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<div class="subTitle">org.apache.calcite.rel.hint</div>
<h2 title="Class RelHint" class="title">Class RelHint</h2>
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<li>org.apache.calcite.rel.hint.RelHint</li>
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<pre>public class <span class="typeNameLabel">RelHint</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">Hint attached to a relation expression.
<p>A hint can be used to:
<ul>
<li>Enforce planner: there's no perfect planner, so it makes sense to implement hints to
allow user better control the execution. For instance, "never merge this subquery with others",
"treat those tables as leading ones" in the join ordering, etc.</li>
<li>Append meta data/statistics: Some statistics like “table index for scan” and
“skew info of some shuffle keys” are somewhat dynamic for the query, it would be very
convenient to config them with hints because our planning metadata from the planner is very
often not that accurate.</li>
<li>Operator resource constraints: For many cases, we would give a default resource
configuration for the execution operators, i.e. min parallelism or
managed memory (resource consuming UDF) or special resource requirement (GPU or SSD disk)
and so on, it would be very flexible to profile the resource with hints per query
(instead of the Job).</li>
</ul>
<p>In order to support hint override, each hint has a <code>inheritPath</code> (integers list) to
record its propagate path from the root node, number `0` represents the hint was propagated
along the first(left) child, number `1` represents the hint was propagated along the
second(right) child. Given a relational expression tree with initial attached hints:
<blockquote><pre>
Filter (Hint1)
|
Join
/ \
Scan Project (Hint2)
|
Scan2
</pre></blockquote>
<p>The plan would have hints path as follows (assumes each hint can be propagated to all
child nodes):
<blockquote><ul>
<li>Filter &#8594; {Hint1[]}</li>
<li>Join &#8594; {Hint1[0]}</li>
<li>Scan &#8594; {Hint1[0, 0]}</li>
<li>Project &#8594; {Hint1[0,1], Hint2[]}</li>
<li>Scan2 &#8594; {[Hint1[0, 1, 0], Hint2[0]}</li>
</ul></blockquote>
<p><code>listOptions</code> and <code>kvOptions</code> are supposed to contain the same information,
they are mutually exclusive, that means, they can not both be non-empty.
<p>RelHint is immutable.</div>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/hint/RelHint.Builder.html" title="class in org.apache.calcite.rel.hint">RelHint.Builder</a></span></code>
<div class="block">Builder for <a href="../../../../../org/apache/calcite/rel/hint/RelHint.html" title="class in org.apache.calcite.rel.hint"><code>RelHint</code></a>.</div>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/hint/RelHint.html#hintName">hintName</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>com.google.common.collect.ImmutableList&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/hint/RelHint.html#inheritPath">inheritPath</a></span></code>&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/hint/RelHint.html#kvOptions">kvOptions</a></span></code>&nbsp;</td>
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<td class="colFirst"><code><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>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/hint/RelHint.html#listOptions">listOptions</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/rel/hint/RelHint.Builder.html" title="class in org.apache.calcite.rel.hint">RelHint.Builder</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/hint/RelHint.html#builder-java.lang.String-">builder</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;hintName)</code>
<div class="block">Creates a hint builder with specified hint name.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/rel/hint/RelHint.html" title="class in org.apache.calcite.rel.hint">RelHint</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/hint/RelHint.html#copy-java.util.List-">copy</a></span>(<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>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&gt;&nbsp;inheritPath)</code>
<div class="block">Returns a copy of this hint with specified inherit path.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/hint/RelHint.html#equals-java.lang.Object-">equals</a></span>(<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>&nbsp;o)</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/hint/RelHint.html#hashCode--">hashCode</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/hint/RelHint.html#toString--">toString</a></span>()</code>&nbsp;</td>
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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#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#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#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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<pre>public final&nbsp;com.google.common.collect.ImmutableList&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&gt; inheritPath</pre>
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<pre>public final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> hintName</pre>
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<h4>listOptions</h4>
<pre>public final&nbsp;<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>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt; listOptions</pre>
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<h4>kvOptions</h4>
<pre>public final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt; kvOptions</pre>
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<pre>public static&nbsp;<a href="../../../../../org/apache/calcite/rel/hint/RelHint.Builder.html" title="class in org.apache.calcite.rel.hint">RelHint.Builder</a>&nbsp;builder(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;hintName)</pre>
<div class="block">Creates a hint builder with specified hint name.</div>
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<h4>copy</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/hint/RelHint.html" title="class in org.apache.calcite.rel.hint">RelHint</a>&nbsp;copy(<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>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&gt;&nbsp;inheritPath)</pre>
<div class="block">Returns a copy of this hint with specified inherit path.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>inheritPath</code> - Hint path</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the new <code>RelHint</code></dd>
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<pre>public&nbsp;boolean&nbsp;equals(<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>&nbsp;o)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><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></code>&nbsp;in class&nbsp;<code><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></code></dd>
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<pre>public&nbsp;int&nbsp;hashCode()</pre>
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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="class or interface in java.lang">String</a>&nbsp;toString()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
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