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| <h2 title="Class EvaluationVisitor.VectorVariableHolder" class="title">Class EvaluationVisitor.VectorVariableHolder</h2> |
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| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html" title="class in org.apache.drill.exec.expr">org.apache.drill.exec.expr.ClassGenerator.HoldingContainer</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.drill.exec.expr.EvaluationVisitor.VectorVariableHolder</li> |
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| <pre>public static class <span class="typeNameLabel">EvaluationVisitor.VectorVariableHolder</span> |
| extends <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html" title="class in org.apache.drill.exec.expr">ClassGenerator.HoldingContainer</a></pre> |
| <div class="block">Extended variable descriptor ("holding container") for the variable |
| which references the value holder ("FooHolder") that stores the value |
| from a value vector. Used to pass along the original value vector |
| variable along with the value holder. In particular, this class allows |
| "time travel": to retroactively generate a reader for a union once |
| we realize we need the reader. |
| <p> |
| TODO: This is not especially elegant. But the code that declares the |
| holder/reader does not know about the parameter(s) that will use it, |
| and the normal <code>HoldingContainer</code> can hold only one variable, |
| not a broader context. This version holds more context. Perhaps this |
| idea should be generalized.</div> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/EvaluationVisitor.VectorVariableHolder.html#VectorVariableHolder-org.apache.drill.exec.expr.ClassGenerator.HoldingContainer-org.apache.drill.exec.expr.ClassGenerator-com.sun.codemodel.JBlock-com.sun.codemodel.JExpression-com.sun.codemodel.JExpression-">VectorVariableHolder</a></span>(<a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html" title="class in org.apache.drill.exec.expr">ClassGenerator.HoldingContainer</a> base, |
| <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.html" title="class in org.apache.drill.exec.expr">ClassGenerator</a><?> classGen, |
| com.sun.codemodel.JBlock vvSetupBlock, |
| com.sun.codemodel.JExpression vectorExpr, |
| com.sun.codemodel.JExpression recordIndex)</code> </td> |
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| <td class="colFirst"><code>com.sun.codemodel.JVar</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/EvaluationVisitor.VectorVariableHolder.html#generateUnionReader--">generateUnionReader</a></span>()</code> |
| <div class="block">Specialized hack for the UNION type to obtain a <code>FieldReader</code> |
| directly from the value vector, bypassing the <code>UnionHolder</code> |
| created from that vector.</div> |
| </td> |
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| <code><a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html#f-java.lang.String-">f</a>, <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html#getHolder--">getHolder</a>, <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html#getIsSet--">getIsSet</a>, <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html#getMajorType--">getMajorType</a>, <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html#getMinorType--">getMinorType</a>, <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html#getValue--">getValue</a>, <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html#isConstant--">isConstant</a>, <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html#isOptional--">isOptional</a>, <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html#isReader--">isReader</a>, <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html#isRepeated--">isRepeated</a>, <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html#isSingularRepeated--">isSingularRepeated</a>, <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html#setConstant-boolean-">setConstant</a>, <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html#toString--">toString</a></code></li> |
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| <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#equals-java.lang.Object-" title="class or interface in java.lang">equals</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#hashCode--" title="class or interface in java.lang">hashCode</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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| <h3>Constructor Detail</h3> |
| <a name="VectorVariableHolder-org.apache.drill.exec.expr.ClassGenerator.HoldingContainer-org.apache.drill.exec.expr.ClassGenerator-com.sun.codemodel.JBlock-com.sun.codemodel.JExpression-com.sun.codemodel.JExpression-"> |
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| <h4>VectorVariableHolder</h4> |
| <pre>public VectorVariableHolder(<a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html" title="class in org.apache.drill.exec.expr">ClassGenerator.HoldingContainer</a> base, |
| <a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.html" title="class in org.apache.drill.exec.expr">ClassGenerator</a><?> classGen, |
| com.sun.codemodel.JBlock vvSetupBlock, |
| com.sun.codemodel.JExpression vectorExpr, |
| com.sun.codemodel.JExpression recordIndex)</pre> |
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| <h4>generateUnionReader</h4> |
| <pre>public com.sun.codemodel.JVar generateUnionReader()</pre> |
| <div class="block">Specialized hack for the UNION type to obtain a <code>FieldReader</code> |
| directly from the value vector, bypassing the <code>UnionHolder</code> |
| created from that vector. Handles setting the reader position only once |
| in an eval block rather than on each reference. There may be multiple |
| functions that need the reader. To ensure we create only one common |
| reader, we "go back in time" to add the reader at the point after |
| we declared the <code>UnionHolder</code>.</div> |
| </li> |
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