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| <div class="subTitle">org.apache.spark.sql.expressions</div> |
| <h2 title="Class Aggregator" class="title">Class Aggregator<IN,BUF,OUT></h2> |
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| <ul class="inheritance"> |
| <li>Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.spark.sql.expressions.Aggregator<IN,BUF,OUT></li> |
| </ul> |
| </li> |
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| <div class="description"> |
| <ul class="blockList"> |
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| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>IN</code> - The input type for the aggregation.</dd> |
| <dd><code>BUF</code> - The type of the intermediate value of the reduction.</dd> |
| <dd><code>OUT</code> - The type of the final output result.</dd> |
| </dl> |
| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd>java.io.Serializable</dd> |
| </dl> |
| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../../org/apache/spark/ml/feature/StringIndexerAggregator.html" title="class in org.apache.spark.ml.feature">StringIndexerAggregator</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public abstract class <span class="typeNameLabel">Aggregator<IN,BUF,OUT></span> |
| extends Object |
| implements scala.Serializable</pre> |
| <div class="block">A base class for user-defined aggregations, which can be used in <code>Dataset</code> operations to take |
| all of the elements of a group and reduce them to a single value. |
| <p> |
| For example, the following aggregator extracts an <code>int</code> from a specific class and adds them up: |
| <pre><code> |
| case class Data(i: Int) |
| |
| val customSummer = new Aggregator[Data, Int, Int] { |
| def zero: Int = 0 |
| def reduce(b: Int, a: Data): Int = b + a.i |
| def merge(b1: Int, b2: Int): Int = b1 + b2 |
| def finish(r: Int): Int = r |
| def bufferEncoder: Encoder[Int] = Encoders.scalaInt |
| def outputEncoder: Encoder[Int] = Encoders.scalaInt |
| }.toColumn() |
| |
| val ds: Dataset[Data] = ... |
| val aggregated = ds.select(customSummer) |
| </code></pre> |
| <p> |
| Based loosely on Aggregator from Algebird: https://github.com/twitter/algebird |
| <p></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.6.0</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../serialized-form.html#org.apache.spark.sql.expressions.Aggregator">Serialized Form</a></dd> |
| </dl> |
| </li> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html#Aggregator--">Aggregator</a></span>()</code> </td> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>abstract <a href="../../../../../org/apache/spark/sql/Encoder.html" title="interface in org.apache.spark.sql">Encoder</a><<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html#bufferEncoder--">bufferEncoder</a></span>()</code> |
| <div class="block">Specifies the <code>Encoder</code> for the intermediate value type.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>abstract <a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">OUT</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html#finish-BUF-">finish</a></span>(<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a> reduction)</code> |
| <div class="block">Transform the output of the reduction.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>abstract <a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html#merge-BUF-BUF-">merge</a></span>(<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a> b1, |
| <a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a> b2)</code> |
| <div class="block">Merge two intermediate values.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>abstract <a href="../../../../../org/apache/spark/sql/Encoder.html" title="interface in org.apache.spark.sql">Encoder</a><<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">OUT</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html#outputEncoder--">outputEncoder</a></span>()</code> |
| <div class="block">Specifies the <code>Encoder</code> for the final output value type.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>abstract <a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html#reduce-BUF-IN-">reduce</a></span>(<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a> b, |
| <a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">IN</a> a)</code> |
| <div class="block">Combine two values to produce a new value.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/spark/sql/TypedColumn.html" title="class in org.apache.spark.sql">TypedColumn</a><<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">IN</a>,<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">OUT</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html#toColumn--">toColumn</a></span>()</code> |
| <div class="block">Returns this <code>Aggregator</code> as a <code>TypedColumn</code> that can be used in <code>Dataset</code>.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>abstract <a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html#zero--">zero</a></span>()</code> |
| <div class="block">A zero value for this aggregation.</div> |
| </td> |
| </tr> |
| </table> |
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| <!-- --> |
| </a> |
| <h3>Methods inherited from class Object</h3> |
| <code>equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
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| <li class="blockList"><a name="constructor.detail"> |
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| </a> |
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| <a name="Aggregator--"> |
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| </a> |
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| <h4>Aggregator</h4> |
| <pre>public Aggregator()</pre> |
| </li> |
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| <h4>bufferEncoder</h4> |
| <pre>public abstract <a href="../../../../../org/apache/spark/sql/Encoder.html" title="interface in org.apache.spark.sql">Encoder</a><<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a>> bufferEncoder()</pre> |
| <div class="block">Specifies the <code>Encoder</code> for the intermediate value type.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>(undocumented)</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.0.0</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="finish-java.lang.Object-"> |
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| </a><a name="finish-BUF-"> |
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| <h4>finish</h4> |
| <pre>public abstract <a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">OUT</a> finish(<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a> reduction)</pre> |
| <div class="block">Transform the output of the reduction.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>reduction</code> - (undocumented)</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>(undocumented)</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.6.0</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="merge-java.lang.Object-java.lang.Object-"> |
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| </a><a name="merge-BUF-BUF-"> |
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| <h4>merge</h4> |
| <pre>public abstract <a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a> merge(<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a> b1, |
| <a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a> b2)</pre> |
| <div class="block">Merge two intermediate values.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>b1</code> - (undocumented)</dd> |
| <dd><code>b2</code> - (undocumented)</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>(undocumented)</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.6.0</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="outputEncoder--"> |
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| </a> |
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| <h4>outputEncoder</h4> |
| <pre>public abstract <a href="../../../../../org/apache/spark/sql/Encoder.html" title="interface in org.apache.spark.sql">Encoder</a><<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">OUT</a>> outputEncoder()</pre> |
| <div class="block">Specifies the <code>Encoder</code> for the final output value type.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>(undocumented)</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.0.0</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="reduce-java.lang.Object-java.lang.Object-"> |
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| </a><a name="reduce-BUF-IN-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>reduce</h4> |
| <pre>public abstract <a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a> reduce(<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a> b, |
| <a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">IN</a> a)</pre> |
| <div class="block">Combine two values to produce a new value. For performance, the function may modify <code>b</code> and |
| return it instead of constructing new object for b.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>b</code> - (undocumented)</dd> |
| <dd><code>a</code> - (undocumented)</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>(undocumented)</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.6.0</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="toColumn--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>toColumn</h4> |
| <pre>public <a href="../../../../../org/apache/spark/sql/TypedColumn.html" title="class in org.apache.spark.sql">TypedColumn</a><<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">IN</a>,<a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">OUT</a>> toColumn()</pre> |
| <div class="block">Returns this <code>Aggregator</code> as a <code>TypedColumn</code> that can be used in <code>Dataset</code>. |
| operations.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>(undocumented)</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.6.0</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="zero--"> |
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| </a> |
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| <h4>zero</h4> |
| <pre>public abstract <a href="../../../../../org/apache/spark/sql/expressions/Aggregator.html" title="type parameter in Aggregator">BUF</a> zero()</pre> |
| <div class="block">A zero value for this aggregation. Should satisfy the property that any b + zero = b.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>(undocumented)</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.6.0</dd> |
| </dl> |
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