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+<div class="subTitle">org.apache.spark.api.java.function</div>
+<h2 title="Interface CoGroupFunction" class="title">Interface 
CoGroupFunction&lt;K,V1,V2,R&gt;</h2>
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+<dd>This is a functional interface and can therefore be used as the assignment 
target for a lambda expression or method reference.</dd>
+</dl>
+<hr>
+<br>
+<pre>@FunctionalInterface
+public interface <span 
class="typeNameLabel">CoGroupFunction&lt;K,V1,V2,R&gt;</span>
+extends java.io.Serializable</pre>
+<div class="block">A function that returns zero or more output records from 
each grouping key and its values from 2
+ Datasets.</div>
+</li>
+</ul>
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summary="Method Summary table, listing methods, and an explanation">
+<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span 
class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a 
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+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr id="i0" class="altColor">
+<td class="colFirst"><code>java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/CoGroupFunction.html"
 title="type parameter in CoGroupFunction">R</a>&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../../org/apache/spark/api/java/function/CoGroupFunction.html#call-K-java.util.Iterator-java.util.Iterator-">call</a></span>(<a
 
href="../../../../../../org/apache/spark/api/java/function/CoGroupFunction.html"
 title="type parameter in CoGroupFunction">K</a>&nbsp;key,
+    java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/CoGroupFunction.html"
 title="type parameter in CoGroupFunction">V1</a>&gt;&nbsp;left,
+    java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/CoGroupFunction.html"
 title="type parameter in 
CoGroupFunction">V2</a>&gt;&nbsp;right)</code>&nbsp;</td>
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+<h4>call</h4>
+<pre>java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/CoGroupFunction.html"
 title="type parameter in CoGroupFunction">R</a>&gt;&nbsp;call(<a 
href="../../../../../../org/apache/spark/api/java/function/CoGroupFunction.html"
 title="type parameter in CoGroupFunction">K</a>&nbsp;key,
+                           java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/CoGroupFunction.html"
 title="type parameter in CoGroupFunction">V1</a>&gt;&nbsp;left,
+                           java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/CoGroupFunction.html"
 title="type parameter in CoGroupFunction">V2</a>&gt;&nbsp;right)
+                    throws Exception</pre>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code>Exception</code></dd>
+</dl>
+</li>
+</ul>
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b/site/docs/2.2.1/api/java/org/apache/spark/api/java/function/DoubleFlatMapFunction.html
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+<div class="subTitle">org.apache.spark.api.java.function</div>
+<h2 title="Interface DoubleFlatMapFunction" class="title">Interface 
DoubleFlatMapFunction&lt;T&gt;</h2>
+</div>
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+<dt>All Superinterfaces:</dt>
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+<dt>Functional Interface:</dt>
+<dd>This is a functional interface and can therefore be used as the assignment 
target for a lambda expression or method reference.</dd>
+</dl>
+<hr>
+<br>
+<pre>@FunctionalInterface
+public interface <span 
class="typeNameLabel">DoubleFlatMapFunction&lt;T&gt;</span>
+extends java.io.Serializable</pre>
+<div class="block">A function that returns zero or more records of type Double 
from each input record.</div>
+</li>
+</ul>
+</div>
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summary="Method Summary table, listing methods, and an explanation">
+<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span 
class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a 
href="javascript:show(2);">Instance Methods</a></span><span 
class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a 
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class="tabEnd">&nbsp;</span></span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr id="i0" class="altColor">
+<td class="colFirst"><code>java.util.Iterator&lt;Double&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../../org/apache/spark/api/java/function/DoubleFlatMapFunction.html#call-T-">call</a></span>(<a
 
href="../../../../../../org/apache/spark/api/java/function/DoubleFlatMapFunction.html"
 title="type parameter in DoubleFlatMapFunction">T</a>&nbsp;t)</code>&nbsp;</td>
+</tr>
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+<h4>call</h4>
+<pre>java.util.Iterator&lt;Double&gt;&nbsp;call(<a 
href="../../../../../../org/apache/spark/api/java/function/DoubleFlatMapFunction.html"
 title="type parameter in DoubleFlatMapFunction">T</a>&nbsp;t)
+                         throws Exception</pre>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code>Exception</code></dd>
+</dl>
+</li>
+</ul>
+</li>
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target for a lambda expression or method reference.</dd>
+</dl>
+<hr>
+<br>
+<pre>@FunctionalInterface
+public interface <span class="typeNameLabel">DoubleFunction&lt;T&gt;</span>
+extends java.io.Serializable</pre>
+<div class="block">A function that returns Doubles, and can be used to 
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+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
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+<tr id="i0" class="altColor">
+<td class="colFirst"><code>double</code></td>
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href="../../../../../../org/apache/spark/api/java/function/DoubleFunction.html#call-T-">call</a></span>(<a
 
href="../../../../../../org/apache/spark/api/java/function/DoubleFunction.html" 
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href="../../../../../../org/apache/spark/api/java/function/DoubleFunction.html" 
title="type parameter in DoubleFunction">T</a>&nbsp;t)
+     throws Exception</pre>
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target for a lambda expression or method reference.</dd>
+</dl>
+<hr>
+<br>
+<pre>@FunctionalInterface
+public interface <span class="typeNameLabel">FilterFunction&lt;T&gt;</span>
+extends java.io.Serializable</pre>
+<div class="block">Base interface for a function used in Dataset's filter 
function.
+
+ If the function returns true, the element is included in the returned 
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href="../../../../../../org/apache/spark/api/java/function/FilterFunction.html" 
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href="../../../../../../org/apache/spark/api/java/function/FilterFunction.html" 
title="type parameter in FilterFunction">T</a>&nbsp;value)
+      throws Exception</pre>
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+<dt><span class="throwsLabel">Throws:</span></dt>
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+</dl>
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+<div class="subTitle">org.apache.spark.api.java.function</div>
+<h2 title="Interface FlatMapFunction" class="title">Interface 
FlatMapFunction&lt;T,R&gt;</h2>
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target for a lambda expression or method reference.</dd>
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each input record.</div>
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href="javascript:show(2);">Instance Methods</a></span><span 
class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a 
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+<tr id="i0" class="altColor">
+<td class="colFirst"><code>java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapFunction.html"
 title="type parameter in FlatMapFunction">R</a>&gt;</code></td>
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href="../../../../../../org/apache/spark/api/java/function/FlatMapFunction.html#call-T-">call</a></span>(<a
 
href="../../../../../../org/apache/spark/api/java/function/FlatMapFunction.html"
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href="../../../../../../org/apache/spark/api/java/function/FlatMapFunction.html"
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href="../../../../../../org/apache/spark/api/java/function/FlatMapFunction.html"
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+</dl>
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+<h2 title="Interface FlatMapFunction2" class="title">Interface 
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+<dd>This is a functional interface and can therefore be used as the assignment 
target for a lambda expression or method reference.</dd>
+</dl>
+<hr>
+<br>
+<pre>@FunctionalInterface
+public interface <span 
class="typeNameLabel">FlatMapFunction2&lt;T1,T2,R&gt;</span>
+extends java.io.Serializable</pre>
+<div class="block">A function that takes two inputs and returns zero or more 
output records.</div>
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class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a 
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+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
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+<tr id="i0" class="altColor">
+<td class="colFirst"><code>java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapFunction2.html"
 title="type parameter in FlatMapFunction2">R</a>&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapFunction2.html#call-T1-T2-">call</a></span>(<a
 
href="../../../../../../org/apache/spark/api/java/function/FlatMapFunction2.html"
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 title="type parameter in FlatMapFunction2">T2</a>&nbsp;t2)</code>&nbsp;</td>
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href="../../../../../../org/apache/spark/api/java/function/FlatMapFunction2.html"
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href="../../../../../../org/apache/spark/api/java/function/FlatMapFunction2.html"
 title="type parameter in FlatMapFunction2">T1</a>&nbsp;t1,
+                           <a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapFunction2.html"
 title="type parameter in FlatMapFunction2">T2</a>&nbsp;t2)
+                    throws Exception</pre>
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+<div class="subTitle">org.apache.spark.api.java.function</div>
+<h2 title="Interface FlatMapGroupsFunction" class="title">Interface 
FlatMapGroupsFunction&lt;K,V,R&gt;</h2>
+</div>
+<div class="contentContainer">
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Superinterfaces:</dt>
+<dd>java.io.Serializable</dd>
+</dl>
+<dl>
+<dt>Functional Interface:</dt>
+<dd>This is a functional interface and can therefore be used as the assignment 
target for a lambda expression or method reference.</dd>
+</dl>
+<hr>
+<br>
+<pre>@FunctionalInterface
+public interface <span 
class="typeNameLabel">FlatMapGroupsFunction&lt;K,V,R&gt;</span>
+extends java.io.Serializable</pre>
+<div class="block">A function that returns zero or more output records from 
each grouping key and its values.</div>
+</li>
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+<li class="blockList">
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summary="Method Summary table, listing methods, and an explanation">
+<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span 
class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a 
href="javascript:show(2);">Instance Methods</a></span><span 
class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a 
href="javascript:show(4);">Abstract Methods</a></span><span 
class="tabEnd">&nbsp;</span></span></caption>
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+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr id="i0" class="altColor">
+<td class="colFirst"><code>java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsFunction.html"
 title="type parameter in FlatMapGroupsFunction">R</a>&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsFunction.html#call-K-java.util.Iterator-">call</a></span>(<a
 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsFunction.html"
 title="type parameter in FlatMapGroupsFunction">K</a>&nbsp;key,
+    java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsFunction.html"
 title="type parameter in 
FlatMapGroupsFunction">V</a>&gt;&nbsp;values)</code>&nbsp;</td>
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+<h4>call</h4>
+<pre>java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsFunction.html"
 title="type parameter in FlatMapGroupsFunction">R</a>&gt;&nbsp;call(<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsFunction.html"
 title="type parameter in FlatMapGroupsFunction">K</a>&nbsp;key,
+                           java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsFunction.html"
 title="type parameter in FlatMapGroupsFunction">V</a>&gt;&nbsp;values)
+                    throws Exception</pre>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code>Exception</code></dd>
+</dl>
+</li>
+</ul>
+</li>
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b/site/docs/2.2.1/api/java/org/apache/spark/api/java/function/FlatMapGroupsWithStateFunction.html
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+<!-- ========= END OF TOP NAVBAR ========= -->
+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.spark.api.java.function</div>
+<h2 title="Interface FlatMapGroupsWithStateFunction" class="title">Interface 
FlatMapGroupsWithStateFunction&lt;K,V,S,R&gt;</h2>
+</div>
+<div class="contentContainer">
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Superinterfaces:</dt>
+<dd>java.io.Serializable</dd>
+</dl>
+<hr>
+<br>
+<pre>@InterfaceStability.Evolving
+public interface <span 
class="typeNameLabel">FlatMapGroupsWithStateFunction&lt;K,V,S,R&gt;</span>
+extends java.io.Serializable</pre>
+<div class="block">::Experimental::
+ Base interface for a map function used in
+ <code>org.apache.spark.sql.KeyValueGroupedDataset.flatMapGroupsWithState(
+ FlatMapGroupsWithStateFunction, org.apache.spark.sql.streaming.OutputMode,
+ org.apache.spark.sql.Encoder, org.apache.spark.sql.Encoder)</code></div>
+<dl>
+<dt><span class="simpleTagLabel">Since:</span></dt>
+<dd>2.1.1</dd>
+</dl>
+</li>
+</ul>
+</div>
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+<li class="blockList">
+<!-- ========== METHOD SUMMARY =========== -->
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+</a>
+<h3>Method Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" 
summary="Method Summary table, listing methods, and an explanation">
+<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span 
class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a 
href="javascript:show(2);">Instance Methods</a></span><span 
class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a 
href="javascript:show(4);">Abstract Methods</a></span><span 
class="tabEnd">&nbsp;</span></span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr id="i0" class="altColor">
+<td class="colFirst"><code>java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsWithStateFunction.html"
 title="type parameter in FlatMapGroupsWithStateFunction">R</a>&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsWithStateFunction.html#call-K-java.util.Iterator-org.apache.spark.sql.streaming.GroupState-">call</a></span>(<a
 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsWithStateFunction.html"
 title="type parameter in FlatMapGroupsWithStateFunction">K</a>&nbsp;key,
+    java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsWithStateFunction.html"
 title="type parameter in FlatMapGroupsWithStateFunction">V</a>&gt;&nbsp;values,
+    <a href="../../../../../../org/apache/spark/sql/streaming/GroupState.html" 
title="interface in org.apache.spark.sql.streaming">GroupState</a>&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsWithStateFunction.html"
 title="type parameter in 
FlatMapGroupsWithStateFunction">S</a>&gt;&nbsp;state)</code>&nbsp;</td>
+</tr>
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+<a 
name="call-java.lang.Object-java.util.Iterator-org.apache.spark.sql.streaming.GroupState-">
+<!--   -->
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name="call-K-java.util.Iterator-org.apache.spark.sql.streaming.GroupState-">
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+<h4>call</h4>
+<pre>java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsWithStateFunction.html"
 title="type parameter in 
FlatMapGroupsWithStateFunction">R</a>&gt;&nbsp;call(<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsWithStateFunction.html"
 title="type parameter in FlatMapGroupsWithStateFunction">K</a>&nbsp;key,
+                           java.util.Iterator&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsWithStateFunction.html"
 title="type parameter in FlatMapGroupsWithStateFunction">V</a>&gt;&nbsp;values,
+                           <a 
href="../../../../../../org/apache/spark/sql/streaming/GroupState.html" 
title="interface in org.apache.spark.sql.streaming">GroupState</a>&lt;<a 
href="../../../../../../org/apache/spark/api/java/function/FlatMapGroupsWithStateFunction.html"
 title="type parameter in FlatMapGroupsWithStateFunction">S</a>&gt;&nbsp;state)
+                    throws Exception</pre>
+<dl>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code>Exception</code></dd>
+</dl>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
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