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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.rel.metadata</a></div>
<h1 title="Class RelMetadataQueryBase" class="title">Class RelMetadataQueryBase</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.rel.metadata.RelMetadataQueryBase</div>
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<section class="description">
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><code><a href="RelMetadataQuery.html" title="class in org.apache.calcite.rel.metadata">RelMetadataQuery</a></code></dd>
</dl>
<hr>
<pre>public class <span class="typeNameLabel">RelMetadataQueryBase</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></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="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="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="RelMdColumnOrigins.html#SOURCE"><code>RelMdColumnOrigins.SOURCE</code></a>.
<li>Extends <a href="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="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="../../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/9/docs/api/java/util/function/Supplier.html?is-external=true" title="class or interface in java.util.function" class="externalLink"><code>Supplier</code></a> into the cluster instance. This <a href="https://docs.oracle.com/javase/9/docs/api/java/util/function/Supplier.html?is-external=true" title="class or interface in java.util.function" class="externalLink"><code>Supplier</code></a>
should return a <strong>fresh new</strong> instance.
<li>Use the cluster instance to create
<a href="../../sql2rel/SqlToRelConverter.html" title="class in org.apache.calcite.sql2rel"><code>SqlToRelConverter</code></a>.</li>
<li>Query your metadata within <a href="../../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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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><code>com.google.common.collect.Table&lt;<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>,&#8203;<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>,&#8203;<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>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#map">map</a></span></code></th>
<td class="colLast">
<div class="block">Set of active metadata queries, and cache of previous results.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>@Nullable <a href="JaninoRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata">JaninoRelMetadataProvider</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#metadataProvider">metadataProvider</a></span></code></th>
<td class="colLast">&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/ThreadLocal.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadLocal</a>&lt;@Nullable <a href="JaninoRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata">JaninoRelMetadataProvider</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#THREAD_PROVIDERS">THREAD_PROVIDERS</a></span></code></th>
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<td class="colFirst"><code>protected </code></td>
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.apache.calcite.rel.metadata.JaninoRelMetadataProvider)">RelMetadataQueryBase</a></span>&#8203;(@Nullable <a href="JaninoRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata">JaninoRelMetadataProvider</a>&nbsp;metadataProvider)</code></th>
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<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#clearCache(org.apache.calcite.rel.RelNode)">clearCache</a></span>&#8203;(<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel)</code></th>
<td class="colLast">
<div class="block">Removes cached metadata values for specified RelNode.</div>
</td>
</tr>
<tr class="rowColor" id="i1">
<td class="colFirst"><code>protected static &lt;H&gt;&nbsp;H</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#initialHandler(java.lang.Class)">initialHandler</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>&lt;H&gt;&nbsp;handlerClass)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="altColor" id="i2">
<td class="colFirst"><code>protected &lt;M extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>,&#8203;
H extends <a href="MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a>&lt;M&gt;&gt;<br>H</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#revise(java.lang.Class,org.apache.calcite.rel.metadata.MetadataDef)">revise</a></span>&#8203;(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>&lt;? extends <a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;class_,
<a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a>&lt;M&gt;&nbsp;def)</code></th>
<td class="colLast">
<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>
</td>
</tr>
</tbody>
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<h3>Methods inherited from class&nbsp;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">
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<div class="memberSignature"><span class="modifiers">public final</span>&nbsp;<span class="returnType">com.google.common.collect.Table&lt;<a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>,&#8203;<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>,&#8203;<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>&gt;</span>&nbsp;<span class="memberName">map</span></div>
<div class="block">Set of active metadata queries, and cache of previous results.</div>
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<h3><a id="metadataProvider">metadataProvider</a></h3>
<div class="memberSignature"><span class="modifiers">public final</span>&nbsp;<span class="returnType">@Nullable <a href="JaninoRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata">JaninoRelMetadataProvider</a></span>&nbsp;<span class="memberName">metadataProvider</span></div>
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<h3><a id="THREAD_PROVIDERS">THREAD_PROVIDERS</a></h3>
<div class="memberSignature"><span class="modifiers">public static final</span>&nbsp;<span class="returnType"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/ThreadLocal.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadLocal</a>&lt;@Nullable <a href="JaninoRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata">JaninoRelMetadataProvider</a>&gt;</span>&nbsp;<span class="memberName">THREAD_PROVIDERS</span></div>
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<h3><a id="&lt;init&gt;(org.apache.calcite.rel.metadata.JaninoRelMetadataProvider)">RelMetadataQueryBase</a></h3>
<div class="memberSignature"><span class="modifiers">protected</span>&nbsp;<span class="memberName">RelMetadataQueryBase</span>&#8203;(<span class="arguments">@Nullable <a href="JaninoRelMetadataProvider.html" title="class in org.apache.calcite.rel.metadata">JaninoRelMetadataProvider</a>&nbsp;metadataProvider)</span></div>
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<div class="memberSignature"><span class="modifiers">protected static</span>&nbsp;<span class="typeParameters">&lt;H&gt;</span>&nbsp;<span class="returnType">H</span>&nbsp;<span class="memberName">initialHandler</span>&#8203;(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>&lt;H&gt;&nbsp;handlerClass)</span></div>
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<h3><a id="revise(java.lang.Class,org.apache.calcite.rel.metadata.MetadataDef)">revise</a></h3>
<div class="memberSignature"><span class="modifiers">protected</span>&nbsp;<span class="typeParameters">&lt;M extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a>,&#8203;
H extends <a href="MetadataHandler.html" title="interface in org.apache.calcite.rel.metadata">MetadataHandler</a>&lt;M&gt;&gt;</span>
<span class="returnType">H</span>&nbsp;<span class="memberName">revise</span>&#8203;(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a>&lt;? extends <a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;class_,
<a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a>&lt;M&gt;&nbsp;def)</span></div>
<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><a id="clearCache(org.apache.calcite.rel.RelNode)">clearCache</a></h3>
<div class="memberSignature"><span class="modifiers">public</span>&nbsp;<span class="returnType">boolean</span>&nbsp;<span class="memberName">clearCache</span>&#8203;(<span class="arguments"><a href="../RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&nbsp;rel)</span></div>
<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>
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