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| <div class="subTitle">org.apache.arrow.algorithm.dictionary</div> |
| <h2 title="Class LinearDictionaryEncoder" class="title">Class LinearDictionaryEncoder<E extends <a href="../../../../../org/apache/arrow/vector/BaseIntVector.html" title="interface in org.apache.arrow.vector">BaseIntVector</a>,D extends <a href="../../../../../org/apache/arrow/vector/ValueVector.html" title="interface in org.apache.arrow.vector">ValueVector</a>></h2> |
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| <li>org.apache.arrow.algorithm.dictionary.LinearDictionaryEncoder<E,D></li> |
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| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>E</code> - encoded vector type.</dd> |
| <dd><code>D</code> - decoded vector type, which is also the dictionary type.</dd> |
| </dl> |
| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../org/apache/arrow/algorithm/dictionary/DictionaryEncoder.html" title="interface in org.apache.arrow.algorithm.dictionary">DictionaryEncoder</a><E,D></dd> |
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| <pre>public class <span class="typeNameLabel">LinearDictionaryEncoder<E extends <a href="../../../../../org/apache/arrow/vector/BaseIntVector.html" title="interface in org.apache.arrow.vector">BaseIntVector</a>,D extends <a href="../../../../../org/apache/arrow/vector/ValueVector.html" title="interface in org.apache.arrow.vector">ValueVector</a>></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> |
| implements <a href="../../../../../org/apache/arrow/algorithm/dictionary/DictionaryEncoder.html" title="interface in org.apache.arrow.algorithm.dictionary">DictionaryEncoder</a><E,D></pre> |
| <div class="block">Dictionary encoder based on linear search.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/algorithm/dictionary/LinearDictionaryEncoder.html#LinearDictionaryEncoder-D-">LinearDictionaryEncoder</a></span>(<a href="../../../../../org/apache/arrow/algorithm/dictionary/LinearDictionaryEncoder.html" title="type parameter in LinearDictionaryEncoder">D</a> dictionary)</code> |
| <div class="block">Constructs a dictionary encoder, with the encode null flag set to false.</div> |
| </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/algorithm/dictionary/LinearDictionaryEncoder.html#LinearDictionaryEncoder-D-boolean-">LinearDictionaryEncoder</a></span>(<a href="../../../../../org/apache/arrow/algorithm/dictionary/LinearDictionaryEncoder.html" title="type parameter in LinearDictionaryEncoder">D</a> dictionary, |
| boolean encodeNull)</code> |
| <div class="block">Constructs a dictionary encoder.</div> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/algorithm/dictionary/LinearDictionaryEncoder.html#encode-D-E-">encode</a></span>(<a href="../../../../../org/apache/arrow/algorithm/dictionary/LinearDictionaryEncoder.html" title="type parameter in LinearDictionaryEncoder">D</a> input, |
| <a href="../../../../../org/apache/arrow/algorithm/dictionary/LinearDictionaryEncoder.html" title="type parameter in LinearDictionaryEncoder">E</a> output)</code> |
| <div class="block">Encodes an input vector by linear search.</div> |
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| <a name="LinearDictionaryEncoder-org.apache.arrow.vector.ValueVector-"> |
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| </a><a name="LinearDictionaryEncoder-D-"> |
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| <h4>LinearDictionaryEncoder</h4> |
| <pre>public LinearDictionaryEncoder(<a href="../../../../../org/apache/arrow/algorithm/dictionary/LinearDictionaryEncoder.html" title="type parameter in LinearDictionaryEncoder">D</a> dictionary)</pre> |
| <div class="block">Constructs a dictionary encoder, with the encode null flag set to false.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>dictionary</code> - the dictionary. Its entries should be sorted in the non-increasing order of their frequency. |
| Otherwise, the encoder still produces correct results, but at the expense of performance overhead.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="LinearDictionaryEncoder-org.apache.arrow.vector.ValueVector-boolean-"> |
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| </a><a name="LinearDictionaryEncoder-D-boolean-"> |
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| <h4>LinearDictionaryEncoder</h4> |
| <pre>public LinearDictionaryEncoder(<a href="../../../../../org/apache/arrow/algorithm/dictionary/LinearDictionaryEncoder.html" title="type parameter in LinearDictionaryEncoder">D</a> dictionary, |
| boolean encodeNull)</pre> |
| <div class="block">Constructs a dictionary encoder.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>dictionary</code> - the dictionary. Its entries should be sorted in the non-increasing order of their frequency. |
| Otherwise, the encoder still produces correct results, but at the expense of performance overhead.</dd> |
| <dd><code>encodeNull</code> - a flag indicating if null should be encoded. |
| It determines the behaviors for processing null values in the input during encoding. |
| When a null is encountered in the input, |
| 1) If the flag is set to true, the encoder searches for the value in the dictionary, |
| and outputs the index in the dictionary. |
| 2) If the flag is set to false, the encoder simply produces a null in the output.</dd> |
| </dl> |
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| <a name="encode-org.apache.arrow.vector.ValueVector-org.apache.arrow.vector.BaseIntVector-"> |
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| </a><a name="encode-D-E-"> |
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| <h4>encode</h4> |
| <pre>public void encode(<a href="../../../../../org/apache/arrow/algorithm/dictionary/LinearDictionaryEncoder.html" title="type parameter in LinearDictionaryEncoder">D</a> input, |
| <a href="../../../../../org/apache/arrow/algorithm/dictionary/LinearDictionaryEncoder.html" title="type parameter in LinearDictionaryEncoder">E</a> output)</pre> |
| <div class="block">Encodes an input vector by linear search. |
| When the dictionary is sorted in the non-increasing order of the entry frequency, |
| it will have constant time complexity, with no extra memory requirement.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/arrow/algorithm/dictionary/DictionaryEncoder.html#encode-D-E-">encode</a></code> in interface <code><a href="../../../../../org/apache/arrow/algorithm/dictionary/DictionaryEncoder.html" title="interface in org.apache.arrow.algorithm.dictionary">DictionaryEncoder</a><<a href="../../../../../org/apache/arrow/algorithm/dictionary/LinearDictionaryEncoder.html" title="type parameter in LinearDictionaryEncoder">E</a> extends <a href="../../../../../org/apache/arrow/vector/BaseIntVector.html" title="interface in org.apache.arrow.vector">BaseIntVector</a>,<a href="../../../../../org/apache/arrow/algorithm/dictionary/LinearDictionaryEncoder.html" title="type parameter in LinearDictionaryEncoder">D</a> extends <a href="../../../../../org/apache/arrow/vector/ValueVector.html" title="interface in org.apache.arrow.vector">ValueVector</a>></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>input</code> - the input vector.</dd> |
| <dd><code>output</code> - the output vector. Note that it must be in a fresh state. At least, |
| all its validity bits should be clear.</dd> |
| </dl> |
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