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| <div class="subTitle">org.apache.arrow.algorithm.dictionary</div> |
| <h2 title="Class HashTableDictionaryEncoder" class="title">Class HashTableDictionaryEncoder<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/ElementAddressableVector.html" title="interface in org.apache.arrow.vector">ElementAddressableVector</a>></h2> |
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| <li>org.apache.arrow.algorithm.dictionary.HashTableDictionaryEncoder<E,D></li> |
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| <dl> |
| <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> |
| </dl> |
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| <br> |
| <pre>public class <span class="typeNameLabel">HashTableDictionaryEncoder<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/ElementAddressableVector.html" title="interface in org.apache.arrow.vector">ElementAddressableVector</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 hash table.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/algorithm/dictionary/HashTableDictionaryEncoder.html#HashTableDictionaryEncoder-D-">HashTableDictionaryEncoder</a></span>(<a href="../../../../../org/apache/arrow/algorithm/dictionary/HashTableDictionaryEncoder.html" title="type parameter in HashTableDictionaryEncoder">D</a> dictionary)</code> |
| <div class="block">Constructs a dictionary encoder.</div> |
| </td> |
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| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/algorithm/dictionary/HashTableDictionaryEncoder.html#HashTableDictionaryEncoder-D-boolean-">HashTableDictionaryEncoder</a></span>(<a href="../../../../../org/apache/arrow/algorithm/dictionary/HashTableDictionaryEncoder.html" title="type parameter in HashTableDictionaryEncoder">D</a> dictionary, |
| boolean encodeNull)</code> |
| <div class="block">Constructs a dictionary encoder.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/algorithm/dictionary/HashTableDictionaryEncoder.html#HashTableDictionaryEncoder-D-boolean-org.apache.arrow.memory.util.hash.ArrowBufHasher-">HashTableDictionaryEncoder</a></span>(<a href="../../../../../org/apache/arrow/algorithm/dictionary/HashTableDictionaryEncoder.html" title="type parameter in HashTableDictionaryEncoder">D</a> dictionary, |
| boolean encodeNull, |
| <a href="../../../../../org/apache/arrow/memory/util/hash/ArrowBufHasher.html" title="interface in org.apache.arrow.memory.util.hash">ArrowBufHasher</a> hasher)</code> |
| <div class="block">Constructs a dictionary encoder.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
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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/HashTableDictionaryEncoder.html#encode-D-E-">encode</a></span>(<a href="../../../../../org/apache/arrow/algorithm/dictionary/HashTableDictionaryEncoder.html" title="type parameter in HashTableDictionaryEncoder">D</a> input, |
| <a href="../../../../../org/apache/arrow/algorithm/dictionary/HashTableDictionaryEncoder.html" title="type parameter in HashTableDictionaryEncoder">E</a> output)</code> |
| <div class="block">Encodes an input vector by a hash table.</div> |
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| <h4>HashTableDictionaryEncoder</h4> |
| <pre>public HashTableDictionaryEncoder(<a href="../../../../../org/apache/arrow/algorithm/dictionary/HashTableDictionaryEncoder.html" title="type parameter in HashTableDictionaryEncoder">D</a> dictionary)</pre> |
| <div class="block">Constructs a dictionary encoder.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>dictionary</code> - the dictionary.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="HashTableDictionaryEncoder-org.apache.arrow.vector.ElementAddressableVector-boolean-"> |
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| </a><a name="HashTableDictionaryEncoder-D-boolean-"> |
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| <h4>HashTableDictionaryEncoder</h4> |
| <pre>public HashTableDictionaryEncoder(<a href="../../../../../org/apache/arrow/algorithm/dictionary/HashTableDictionaryEncoder.html" title="type parameter in HashTableDictionaryEncoder">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.</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/decoding. |
| <li> |
| For 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. |
| </li> |
| <li> |
| For decoding, when a null is encountered in the input, |
| 1) If the flag is set to true, the decoder should never expect a null in the input. |
| 2) If set to false, the decoder simply produces a null in the output. |
| </li></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="HashTableDictionaryEncoder-org.apache.arrow.vector.ElementAddressableVector-boolean-org.apache.arrow.memory.util.hash.ArrowBufHasher-"> |
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| </a><a name="HashTableDictionaryEncoder-D-boolean-org.apache.arrow.memory.util.hash.ArrowBufHasher-"> |
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| <h4>HashTableDictionaryEncoder</h4> |
| <pre>public HashTableDictionaryEncoder(<a href="../../../../../org/apache/arrow/algorithm/dictionary/HashTableDictionaryEncoder.html" title="type parameter in HashTableDictionaryEncoder">D</a> dictionary, |
| boolean encodeNull, |
| <a href="../../../../../org/apache/arrow/memory/util/hash/ArrowBufHasher.html" title="interface in org.apache.arrow.memory.util.hash">ArrowBufHasher</a> hasher)</pre> |
| <div class="block">Constructs a dictionary encoder.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>dictionary</code> - the dictionary.</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> |
| <dd><code>hasher</code> - the hasher used to calculate the hash code.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <a name="encode-org.apache.arrow.vector.ElementAddressableVector-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/HashTableDictionaryEncoder.html" title="type parameter in HashTableDictionaryEncoder">D</a> input, |
| <a href="../../../../../org/apache/arrow/algorithm/dictionary/HashTableDictionaryEncoder.html" title="type parameter in HashTableDictionaryEncoder">E</a> output)</pre> |
| <div class="block">Encodes an input vector by a hash table. |
| So the algorithm takes O(n) time, where n is the length of the input vector.</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/HashTableDictionaryEncoder.html" title="type parameter in HashTableDictionaryEncoder">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/HashTableDictionaryEncoder.html" title="type parameter in HashTableDictionaryEncoder">D</a> extends <a href="../../../../../org/apache/arrow/vector/ElementAddressableVector.html" title="interface in org.apache.arrow.vector">ElementAddressableVector</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.</dd> |
| </dl> |
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