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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rel.hint</a></div> |
| <h1 title="Class RelHint" class="title">Class RelHint</h1> |
| </div> |
| <div class="contentContainer"> |
| <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.hint.RelHint</div> |
| </div> |
| <section class="description"> |
| <hr> |
| <pre>public class <span class="typeNameLabel">RelHint</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">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 → {Hint1[]}</li> |
| <li>Join → {Hint1[0]}</li> |
| <li>Scan → {Hint1[0, 0]}</li> |
| <li>Project → {Hint1[0,1], Hint2[]}</li> |
| <li>Scan2 → {[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> |
| </section> |
| <section class="summary"> |
| <ul class="blockList"> |
| <!-- ======== NESTED CLASS SUMMARY ======== --> |
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| <section class="nestedClassSummary"><a id="nested.class.summary"> |
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| <table> |
| <caption><span>Nested Classes</span><span class="tabEnd"> </span></caption> |
| <thead> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RelHint.Builder.html" title="class in org.apache.calcite.rel.hint">RelHint.Builder</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Builder for <a href="RelHint.html" title="class in org.apache.calcite.rel.hint"><code>RelHint</code></a>.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </section> |
| </li> |
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| <h2>Field Summary</h2> |
| <div class="memberSummary"> |
| <table> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <thead> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Field</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#hintName">hintName</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>com.google.common.collect.ImmutableList<<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#inheritPath">inheritPath</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/9/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util" class="externalLink">Map</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>,​<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#kvOptions">kvOptions</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><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><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#listOptions">listOptions</a></span></code></th> |
| <td class="colLast"> </td> |
| </tr> |
| </tbody> |
| </table> |
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| <h2>Method Summary</h2> |
| <div class="memberSummary"> |
| <div role="tablist" aria-orientation="horizontal"><button role="tab" aria-selected="true" aria-controls="memberSummary_tabpanel" tabindex="0" onkeydown="switchTab(event)" id="t0" class="activeTableTab">All Methods</button><button role="tab" aria-selected="false" aria-controls="memberSummary_tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t1" class="tableTab" onclick="show(1);">Static Methods</button><button role="tab" aria-selected="false" aria-controls="memberSummary_tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t2" class="tableTab" onclick="show(2);">Instance Methods</button><button role="tab" aria-selected="false" aria-controls="memberSummary_tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t4" class="tableTab" onclick="show(8);">Concrete Methods</button></div> |
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| <thead> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <th class="colLast" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor" id="i0"> |
| <td class="colFirst"><code>static <a href="RelHint.Builder.html" title="class in org.apache.calcite.rel.hint">RelHint.Builder</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#builder(java.lang.String)">builder</a></span>​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> hintName)</code></th> |
| <td class="colLast"> |
| <div class="block">Creates a hint builder with specified hint name.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i1"> |
| <td class="colFirst"><code><a href="RelHint.html" title="class in org.apache.calcite.rel.hint">RelHint</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#copy(java.util.List)">copy</a></span>​(<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><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>> inheritPath)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns a copy of this hint with specified inherit path.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i2"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#equals(java.lang.Object)">equals</a></span>​(<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> o)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor" id="i3"> |
| <td class="colFirst"><code>int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#hashCode()">hashCode</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor" id="i4"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString()">toString</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="inheritedList"> |
| <h3>Methods inherited from class 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"> |
| <!-- --> |
| </a><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
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| <h3><a id="inheritPath">inheritPath</a></h3> |
| <div class="memberSignature"><span class="modifiers">public final</span> <span class="returnType">com.google.common.collect.ImmutableList<<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>></span> <span class="memberName">inheritPath</span></div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="hintName">hintName</a></h3> |
| <div class="memberSignature"><span class="modifiers">public final</span> <span class="returnType"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></span> <span class="memberName">hintName</span></div> |
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| <section class="detail"> |
| <h3><a id="listOptions">listOptions</a></h3> |
| <div class="memberSignature"><span class="modifiers">public final</span> <span class="returnType"><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><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>></span> <span class="memberName">listOptions</span></div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="kvOptions">kvOptions</a></h3> |
| <div class="memberSignature"><span class="modifiers">public final</span> <span class="returnType"><a href="https://docs.oracle.com/javase/9/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util" class="externalLink">Map</a><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>,​<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>></span> <span class="memberName">kvOptions</span></div> |
| </section> |
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| <!-- ============ METHOD DETAIL ========== --> |
| <li class="blockList"> |
| <section class="methodDetails"><a id="method.detail"> |
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| </a> |
| <h2>Method Details</h2> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="builder(java.lang.String)">builder</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static</span> <span class="returnType"><a href="RelHint.Builder.html" title="class in org.apache.calcite.rel.hint">RelHint.Builder</a></span> <span class="memberName">builder</span>​(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> hintName)</span></div> |
| <div class="block">Creates a hint builder with specified hint name.</div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="copy(java.util.List)">copy</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType"><a href="RelHint.html" title="class in org.apache.calcite.rel.hint">RelHint</a></span> <span class="memberName">copy</span>​(<span class="arguments"><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><<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>> inheritPath)</span></div> |
| <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> |
| </dl> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="equals(java.lang.Object)">equals</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType">boolean</span> <span class="memberName">equals</span>​(<span class="arguments"><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> o)</span></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</a></code> in class <code><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></code></dd> |
| </dl> |
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| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="hashCode()">hashCode</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType">int</span> <span class="memberName">hashCode</span>()</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</a></code> in class <code><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></code></dd> |
| </dl> |
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| <section class="detail"> |
| <h3><a id="toString()">toString</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></span> <span class="memberName">toString</span>()</div> |
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