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<div class="subTitle">org.apache.calcite.rel.metadata</div>
<h2 title="Class RelMetadataQueryBase" class="title">Class RelMetadataQueryBase</h2>
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<ul class="inheritance">
<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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<ul class="inheritance">
<li>org.apache.calcite.rel.metadata.RelMetadataQueryBase</li>
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<div class="description">
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<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQuery.html" title="class in org.apache.calcite.rel.metadata">RelMetadataQuery</a></dd>
</dl>
<hr>
<br>
<pre>public class <span class="typeNameLabel">RelMetadataQueryBase</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></pre>
<div class="block">Base class for the RelMetadataQuery that uses the metadata handler class
generated by the Janino.
<p>To add a new implementation to this interface, follow
these steps:
<ol>
<li>Extends <a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQuery.html" title="class in org.apache.calcite.rel.metadata"><code>RelMetadataQuery</code></a> (name it MyRelMetadataQuery for example)
to reuse the Calcite builtin metadata query interfaces. In this class, define all the
extended Handlers for your metadata and implement the metadata query interfaces.
<li>Write your customized provider class <code>RelMdXyz</code>. Follow
the pattern from an existing class such as <a href="../../../../../org/apache/calcite/rel/metadata/RelMdColumnOrigins.html" title="class in org.apache.calcite.rel.metadata"><code>RelMdColumnOrigins</code></a>,
overloading on all of the logical relational expressions to which the query
applies.
<li>Add a <code>SOURCE</code> static member to each of your provider class, similar to
<a href="../../../../../org/apache/calcite/rel/metadata/RelMdColumnOrigins.html#SOURCE"><code>RelMdColumnOrigins.SOURCE</code></a>.
<li>Extends <a href="../../../../../org/apache/calcite/rel/metadata/DefaultRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata"><code>DefaultRelMetadataProvider</code></a> (name it MyRelMetadataProvider for example)
and supplement the "SOURCE"s into the builtin list
(This is not required, use <a href="../../../../../org/apache/calcite/rel/metadata/ChainedRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata"><code>ChainedRelMetadataProvider</code></a> to chain your customized
"SOURCE"s with default ones also works).
<li>Set <code>MyRelMetadataProvider</code> into the cluster instance.
<li>Use
<a href="../../../../../org/apache/calcite/plan/RelOptCluster.html#setMetadataQuerySupplier-java.util.function.Supplier-"><code>RelOptCluster.setMetadataQuerySupplier(Supplier)</code></a>
to set the metadata query <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Supplier.html?is-external=true" title="class or interface in java.util.function"><code>Supplier</code></a> into the cluster instance. This <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Supplier.html?is-external=true" title="class or interface in java.util.function"><code>Supplier</code></a>
should return a <strong>fresh new</strong> instance.
<li>Use the cluster instance to create
<a href="../../../../../org/apache/calcite/sql2rel/SqlToRelConverter.html" title="class in org.apache.calcite.sql2rel"><code>SqlToRelConverter</code></a>.</li>
<li>Query your metadata within <a href="../../../../../org/apache/calcite/plan/RelOptRuleCall.html" title="class in org.apache.calcite.plan"><code>RelOptRuleCall</code></a> with the
interfaces you defined in <code>MyRelMetadataQuery</code>.
</ol></div>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>com.google.common.collect.Table&lt;<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>,<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/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQueryBase.html#map">map</a></span></code>
<div class="block">Set of active metadata queries, and cache of previous results.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/rel/metadata/JaninoRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata">JaninoRelMetadataProvider</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQueryBase.html#metadataProvider">metadataProvider</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ThreadLocal.html?is-external=true" title="class or interface in java.lang">ThreadLocal</a>&lt;<a href="../../../../../org/apache/calcite/rel/metadata/JaninoRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata">JaninoRelMetadataProvider</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQueryBase.html#THREAD_PROVIDERS">THREAD_PROVIDERS</a></span></code>&nbsp;</td>
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<th class="colLast" scope="col">Constructor and Description</th>
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<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQueryBase.html#RelMetadataQueryBase-org.apache.calcite.rel.metadata.JaninoRelMetadataProvider-">RelMetadataQueryBase</a></span>(<a href="../../../../../org/apache/calcite/rel/metadata/JaninoRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata">JaninoRelMetadataProvider</a>&nbsp;metadataProvider)</code>&nbsp;</td>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQueryBase.html#clearCache-org.apache.calcite.rel.RelNode-">clearCache</a></span>(<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel)</code>
<div class="block">Removes cached metadata values for specified RelNode.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected static &lt;H&gt;&nbsp;H</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQueryBase.html#initialHandler-java.lang.Class-">initialHandler</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;H&gt;&nbsp;handlerClass)</code>&nbsp;</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>protected &lt;M extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>,H extends <a href="../../../../../org/apache/calcite/rel/metadata/MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a>&lt;M&gt;&gt;<br>H</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/RelMetadataQueryBase.html#revise-java.lang.Class-org.apache.calcite.rel.metadata.MetadataDef-">revise</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;? extends <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;class_,
<a href="../../../../../org/apache/calcite/rel/metadata/MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a>&lt;M&gt;&nbsp;def)</code>
<div class="block">Re-generates the handler for a given kind of metadata, adding support for
<code>class_</code> if it is not already present.</div>
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<h3>Methods inherited from class&nbsp;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>
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<h4>map</h4>
<pre>public final&nbsp;com.google.common.collect.Table&lt;<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>,<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/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&gt; map</pre>
<div class="block">Set of active metadata queries, and cache of previous results.</div>
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<a name="metadataProvider">
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<h4>metadataProvider</h4>
<pre>public final&nbsp;<a href="../../../../../org/apache/calcite/rel/metadata/JaninoRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata">JaninoRelMetadataProvider</a> metadataProvider</pre>
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<pre>public static final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ThreadLocal.html?is-external=true" title="class or interface in java.lang">ThreadLocal</a>&lt;<a href="../../../../../org/apache/calcite/rel/metadata/JaninoRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata">JaninoRelMetadataProvider</a>&gt; THREAD_PROVIDERS</pre>
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<h4>RelMetadataQueryBase</h4>
<pre>protected&nbsp;RelMetadataQueryBase(<a href="../../../../../org/apache/calcite/rel/metadata/JaninoRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata">JaninoRelMetadataProvider</a>&nbsp;metadataProvider)</pre>
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<h4>initialHandler</h4>
<pre>protected static&nbsp;&lt;H&gt;&nbsp;H&nbsp;initialHandler(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;H&gt;&nbsp;handlerClass)</pre>
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<h4>revise</h4>
<pre>protected&nbsp;&lt;M extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>,H extends <a href="../../../../../org/apache/calcite/rel/metadata/MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a>&lt;M&gt;&gt;&nbsp;H&nbsp;revise(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;? extends <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;class_,
<a href="../../../../../org/apache/calcite/rel/metadata/MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a>&lt;M&gt;&nbsp;def)</pre>
<div class="block">Re-generates the handler for a given kind of metadata, adding support for
<code>class_</code> if it is not already present.</div>
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<pre>public&nbsp;boolean&nbsp;clearCache(<a href="../../../../../org/apache/calcite/rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel)</pre>
<div class="block">Removes cached metadata values for specified RelNode.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rel</code> - RelNode whose cached metadata should be removed</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if cache for the provided RelNode was not empty</dd>
</dl>
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