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<div class="subTitle">org.apache.hadoop.hive.ql.exec.vector</div>
<h2 title="Class ColumnVector" class="title">Class ColumnVector</h2>
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<li>org.apache.hadoop.hive.ql.exec.vector.ColumnVector</li>
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<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/BytesColumnVector.html" title="class in org.apache.hadoop.hive.ql.exec.vector">BytesColumnVector</a>, <a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/DecimalColumnVector.html" title="class in org.apache.hadoop.hive.ql.exec.vector">DecimalColumnVector</a>, <a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/DoubleColumnVector.html" title="class in org.apache.hadoop.hive.ql.exec.vector">DoubleColumnVector</a>, <a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/IntervalDayTimeColumnVector.html" title="class in org.apache.hadoop.hive.ql.exec.vector">IntervalDayTimeColumnVector</a>, <a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/LongColumnVector.html" title="class in org.apache.hadoop.hive.ql.exec.vector">LongColumnVector</a>, <a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/MultiValuedColumnVector.html" title="class in org.apache.hadoop.hive.ql.exec.vector">MultiValuedColumnVector</a>, <a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/StructColumnVector.html" title="class in org.apache.hadoop.hive.ql.exec.vector">StructColumnVector</a>, <a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/TimestampColumnVector.html" title="class in org.apache.hadoop.hive.ql.exec.vector">TimestampColumnVector</a>, <a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/UnionColumnVector.html" title="class in org.apache.hadoop.hive.ql.exec.vector">UnionColumnVector</a></dd>
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<pre>public abstract class <span class="typeNameLabel">ColumnVector</span>
extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">ColumnVector contains the shared structure for the sub-types,
 including NULL information, and whether this vector
 repeats, i.e. has all values the same, so only the first
 one is set. This is used to accelerate query performance
 by handling a whole vector in O(1) time when applicable.

 The fields are public by design since this is a performance-critical
 structure that is used in the inner loop of query execution.</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/hadoop/hive/ql/exec/vector/ColumnVector.Type.html" title="enum in org.apache.hadoop.hive.ql.exec.vector">ColumnVector.Type</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>boolean[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#isNull">isNull</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#isRepeating">isRepeating</a></span></code>&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#noNulls">noNulls</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#ColumnVector-int-">ColumnVector</a></span>(int&nbsp;len)</code>
<div class="block">Constructor for super-class ColumnVector.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#ensureSize-int-boolean-">ensureSize</a></span>(int&nbsp;size,
          boolean&nbsp;presesrveData)</code>
<div class="block">Ensure the ColumnVector can hold at least size values.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#flatten-boolean-int:A-int-">flatten</a></span>(boolean&nbsp;selectedInUse,
       int[]&nbsp;sel,
       int&nbsp;size)</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#flattenNoNulls-boolean-int:A-int-">flattenNoNulls</a></span>(boolean&nbsp;selectedInUse,
              int[]&nbsp;sel,
              int&nbsp;size)</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#flattenPush--">flattenPush</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#flattenRepeatingNulls-boolean-int:A-int-">flattenRepeatingNulls</a></span>(boolean&nbsp;selectedInUse,
                     int[]&nbsp;sel,
                     int&nbsp;size)</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#init--">init</a></span>()</code>
<div class="block">Initialize the column vector.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#reset--">reset</a></span>()</code>
<div class="block">Resets the column to default state
  - fills the isNull array with false
  - sets noNulls to true
  - sets isRepeating to false</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#setElement-int-int-org.apache.hadoop.hive.ql.exec.vector.ColumnVector-">setElement</a></span>(int&nbsp;outElementNum,
          int&nbsp;inputElementNum,
          <a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html" title="class in org.apache.hadoop.hive.ql.exec.vector">ColumnVector</a>&nbsp;inputVector)</code>
<div class="block">Set the element in this column vector from the given input vector.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#setRepeating-boolean-">setRepeating</a></span>(boolean&nbsp;isRepeating)</code>
<div class="block">Sets the isRepeating flag.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#stringifyValue-java.lang.StringBuilder-int-">stringifyValue</a></span>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/StringBuilder.html?is-external=true" title="class or interface in java.lang">StringBuilder</a>&nbsp;buffer,
              int&nbsp;row)</code>
<div class="block">Print the value for this column into the given string builder.</div>
</td>
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<tr id="i10" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html#unFlatten--">unFlatten</a></span>()</code>
<div class="block">Restore the state of isRepeating and noNulls to what it was
 before flattening.</div>
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<h4>isNull</h4>
<pre>public&nbsp;boolean[] isNull</pre>
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<pre>public&nbsp;boolean noNulls</pre>
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<a name="isRepeating">
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<h4>isRepeating</h4>
<pre>public&nbsp;boolean isRepeating</pre>
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<h4>ColumnVector</h4>
<pre>public&nbsp;ColumnVector(int&nbsp;len)</pre>
<div class="block">Constructor for super-class ColumnVector. This is not called directly,
 but used to initialize inherited fields.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>len</code> - Vector length</dd>
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<h4>reset</h4>
<pre>public&nbsp;void&nbsp;reset()</pre>
<div class="block">Resets the column to default state
  - fills the isNull array with false
  - sets noNulls to true
  - sets isRepeating to false</div>
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<a name="setRepeating-boolean-">
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<h4>setRepeating</h4>
<pre>public&nbsp;void&nbsp;setRepeating(boolean&nbsp;isRepeating)</pre>
<div class="block">Sets the isRepeating flag. Recurses over structs and unions so that the
 flags are set correctly.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>isRepeating</code> - </dd>
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<h4>flatten</h4>
<pre>public abstract&nbsp;void&nbsp;flatten(boolean&nbsp;selectedInUse,
                             int[]&nbsp;sel,
                             int&nbsp;size)</pre>
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<h4>flattenRepeatingNulls</h4>
<pre>protected&nbsp;void&nbsp;flattenRepeatingNulls(boolean&nbsp;selectedInUse,
                                     int[]&nbsp;sel,
                                     int&nbsp;size)</pre>
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<h4>flattenNoNulls</h4>
<pre>protected&nbsp;void&nbsp;flattenNoNulls(boolean&nbsp;selectedInUse,
                              int[]&nbsp;sel,
                              int&nbsp;size)</pre>
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<pre>public&nbsp;void&nbsp;unFlatten()</pre>
<div class="block">Restore the state of isRepeating and noNulls to what it was
 before flattening. This must only be called just after flattening
 and then evaluating a VectorExpression on the column vector.
 It is an optimization that allows other operations on the same
 column to continue to benefit from the isRepeating and noNulls
 indicators.</div>
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<h4>flattenPush</h4>
<pre>protected&nbsp;void&nbsp;flattenPush()</pre>
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<h4>setElement</h4>
<pre>public abstract&nbsp;void&nbsp;setElement(int&nbsp;outElementNum,
                                int&nbsp;inputElementNum,
                                <a href="../../../../../../../org/apache/hadoop/hive/ql/exec/vector/ColumnVector.html" title="class in org.apache.hadoop.hive.ql.exec.vector">ColumnVector</a>&nbsp;inputVector)</pre>
<div class="block">Set the element in this column vector from the given input vector.
 This method can assume that the output does not have isRepeating set.</div>
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<h4>init</h4>
<pre>public&nbsp;void&nbsp;init()</pre>
<div class="block">Initialize the column vector. This method can be overridden by specific column vector types.
 Use this method only if the individual type of the column vector is not known, otherwise its
 preferable to call specific initialization methods.</div>
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<h4>ensureSize</h4>
<pre>public&nbsp;void&nbsp;ensureSize(int&nbsp;size,
                       boolean&nbsp;presesrveData)</pre>
<div class="block">Ensure the ColumnVector can hold at least size values.
 This method is deliberately *not* recursive because the complex types
 can easily have more (or less) children than the upper levels.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>size</code> - the new minimum size</dd>
<dd><code>presesrveData</code> - should the old data be preserved?</dd>
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<h4>stringifyValue</h4>
<pre>public abstract&nbsp;void&nbsp;stringifyValue(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/StringBuilder.html?is-external=true" title="class or interface in java.lang">StringBuilder</a>&nbsp;buffer,
                                    int&nbsp;row)</pre>
<div class="block">Print the value for this column into the given string builder.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>buffer</code> - the buffer to print into</dd>
<dd><code>row</code> - the id of the row to print</dd>
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