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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.plan</a></div>
<h2 title="Class Convention.Impl" class="title">Class Convention.Impl</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li>org.apache.calcite.plan.Convention.Impl</li>
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<dt>All Implemented Interfaces:</dt>
<dd><code><a href="Convention.html" title="interface in org.apache.calcite.plan">Convention</a></code>, <code><a href="RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a></code></dd>
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<dt>Direct Known Subclasses:</dt>
<dd><code><a href="../adapter/jdbc/JdbcConvention.html" title="class in org.apache.calcite.adapter.jdbc">JdbcConvention</a></code></dd>
</dl>
<dl>
<dt>Enclosing interface:</dt>
<dd><a href="Convention.html" title="interface in org.apache.calcite.plan">Convention</a></dd>
</dl>
<hr>
<pre>public static class <span class="typeNameLabel">Convention.Impl</span>
extends java.lang.Object
implements <a href="Convention.html" title="interface in org.apache.calcite.plan">Convention</a></pre>
<div class="block">Default implementation.</div>
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<h3>Nested classes/interfaces inherited from interface&nbsp;org.apache.calcite.plan.<a href="Convention.html" title="interface in org.apache.calcite.plan">Convention</a></h3>
<code><a href="Convention.Impl.html" title="class in org.apache.calcite.plan">Convention.Impl</a></code></li>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Field</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><code>private java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#name">name</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>private java.lang.Class&lt;? extends <a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#relClass">relClass</a></span></code></th>
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<h3>Fields inherited from interface&nbsp;org.apache.calcite.plan.<a href="Convention.html" title="interface in org.apache.calcite.plan">Convention</a></h3>
<code><a href="Convention.html#NONE">NONE</a></code></li>
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<th class="colFirst" scope="col">Constructor</th>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.String,java.lang.Class)">Impl</a></span>&#8203;(java.lang.String&nbsp;name,
java.lang.Class&lt;? extends <a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;relClass)</code></th>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
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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="#canConvertConvention(org.apache.calcite.plan.Convention)">canConvertConvention</a></span>&#8203;(<a href="Convention.html" title="interface in org.apache.calcite.plan">Convention</a>&nbsp;toConvention)</code></th>
<td class="colLast">
<div class="block">Returns whether we should convert from this convention to
<code>toConvention</code>.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>java.lang.Class</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getInterface()">getInterface</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getName()">getName</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="RelTraitDef.html" title="class in org.apache.calcite.plan">RelTraitDef</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTraitDef()">getTraitDef</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the RelTraitDef that defines this RelTrait.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#register(org.apache.calcite.plan.RelOptPlanner)">register</a></span>&#8203;(<a href="RelOptPlanner.html" title="interface in org.apache.calcite.plan">RelOptPlanner</a>&nbsp;planner)</code></th>
<td class="colLast">
<div class="block">Registers a trait instance with the planner.</div>
</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#satisfies(org.apache.calcite.plan.RelTrait)">satisfies</a></span>&#8203;(<a href="RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait)</code></th>
<td class="colLast">
<div class="block">Returns whether this trait satisfies a given trait.</div>
</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString()">toString</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns a succinct name for this trait.</div>
</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#useAbstractConvertersForConversion(org.apache.calcite.plan.RelTraitSet,org.apache.calcite.plan.RelTraitSet)">useAbstractConvertersForConversion</a></span>&#8203;(<a href="RelTraitSet.html" title="class in org.apache.calcite.plan">RelTraitSet</a>&nbsp;fromTraits,
<a href="RelTraitSet.html" title="class in org.apache.calcite.plan">RelTraitSet</a>&nbsp;toTraits)</code></th>
<td class="colLast">
<div class="block">Returns whether we should convert from this trait set to the other trait
set.</div>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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<h3>Methods inherited from interface&nbsp;org.apache.calcite.plan.<a href="RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a></h3>
<code><a href="RelTrait.html#equals(java.lang.Object)">equals</a>, <a href="RelTrait.html#hashCode()">hashCode</a></code></li>
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<h4>name</h4>
<pre>private final&nbsp;java.lang.String name</pre>
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<h4>relClass</h4>
<pre>private final&nbsp;java.lang.Class&lt;? extends <a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt; relClass</pre>
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<h4>Impl</h4>
<pre>public&nbsp;Impl&#8203;(java.lang.String&nbsp;name,
java.lang.Class&lt;? extends <a href="../rel/RelNode.html" title="interface in org.apache.calcite.rel">RelNode</a>&gt;&nbsp;relClass)</pre>
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<h4>toString</h4>
<pre class="methodSignature">public&nbsp;java.lang.String&nbsp;toString()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelTrait.html#toString()">RelTrait</a></code></span></div>
<div class="block">Returns a succinct name for this trait. The planner may use this String
to describe the trait.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelTrait.html#toString()">toString</a></code>&nbsp;in interface&nbsp;<code><a href="RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>toString</code>&nbsp;in class&nbsp;<code>java.lang.Object</code></dd>
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<h4>register</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;register&#8203;(<a href="RelOptPlanner.html" title="interface in org.apache.calcite.plan">RelOptPlanner</a>&nbsp;planner)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelTrait.html#register(org.apache.calcite.plan.RelOptPlanner)">RelTrait</a></code></span></div>
<div class="block">Registers a trait instance with the planner.
<p>This is an opportunity to add rules that relate to that trait. However,
typical implementations will do nothing.</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelTrait.html#register(org.apache.calcite.plan.RelOptPlanner)">register</a></code>&nbsp;in interface&nbsp;<code><a href="RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>planner</code> - Planner</dd>
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<h4>satisfies</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;satisfies&#8203;(<a href="RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a>&nbsp;trait)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelTrait.html#satisfies(org.apache.calcite.plan.RelTrait)">RelTrait</a></code></span></div>
<div class="block">Returns whether this trait satisfies a given trait.
<p>A trait satisfies another if it is the same or stricter. For example,
<code>ORDER BY x, y</code> satisfies <code>ORDER BY x</code>.
<p>A trait's <code>satisfies</code> relation must be a partial order (reflexive,
anti-symmetric, transitive). Many traits cannot be "loosened"; their
<code>satisfies</code> is an equivalence relation, where only X satisfies X.
<p>If a trait has multiple values
(see <a href="RelCompositeTrait.html" title="class in org.apache.calcite.plan"><code>RelCompositeTrait</code></a>)
a collection (T0, T1, ...) satisfies T if any Ti satisfies T.</div>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelTrait.html#satisfies(org.apache.calcite.plan.RelTrait)">satisfies</a></code>&nbsp;in interface&nbsp;<code><a href="RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>trait</code> - Given trait</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Whether this trait subsumes a given trait</dd>
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<h4>getInterface</h4>
<pre class="methodSignature">public&nbsp;java.lang.Class&nbsp;getInterface()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="Convention.html#getInterface()">getInterface</a></code>&nbsp;in interface&nbsp;<code><a href="Convention.html" title="interface in org.apache.calcite.plan">Convention</a></code></dd>
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<h4>getName</h4>
<pre class="methodSignature">public&nbsp;java.lang.String&nbsp;getName()</pre>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="Convention.html#getName()">getName</a></code>&nbsp;in interface&nbsp;<code><a href="Convention.html" title="interface in org.apache.calcite.plan">Convention</a></code></dd>
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<h4>getTraitDef</h4>
<pre class="methodSignature">public&nbsp;<a href="RelTraitDef.html" title="class in org.apache.calcite.plan">RelTraitDef</a>&nbsp;getTraitDef()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelTrait.html#getTraitDef()">RelTrait</a></code></span></div>
<div class="block">Returns the RelTraitDef that defines this RelTrait.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelTrait.html#getTraitDef()">getTraitDef</a></code>&nbsp;in interface&nbsp;<code><a href="RelTrait.html" title="interface in org.apache.calcite.plan">RelTrait</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the RelTraitDef that defines this RelTrait</dd>
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<a id="canConvertConvention(org.apache.calcite.plan.Convention)">
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<h4>canConvertConvention</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;canConvertConvention&#8203;(<a href="Convention.html" title="interface in org.apache.calcite.plan">Convention</a>&nbsp;toConvention)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="Convention.html#canConvertConvention(org.apache.calcite.plan.Convention)">Convention</a></code></span></div>
<div class="block">Returns whether we should convert from this convention to
<code>toConvention</code>. Used by <a href="ConventionTraitDef.html" title="class in org.apache.calcite.plan"><code>ConventionTraitDef</code></a>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="Convention.html#canConvertConvention(org.apache.calcite.plan.Convention)">canConvertConvention</a></code>&nbsp;in interface&nbsp;<code><a href="Convention.html" title="interface in org.apache.calcite.plan">Convention</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>toConvention</code> - Desired convention to convert to</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Whether we should convert from this convention to toConvention</dd>
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<h4>useAbstractConvertersForConversion</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;useAbstractConvertersForConversion&#8203;(<a href="RelTraitSet.html" title="class in org.apache.calcite.plan">RelTraitSet</a>&nbsp;fromTraits,
<a href="RelTraitSet.html" title="class in org.apache.calcite.plan">RelTraitSet</a>&nbsp;toTraits)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="Convention.html#useAbstractConvertersForConversion(org.apache.calcite.plan.RelTraitSet,org.apache.calcite.plan.RelTraitSet)">Convention</a></code></span></div>
<div class="block">Returns whether we should convert from this trait set to the other trait
set.
<p>The convention decides whether it wants to handle other trait
conversions, e.g. collation, distribution, etc. For a given convention, we
will only add abstract converters to handle the trait (convention,
collation, distribution, etc.) conversions if this function returns true.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="Convention.html#useAbstractConvertersForConversion(org.apache.calcite.plan.RelTraitSet,org.apache.calcite.plan.RelTraitSet)">useAbstractConvertersForConversion</a></code>&nbsp;in interface&nbsp;<code><a href="Convention.html" title="interface in org.apache.calcite.plan">Convention</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fromTraits</code> - Traits of the RelNode that we are converting from</dd>
<dd><code>toTraits</code> - Target traits</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Whether we should add converters</dd>
</dl>
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