> rowCountEstimate</pre>
<div class="block">Estimated number of rows.
<p>If null, Calcite will a query to find the real value.</div>
</li>
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<a name="statisticProvider">
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<h4>statisticProvider</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> statisticProvider</pre>
<div class="block">Name of a class that provides estimates of the number of distinct values
in each column.
<p>The class must implement the
<a href="../../../../org/apache/calcite/materialize/LatticeStatisticProvider.html" title="org.apache.calcite.materialize中的接口"><code>LatticeStatisticProvider</code></a> interface.
<p>Or, you can use a class name plus a static field, for example
"org.apache.calcite.materialize.Lattices#CACHING_SQL_STATISTIC_PROVIDER".
<p>If not set, Calcite will generate and execute a SQL query to find the
real value, and cache the results.</div>
</li>
</ul>
<a name="tiles">
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<h4>tiles</h4>
<pre>public final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;<a href="../../../../org/apache/calcite/model/JsonTile.html" title="org.apache.calcite.model中的类">JsonTile</a>&gt; tiles</pre>
<div class="block">List of materialized aggregates to create up front.</div>
</li>
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<a name="defaultMeasures">
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<h4>defaultMeasures</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;<a href="../../../../org/apache/calcite/model/JsonMeasure.html" title="org.apache.calcite.model中的类">JsonMeasure</a>&gt; defaultMeasures</pre>
<div class="block">List of measures that a tile should have by default.
<p>A tile can define its own measures, including measures not in this list.
<p>Optional. The default list is just "count(*)".</div>
</li>
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<h3>构造器详细资料</h3>
<a name="JsonLattice--">
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<h4>JsonLattice</h4>
<pre>public&nbsp;JsonLattice()</pre>
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<h4>accept</h4>
<pre>public&nbsp;void&nbsp;accept(<a href="../../../../org/apache/calcite/model/ModelHandler.html" title="org.apache.calcite.model中的类">ModelHandler</a>&nbsp;handler)</pre>
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<a name="toString--">
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<h4>toString</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>&nbsp;toString()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="java.lang中的类或接口">toString</a></code>&nbsp;在类中&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">Object</a></code></dd>
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<h4>getSql</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>&nbsp;getSql()</pre>
<div class="block">Returns the SQL query as a string, concatenating a list of lines if
necessary.</div>
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<h4>visitChildren</h4>
<pre>public&nbsp;void&nbsp;visitChildren(<a href="../../../../org/apache/calcite/model/ModelHandler.html" title="org.apache.calcite.model中的类">ModelHandler</a>&nbsp;modelHandler)</pre>
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