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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rex</a></div> |
| <h1 title="Class RexFieldAccess" class="title">Class RexFieldAccess</h1> |
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| <div class="inheritance"><a href="RexNode.html" title="class in org.apache.calcite.rex">org.apache.calcite.rex.RexNode</a> |
| <div class="inheritance">org.apache.calcite.rex.RexFieldAccess</div> |
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| <section class="description"> |
| <hr> |
| <pre>public class <span class="typeNameLabel">RexFieldAccess</span> |
| extends <a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></pre> |
| <div class="block">Access to a field of a row-expression. |
| |
| <p>You might expect to use a <code>RexFieldAccess</code> to access columns of |
| relational tables, for example, the expression <code>emp.empno</code> in the |
| query |
| |
| <blockquote> |
| <pre>SELECT emp.empno FROM emp</pre> |
| </blockquote> |
| |
| <p>but there is a specialized expression <a href="RexInputRef.html" title="class in org.apache.calcite.rex"><code>RexInputRef</code></a> for this |
| purpose. So in practice, <code>RexFieldAccess</code> is usually used to |
| access fields of correlating variables, for example the expression |
| <code>emp.deptno</code> in |
| |
| <blockquote> |
| <pre>SELECT ename |
| FROM dept |
| WHERE EXISTS ( |
| SELECT NULL |
| FROM emp |
| WHERE emp.deptno = dept.deptno |
| AND gender = 'F')</pre> |
| </blockquote></div> |
| </section> |
| <section class="summary"> |
| <ul class="blockList"> |
| <!-- =========== FIELD SUMMARY =========== --> |
| <li class="blockList"> |
| <section class="fieldSummary"><a id="field.summary"> |
| <!-- --> |
| </a> |
| <h2>Field Summary</h2> |
| <div class="inheritedList"> |
| <h3>Fields inherited from class org.apache.calcite.rex.<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></h3> |
| <a id="fields.inherited.from.class.org.apache.calcite.rex.RexNode"> |
| <!-- --> |
| </a><code><a href="RexNode.html#digest">digest</a></code></div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <section class="methodSummary"><a id="method.summary"> |
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| </a> |
| <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="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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| <table aria-labelledby="t0"> |
| <thead> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor" id="i0"> |
| <td class="colFirst"><code><R,​ |
| P> R</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#accept(org.apache.calcite.rex.RexBiVisitor,P)">accept</a></span>​(<a href="RexBiVisitor.html" title="interface in org.apache.calcite.rex">RexBiVisitor</a><R,​P> visitor, |
| P arg)</code></th> |
| <td class="colLast"> |
| <div class="block">Accepts a visitor with a payload, dispatching to the right overloaded |
| <a href="RexBiVisitor.html#visitInputRef(org.apache.calcite.rex.RexInputRef,P)"><code>RexBiVisitor.visitInputRef(RexInputRef, Object)</code></a> visitXxx} method.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i1"> |
| <td class="colFirst"><code><R> R</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#accept(org.apache.calcite.rex.RexVisitor)">accept</a></span>​(<a href="RexVisitor.html" title="interface in org.apache.calcite.rex">RexVisitor</a><R> visitor)</code></th> |
| <td class="colLast"> |
| <div class="block">Accepts a visitor, dispatching to the right overloaded |
| <a href="RexVisitor.html#visitInputRef(org.apache.calcite.rex.RexInputRef)"><code>visitXxx</code></a> method.</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>​(@Nullable <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> |
| </tr> |
| <tr class="rowColor" id="i3"> |
| <td class="colFirst"><code><a href="../rel/type/RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getField()">getField</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor" id="i4"> |
| <td class="colFirst"><code><a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getKind()">getKind</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the kind of node this is.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i5"> |
| <td class="colFirst"><code><a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getReferenceExpr()">getReferenceExpr</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the expression whose field is being accessed.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i6"> |
| <td class="colFirst"><code><a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getType()">getType</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor" id="i7"> |
| <td class="colFirst"><code>int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#hashCode()">hashCode</a></span>()</code></th> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="inheritedList"> |
| <h3>Methods inherited from class org.apache.calcite.rex.<a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></h3> |
| <a id="methods.inherited.from.class.org.apache.calcite.rex.RexNode"> |
| <!-- --> |
| </a><code><a href="RexNode.html#isA(java.util.Collection)">isA</a>, <a href="RexNode.html#isA(org.apache.calcite.sql.SqlKind)">isA</a>, <a href="RexNode.html#isAlwaysFalse()">isAlwaysFalse</a>, <a href="RexNode.html#isAlwaysTrue()">isAlwaysTrue</a>, <a href="RexNode.html#nodeCount()">nodeCount</a>, <a href="RexNode.html#toString()">toString</a></code></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> |
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| <h3><a id="getField()">getField</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType"><a href="../rel/type/RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a></span> <span class="memberName">getField</span>()</div> |
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| <h3><a id="getType()">getType</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType"><a href="../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></span> <span class="memberName">getType</span>()</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="RexNode.html#getType()">getType</a></code> in class <code><a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></dd> |
| </dl> |
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| <section class="detail"> |
| <h3><a id="getKind()">getKind</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType"><a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a></span> <span class="memberName">getKind</span>()</div> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="RexNode.html#getKind()">RexNode</a></code></span></div> |
| <div class="block">Returns the kind of node this is.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="RexNode.html#getKind()">getKind</a></code> in class <code><a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Node kind, never null</dd> |
| </dl> |
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| </li> |
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| <section class="detail"> |
| <h3><a id="accept(org.apache.calcite.rex.RexVisitor)">accept</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="typeParameters"><R></span> <span class="returnType">R</span> <span class="memberName">accept</span>​(<span class="arguments"><a href="RexVisitor.html" title="interface in org.apache.calcite.rex">RexVisitor</a><R> visitor)</span></div> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="RexNode.html#accept(org.apache.calcite.rex.RexVisitor)">RexNode</a></code></span></div> |
| <div class="block">Accepts a visitor, dispatching to the right overloaded |
| <a href="RexVisitor.html#visitInputRef(org.apache.calcite.rex.RexInputRef)"><code>visitXxx</code></a> method. |
| |
| <p>Also see <a href="RexUtil.html#apply(org.apache.calcite.rex.RexVisitor,java.util.List,org.apache.calcite.rex.RexNode)"><code>RexUtil.apply(RexVisitor, java.util.List, RexNode)</code></a>, |
| which applies a visitor to several expressions simultaneously.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="RexNode.html#accept(org.apache.calcite.rex.RexVisitor)">accept</a></code> in class <code><a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></dd> |
| </dl> |
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| <li class="blockList"> |
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| <h3><a id="accept(org.apache.calcite.rex.RexBiVisitor,java.lang.Object)"> |
| <!-- --> |
| </a><a id="accept(org.apache.calcite.rex.RexBiVisitor,P)">accept</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="typeParameters"><R,​ |
| P></span> <span class="returnType">R</span> <span class="memberName">accept</span>​(<span class="arguments"><a href="RexBiVisitor.html" title="interface in org.apache.calcite.rex">RexBiVisitor</a><R,​P> visitor, |
| P arg)</span></div> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="RexNode.html#accept(org.apache.calcite.rex.RexBiVisitor,P)">RexNode</a></code></span></div> |
| <div class="block">Accepts a visitor with a payload, dispatching to the right overloaded |
| <a href="RexBiVisitor.html#visitInputRef(org.apache.calcite.rex.RexInputRef,P)"><code>RexBiVisitor.visitInputRef(RexInputRef, Object)</code></a> visitXxx} method.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="RexNode.html#accept(org.apache.calcite.rex.RexBiVisitor,P)">accept</a></code> in class <code><a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></dd> |
| </dl> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="getReferenceExpr()">getReferenceExpr</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType"><a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></span> <span class="memberName">getReferenceExpr</span>()</div> |
| <div class="block">Returns the expression whose field is being accessed.</div> |
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| <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">@Nullable <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> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="RexNode.html#equals(java.lang.Object)">RexNode</a></code></span></div> |
| <div class="block"> |
| |
| <p>Every node must implement <a href="RexNode.html#equals(java.lang.Object)"><code>RexNode.equals(java.lang.Object)</code></a> based on its content</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="RexNode.html#equals(java.lang.Object)">equals</a></code> in class <code><a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></dd> |
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| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType">int</span> <span class="memberName">hashCode</span>()</div> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="RexNode.html#hashCode()">RexNode</a></code></span></div> |
| <div class="block"> |
| |
| <p>Every node must implement <a href="RexNode.html#hashCode()"><code>RexNode.hashCode()</code></a> consistent with |
| <a href="RexNode.html#equals(java.lang.Object)"><code>RexNode.equals(java.lang.Object)</code></a></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="RexNode.html#hashCode()">hashCode</a></code> in class <code><a href="RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></dd> |
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| </footer> |
| </div> |
| </div> |
| </body> |
| </html> |