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<div class="subTitle">org.apache.spark.sql.expressions</div>
<h2 title="Class UserDefinedAggregateFunction" class="title">Class UserDefinedAggregateFunction</h2>
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<li>java.lang.Object</li>
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<pre>public abstract class <span class="strong">UserDefinedAggregateFunction</span>
extends java.lang.Object
implements scala.Serializable</pre>
<div class="block">:: Experimental ::
The base class for implementing user-defined aggregate functions (UDAF).</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../serialized-form.html#org.apache.spark.sql.expressions.UserDefinedAggregateFunction">Serialized Form</a></dd></dl>
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<td class="colOne"><code><strong><a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html#UserDefinedAggregateFunction()">UserDefinedAggregateFunction</a></strong>()</code> </td>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html#apply(org.apache.spark.sql.Column...)">apply</a></strong>(<a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a>... exprs)</code>
<div class="block">Creates a <code>Column</code> for this UDAF using given <code>Column</code>s as input arguments.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html#apply(scala.collection.Seq)">apply</a></strong>(scala.collection.Seq<<a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a>> exprs)</code>
<div class="block">Creates a <code>Column</code> for this UDAF using given <code>Column</code>s as input arguments.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>abstract <a href="../../../../../org/apache/spark/sql/types/StructType.html" title="class in org.apache.spark.sql.types">StructType</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html#bufferSchema()">bufferSchema</a></strong>()</code>
<div class="block">A <code>StructType</code> represents data types of values in the aggregation buffer.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>abstract <a href="../../../../../org/apache/spark/sql/types/DataType.html" title="class in org.apache.spark.sql.types">DataType</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html#dataType()">dataType</a></strong>()</code>
<div class="block">The <code>DataType</code> of the returned value of this <a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html" title="class in org.apache.spark.sql.expressions"><code>UserDefinedAggregateFunction</code></a>.</div>
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<td class="colFirst"><code>abstract boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html#deterministic()">deterministic</a></strong>()</code>
<div class="block">Returns true iff this function is deterministic, i.e.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html#distinct(org.apache.spark.sql.Column...)">distinct</a></strong>(<a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a>... exprs)</code>
<div class="block">Creates a <code>Column</code> for this UDAF using the distinct values of the given
<code>Column</code>s as input arguments.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html#distinct(scala.collection.Seq)">distinct</a></strong>(scala.collection.Seq<<a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a>> exprs)</code>
<div class="block">Creates a <code>Column</code> for this UDAF using the distinct values of the given
<code>Column</code>s as input arguments.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>abstract java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html#evaluate(org.apache.spark.sql.Row)">evaluate</a></strong>(<a href="../../../../../org/apache/spark/sql/Row.html" title="interface in org.apache.spark.sql">Row</a> buffer)</code>
<div class="block">Calculates the final result of this <a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html" title="class in org.apache.spark.sql.expressions"><code>UserDefinedAggregateFunction</code></a> based on the given
aggregation buffer.</div>
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<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html#initialize(org.apache.spark.sql.expressions.MutableAggregationBuffer)">initialize</a></strong>(<a href="../../../../../org/apache/spark/sql/expressions/MutableAggregationBuffer.html" title="class in org.apache.spark.sql.expressions">MutableAggregationBuffer</a> buffer)</code>
<div class="block">Initializes the given aggregation buffer, i.e.</div>
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<td class="colFirst"><code>abstract <a href="../../../../../org/apache/spark/sql/types/StructType.html" title="class in org.apache.spark.sql.types">StructType</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html#inputSchema()">inputSchema</a></strong>()</code>
<div class="block">A <code>StructType</code> represents data types of input arguments of this aggregate function.</div>
</td>
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<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html#merge(org.apache.spark.sql.expressions.MutableAggregationBuffer, org.apache.spark.sql.Row)">merge</a></strong>(<a href="../../../../../org/apache/spark/sql/expressions/MutableAggregationBuffer.html" title="class in org.apache.spark.sql.expressions">MutableAggregationBuffer</a> buffer1,
<a href="../../../../../org/apache/spark/sql/Row.html" title="interface in org.apache.spark.sql">Row</a> buffer2)</code>
<div class="block">Merges two aggregation buffers and stores the updated buffer values back to <code>buffer1</code>.</div>
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<td class="colFirst"><code>abstract void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html#update(org.apache.spark.sql.expressions.MutableAggregationBuffer, org.apache.spark.sql.Row)">update</a></strong>(<a href="../../../../../org/apache/spark/sql/expressions/MutableAggregationBuffer.html" title="class in org.apache.spark.sql.expressions">MutableAggregationBuffer</a> buffer,
<a href="../../../../../org/apache/spark/sql/Row.html" title="interface in org.apache.spark.sql">Row</a> input)</code>
<div class="block">Updates the given aggregation buffer <code>buffer</code> with new input data from <code>input</code>.</div>
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<pre>public UserDefinedAggregateFunction()</pre>
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<pre>public <a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a> apply(<a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a>... exprs)</pre>
<div class="block">Creates a <code>Column</code> for this UDAF using given <code>Column</code>s as input arguments.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>exprs</code> - (undocumented)</dd>
<dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public <a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a> distinct(<a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a>... exprs)</pre>
<div class="block">Creates a <code>Column</code> for this UDAF using the distinct values of the given
<code>Column</code>s as input arguments.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>exprs</code> - (undocumented)</dd>
<dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public abstract <a href="../../../../../org/apache/spark/sql/types/StructType.html" title="class in org.apache.spark.sql.types">StructType</a> inputSchema()</pre>
<div class="block">A <code>StructType</code> represents data types of input arguments of this aggregate function.
For example, if a <a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html" title="class in org.apache.spark.sql.expressions"><code>UserDefinedAggregateFunction</code></a> expects two input arguments
with type of <code>DoubleType</code> and <code>LongType</code>, the returned <code>StructType</code> will look like
<p>
<code></code><code>
new StructType()
.add("doubleInput", DoubleType)
.add("longInput", LongType)
</code><code></code>
<p>
The name of a field of this <code>StructType</code> is only used to identify the corresponding
input argument. Users can choose names to identify the input arguments.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public abstract <a href="../../../../../org/apache/spark/sql/types/StructType.html" title="class in org.apache.spark.sql.types">StructType</a> bufferSchema()</pre>
<div class="block">A <code>StructType</code> represents data types of values in the aggregation buffer.
For example, if a <a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html" title="class in org.apache.spark.sql.expressions"><code>UserDefinedAggregateFunction</code></a>'s buffer has two values
(i.e. two intermediate values) with type of <code>DoubleType</code> and <code>LongType</code>,
the returned <code>StructType</code> will look like
<p>
<code></code><code>
new StructType()
.add("doubleInput", DoubleType)
.add("longInput", LongType)
</code><code></code>
<p>
The name of a field of this <code>StructType</code> is only used to identify the corresponding
buffer value. Users can choose names to identify the input arguments.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public abstract <a href="../../../../../org/apache/spark/sql/types/DataType.html" title="class in org.apache.spark.sql.types">DataType</a> dataType()</pre>
<div class="block">The <code>DataType</code> of the returned value of this <a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html" title="class in org.apache.spark.sql.expressions"><code>UserDefinedAggregateFunction</code></a>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public abstract boolean deterministic()</pre>
<div class="block">Returns true iff this function is deterministic, i.e. given the same input,
always return the same output.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public abstract void initialize(<a href="../../../../../org/apache/spark/sql/expressions/MutableAggregationBuffer.html" title="class in org.apache.spark.sql.expressions">MutableAggregationBuffer</a> buffer)</pre>
<div class="block">Initializes the given aggregation buffer, i.e. the zero value of the aggregation buffer.
<p>
The contract should be that applying the merge function on two initial buffers should just
return the initial buffer itself, i.e.
<code>merge(initialBuffer, initialBuffer)</code> should equal <code>initialBuffer</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>buffer</code> - (undocumented)</dd></dl>
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<pre>public abstract void update(<a href="../../../../../org/apache/spark/sql/expressions/MutableAggregationBuffer.html" title="class in org.apache.spark.sql.expressions">MutableAggregationBuffer</a> buffer,
<a href="../../../../../org/apache/spark/sql/Row.html" title="interface in org.apache.spark.sql">Row</a> input)</pre>
<div class="block">Updates the given aggregation buffer <code>buffer</code> with new input data from <code>input</code>.
<p>
This is called once per input row.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>buffer</code> - (undocumented)</dd><dd><code>input</code> - (undocumented)</dd></dl>
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<pre>public abstract void merge(<a href="../../../../../org/apache/spark/sql/expressions/MutableAggregationBuffer.html" title="class in org.apache.spark.sql.expressions">MutableAggregationBuffer</a> buffer1,
<a href="../../../../../org/apache/spark/sql/Row.html" title="interface in org.apache.spark.sql">Row</a> buffer2)</pre>
<div class="block">Merges two aggregation buffers and stores the updated buffer values back to <code>buffer1</code>.
<p>
This is called when we merge two partially aggregated data together.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>buffer1</code> - (undocumented)</dd><dd><code>buffer2</code> - (undocumented)</dd></dl>
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<h4>evaluate</h4>
<pre>public abstract java.lang.Object evaluate(<a href="../../../../../org/apache/spark/sql/Row.html" title="interface in org.apache.spark.sql">Row</a> buffer)</pre>
<div class="block">Calculates the final result of this <a href="../../../../../org/apache/spark/sql/expressions/UserDefinedAggregateFunction.html" title="class in org.apache.spark.sql.expressions"><code>UserDefinedAggregateFunction</code></a> based on the given
aggregation buffer.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>buffer</code> - (undocumented)</dd>
<dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public <a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a> apply(scala.collection.Seq<<a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a>> exprs)</pre>
<div class="block">Creates a <code>Column</code> for this UDAF using given <code>Column</code>s as input arguments.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>exprs</code> - (undocumented)</dd>
<dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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<pre>public <a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a> distinct(scala.collection.Seq<<a href="../../../../../org/apache/spark/sql/Column.html" title="class in org.apache.spark.sql">Column</a>> exprs)</pre>
<div class="block">Creates a <code>Column</code> for this UDAF using the distinct values of the given
<code>Column</code>s as input arguments.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>exprs</code> - (undocumented)</dd>
<dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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