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<div class="subTitle">org.apache.drill.exec.vector.accessor.reader</div>
<h2 title="Class VectorAccessors" class="title">Class VectorAccessors</h2>
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<pre>public class <span class="typeNameLabel">VectorAccessors</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">Collection of vector accessors. A single class handles the single-batch
case. But, for hyper-vectors, we need a separate accessor for each
(vector, sub-vector) combination to handle the
indirections in the hyper-vector case.
<p>
For a required vector:<br>
reader index --> hyper vector --> required vector
<p>
For a nullable vector:<br>
reader index --> hyper vector --> nullable vector<br>
nullable vector --> bits vector<br>
--> values vector
<p>
For a repeated vector:<br>
reader index --> hyper vector --> repeated vector<br>
repeated vector --> offset vector<br>
--> values vector
<p>
And so on. In each case, we must start with a top-level
vector as indicated the row index, indirected through the
SV4. That is done by the reader index. That points to a
top-level vector in the hyper-vector.
<p>
Most of the vectors needed are nested. These inner vectors
are not part of a hyper-vector list. Instead, we must get the
top-level vector, then navigate down from that vector to the
desired vector.
<p>
Sometimes the navigation is static (the "bits" vector for
a nullable vector.) Other times, it is a bit more dynamic: a
member of a map (given by index) or the member of a union
(given by type.)
<p>
These accessors can be chained to handle deeply-nested
structures such as an array of maps that contains a list of
unions.
<p>
Because the navigation is required on every access, the use of hyper
vectors is slow. Since hyper-vectors are seldom used, we
optimize for the single-batch case by caching vectors at each
stage. Thus, for the single-batch case, we use different accessor
implementations. To keep the rest of the code simple, both the
hyper and single batch cases use the same API, but they use
entirely different implementations. The methods here choose
the correct implementation for the single and hyper cases.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.ArrayDataHyperVectorAccessor.html" title="class in org.apache.drill.exec.vector.accessor.reader">VectorAccessors.ArrayDataHyperVectorAccessor</a></span></code>
<div class="block">Vector accessor for RepeatedVector &rarr; data vector</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.ArrayOffsetHyperVectorAccessor.html" title="class in org.apache.drill.exec.vector.accessor.reader">VectorAccessors.ArrayOffsetHyperVectorAccessor</a></span></code>
<div class="block">Vector accessor for RepeatedVector &rarr; offsets vector</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.BaseHyperVectorAccessor.html" title="class in org.apache.drill.exec.vector.accessor.reader">VectorAccessors.BaseHyperVectorAccessor</a></span></code>
<div class="block">Vector accessor used by the column accessors to obtain the vector for
each column value.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.ListBitsHyperVectorStateReader.html" title="class in org.apache.drill.exec.vector.accessor.reader">VectorAccessors.ListBitsHyperVectorStateReader</a></span></code>
<div class="block">Vector accessor for ListVector &rarr; bits vector</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.ListMemberHyperVectorAccessor.html" title="class in org.apache.drill.exec.vector.accessor.reader">VectorAccessors.ListMemberHyperVectorAccessor</a></span></code>&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.MapMemberHyperVectorAccessor.html" title="class in org.apache.drill.exec.vector.accessor.reader">VectorAccessors.MapMemberHyperVectorAccessor</a></span></code>
<div class="block">Vector accessor for AbstractMapVector &rarr; member vector</div>
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<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.NullableBitsHyperVectorStateReader.html" title="class in org.apache.drill.exec.vector.accessor.reader">VectorAccessors.NullableBitsHyperVectorStateReader</a></span></code>
<div class="block">Vector accessor for NullableVector &rarr; bits vector</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.NullableValuesHyperVectorAccessor.html" title="class in org.apache.drill.exec.vector.accessor.reader">VectorAccessors.NullableValuesHyperVectorAccessor</a></span></code>
<div class="block">Vector accessor for NullableVector &rarr; values vector</div>
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<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.NullVectorAccesor.html" title="class in org.apache.drill.exec.vector.accessor.reader">VectorAccessors.NullVectorAccesor</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.SingleVectorAccessor.html" title="class in org.apache.drill.exec.vector.accessor.reader">VectorAccessors.SingleVectorAccessor</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.UnionMemberHyperVectorAccessor.html" title="class in org.apache.drill.exec.vector.accessor.reader">VectorAccessors.UnionMemberHyperVectorAccessor</a></span></code>
<div class="block">Vector accessor for UnionVector &rarr; data vector</div>
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<tr class="rowColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.UnionTypeHyperVectorAccessor.html" title="class in org.apache.drill.exec.vector.accessor.reader">VectorAccessors.UnionTypeHyperVectorAccessor</a></span></code>
<div class="block">Vector accessor for UnionVector &rarr; type vector</div>
</td>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.VarWidthOffsetHyperVectorAccessor.html" title="class in org.apache.drill.exec.vector.accessor.reader">VectorAccessors.VarWidthOffsetHyperVectorAccessor</a></span></code>
<div class="block">Vector accessor for VariableWidthVector &rarr; offsets vector</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.html#VectorAccessors--">VectorAccessors</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>static <a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.html#arrayDataAccessor-org.apache.drill.exec.vector.accessor.reader.VectorAccessor-">arrayDataAccessor</a></span>(<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;repeatedAccessor)</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.html#arrayOffsetVectorAccessor-org.apache.drill.exec.vector.accessor.reader.VectorAccessor-">arrayOffsetVectorAccessor</a></span>(<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;repeatedAccessor)</code>&nbsp;</td>
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<td class="colFirst"><code>static <a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.html#listBitsAccessor-org.apache.drill.exec.vector.accessor.reader.VectorAccessor-">listBitsAccessor</a></span>(<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;nullableAccessor)</code>&nbsp;</td>
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<td class="colFirst"><code>static <a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.html#nullableBitsAccessor-org.apache.drill.exec.vector.accessor.reader.VectorAccessor-">nullableBitsAccessor</a></span>(<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;nullableAccessor)</code>&nbsp;</td>
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<td class="colFirst"><code>static <a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.html#nullableValuesAccessor-org.apache.drill.exec.vector.accessor.reader.VectorAccessor-">nullableValuesAccessor</a></span>(<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;nullableAccessor)</code>&nbsp;</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessors.html#varWidthOffsetVectorAccessor-org.apache.drill.exec.vector.accessor.reader.VectorAccessor-">varWidthOffsetVectorAccessor</a></span>(<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;varWidthAccessor)</code>&nbsp;</td>
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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#toString--" title="class or interface in java.lang">toString</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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<h4>VectorAccessors</h4>
<pre>public&nbsp;VectorAccessors()</pre>
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<pre>public static&nbsp;<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;arrayOffsetVectorAccessor(<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;repeatedAccessor)</pre>
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<pre>public static&nbsp;<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;arrayDataAccessor(<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;repeatedAccessor)</pre>
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<pre>public static&nbsp;<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;varWidthOffsetVectorAccessor(<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;varWidthAccessor)</pre>
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<pre>public static&nbsp;<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;nullableValuesAccessor(<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;nullableAccessor)</pre>
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<pre>public static&nbsp;<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;nullableBitsAccessor(<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;nullableAccessor)</pre>
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<h4>listBitsAccessor</h4>
<pre>public static&nbsp;<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;listBitsAccessor(<a href="../../../../../../../org/apache/drill/exec/vector/accessor/reader/VectorAccessor.html" title="interface in org.apache.drill.exec.vector.accessor.reader">VectorAccessor</a>&nbsp;nullableAccessor)</pre>
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