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| <div class="subTitle">org.apache.arrow.algorithm.search</div> |
| <h2 title="Class ParallelSearcher" class="title">Class ParallelSearcher<V 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.search.ParallelSearcher<V></li> |
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| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>V</code> - the vector type.</dd> |
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| <hr> |
| <br> |
| <pre>public class <span class="typeNameLabel">ParallelSearcher<V 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></pre> |
| <div class="block">Search for a value in the vector by multiple threads. |
| This is often used in scenarios where the vector is large or |
| low response time is required.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/algorithm/search/ParallelSearcher.html#ParallelSearcher-V-java.util.concurrent.ExecutorService-int-">ParallelSearcher</a></span>(<a href="../../../../../org/apache/arrow/algorithm/search/ParallelSearcher.html" title="type parameter in ParallelSearcher">V</a> vector, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html?is-external=true" title="class or interface in java.util.concurrent">ExecutorService</a> threadPool, |
| int numThreads)</code> |
| <div class="block">Constructs a parallel searcher.</div> |
| </td> |
| </tr> |
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| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/algorithm/search/ParallelSearcher.html#search-V-int-">search</a></span>(<a href="../../../../../org/apache/arrow/algorithm/search/ParallelSearcher.html" title="type parameter in ParallelSearcher">V</a> keyVector, |
| int keyIndex)</code> |
| <div class="block">Search for the key in the target vector.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/algorithm/search/ParallelSearcher.html#search-V-int-org.apache.arrow.algorithm.sort.VectorValueComparator-">search</a></span>(<a href="../../../../../org/apache/arrow/algorithm/search/ParallelSearcher.html" title="type parameter in ParallelSearcher">V</a> keyVector, |
| int keyIndex, |
| <a href="../../../../../org/apache/arrow/algorithm/sort/VectorValueComparator.html" title="class in org.apache.arrow.algorithm.sort">VectorValueComparator</a><<a href="../../../../../org/apache/arrow/algorithm/search/ParallelSearcher.html" title="type parameter in ParallelSearcher">V</a>> comparator)</code> |
| <div class="block">Search for the key in the target vector.</div> |
| </td> |
| </tr> |
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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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| <a name="ParallelSearcher-org.apache.arrow.vector.ValueVector-java.util.concurrent.ExecutorService-int-"> |
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| </a><a name="ParallelSearcher-V-java.util.concurrent.ExecutorService-int-"> |
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| <h4>ParallelSearcher</h4> |
| <pre>public ParallelSearcher(<a href="../../../../../org/apache/arrow/algorithm/search/ParallelSearcher.html" title="type parameter in ParallelSearcher">V</a> vector, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html?is-external=true" title="class or interface in java.util.concurrent">ExecutorService</a> threadPool, |
| int numThreads)</pre> |
| <div class="block">Constructs a parallel searcher.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>vector</code> - the vector to search.</dd> |
| <dd><code>threadPool</code> - the thread pool to use.</dd> |
| <dd><code>numThreads</code> - the number of threads to use.</dd> |
| </dl> |
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| <a name="search-org.apache.arrow.vector.ValueVector-int-"> |
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| <h4>search</h4> |
| <pre>public int search(<a href="../../../../../org/apache/arrow/algorithm/search/ParallelSearcher.html" title="type parameter in ParallelSearcher">V</a> keyVector, |
| int keyIndex) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre> |
| <div class="block">Search for the key in the target vector. The element-wise comparison is based on |
| <a href="../../../../../org/apache/arrow/vector/compare/RangeEqualsVisitor.html" title="class in org.apache.arrow.vector.compare"><code>RangeEqualsVisitor</code></a>, so there are two possible results for each element-wise |
| comparison: equal and un-equal.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>keyVector</code> - the vector containing the search key.</dd> |
| <dd><code>keyIndex</code> - the index of the search key in the key vector.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the position of a matched value in the target vector, |
| or -1 if none is found. Please note that if there are multiple |
| matches of the key in the target vector, this method makes no |
| guarantees about which instance is returned. |
| For an alternative search implementation that always finds the first match of the key, |
| see <a href="../../../../../org/apache/arrow/algorithm/search/VectorSearcher.html#linearSearch-V-org.apache.arrow.algorithm.sort.VectorValueComparator-V-int-"><code>VectorSearcher.linearSearch(ValueVector, VectorValueComparator, ValueVector, int)</code></a>.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</a></code> - if an exception occurs in a thread.</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code> - if a thread is interrupted.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>search</h4> |
| <pre>public int search(<a href="../../../../../org/apache/arrow/algorithm/search/ParallelSearcher.html" title="type parameter in ParallelSearcher">V</a> keyVector, |
| int keyIndex, |
| <a href="../../../../../org/apache/arrow/algorithm/sort/VectorValueComparator.html" title="class in org.apache.arrow.algorithm.sort">VectorValueComparator</a><<a href="../../../../../org/apache/arrow/algorithm/search/ParallelSearcher.html" title="type parameter in ParallelSearcher">V</a>> comparator) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre> |
| <div class="block">Search for the key in the target vector. The element-wise comparison is based on |
| <a href="../../../../../org/apache/arrow/algorithm/sort/VectorValueComparator.html" title="class in org.apache.arrow.algorithm.sort"><code>VectorValueComparator</code></a>, so there are three possible results for each element-wise |
| comparison: less than, equal to and greater than.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>keyVector</code> - the vector containing the search key.</dd> |
| <dd><code>keyIndex</code> - the index of the search key in the key vector.</dd> |
| <dd><code>comparator</code> - the comparator for comparing the key against vector elements.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the position of a matched value in the target vector, |
| or -1 if none is found. Please note that if there are multiple |
| matches of the key in the target vector, this method makes no |
| guarantees about which instance is returned. |
| For an alternative search implementation that always finds the first match of the key, |
| see <a href="../../../../../org/apache/arrow/algorithm/search/VectorSearcher.html#linearSearch-V-org.apache.arrow.algorithm.sort.VectorValueComparator-V-int-"><code>VectorSearcher.linearSearch(ValueVector, VectorValueComparator, ValueVector, int)</code></a>.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</a></code> - if an exception occurs in a thread.</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code> - if a thread is interrupted.</dd> |
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