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<div class="subTitle">org.apache.beam.sdk.transforms</div>
<h2 title="Class MapValues" class="title">Class MapValues&lt;K,V1,V2&gt;</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">org.apache.beam.sdk.transforms.PTransform</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;K,V1&gt;&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;K,V2&gt;&gt;&gt;</li>
<li>
<ul class="inheritance">
<li>org.apache.beam.sdk.transforms.MapValues&lt;K,V1,V2&gt;</li>
</ul>
</li>
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<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>V1</code> - the type of the values in the input <code>PCollection</code></dd>
<dd><code>V2</code> - the type of the elements in the output <code>PCollection</code></dd>
</dl>
<dl>
<dt>All Implemented Interfaces:</dt>
<dd>java.io.Serializable, <a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></dd>
</dl>
<hr>
<br>
<pre>public class <span class="typeNameLabel">MapValues&lt;K,V1,V2&gt;</span>
extends <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;K,V1&gt;&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;K,V2&gt;&gt;&gt;</pre>
<div class="block"><code>MapValues</code> maps a <code>SerializableFunction&lt;V1,V2&gt;</code> over values of a <code>PCollection&lt;KV&lt;K,V1&gt;&gt;</code> and returns a <code>PCollection&lt;KV&lt;K, V2&gt;&gt;</code>.
<p>Example of use:
<pre><code>
PCollection&lt;KV&lt;String, Integer&gt;&gt; input = ...;
PCollection&lt;KV&lt;String, Double&gt; output =
input.apply(MapValues.into(TypeDescriptors.doubles()).via(Integer::doubleValue));
</code></pre>
<p>See also <a href="../../../../../org/apache/beam/sdk/transforms/MapKeys.html" title="class in org.apache.beam.sdk.transforms"><code>MapKeys</code></a>.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../serialized-form.html#org.apache.beam.sdk.transforms.MapValues">Serialized Form</a></dd>
</dl>
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<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#name">name</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#resourceHints">resourceHints</a></code></li>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></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="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete 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>&lt;FailureT&gt;&nbsp;org.apache.beam.sdk.transforms.SimpleMapWithFailures&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V1</a>&gt;,<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V2</a>&gt;,FailureT&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html#exceptionsInto-org.apache.beam.sdk.values.TypeDescriptor-">exceptionsInto</a></span>(<a href="../../../../../org/apache/beam/sdk/values/TypeDescriptor.html" title="class in org.apache.beam.sdk.values">TypeDescriptor</a>&lt;FailureT&gt;&nbsp;failureTypeDescriptor)</code>
<div class="block">Returns a new <code>SimpleMapWithFailures</code> transform that catches exceptions raised while
mapping elements, with the given type descriptor used for the failure collection but the
exception handler yet to be specified using <code>SimpleMapWithFailures.exceptionsVia(ProcessFunction)</code>.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>&lt;FailureT&gt;&nbsp;org.apache.beam.sdk.transforms.SimpleMapWithFailures&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V1</a>&gt;,<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V2</a>&gt;,FailureT&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html#exceptionsVia-org.apache.beam.sdk.transforms.InferableFunction-">exceptionsVia</a></span>(<a href="../../../../../org/apache/beam/sdk/transforms/InferableFunction.html" title="class in org.apache.beam.sdk.transforms">InferableFunction</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/WithFailures.ExceptionElement.html" title="class in org.apache.beam.sdk.transforms">WithFailures.ExceptionElement</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V1</a>&gt;&gt;,FailureT&gt;&nbsp;exceptionHandler)</code>
<div class="block">Returns a new <code>SimpleMapWithFailures</code> transform that catches exceptions raised while
mapping elements, passing the raised exception instance and the input element being processed
through the given <code>exceptionHandler</code> and emitting the result to a failure collection.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V2</a>&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html#expand-org.apache.beam.sdk.values.PCollection-">expand</a></span>(<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V1</a>&gt;&gt;&nbsp;input)</code>
<div class="block">Override this method to specify how this <code>PTransform</code> should be expanded on the given
<code>InputT</code>.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static &lt;V2&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="class in org.apache.beam.sdk.transforms">MapValues</a>&lt;?,?,V2&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html#into-org.apache.beam.sdk.values.TypeDescriptor-">into</a></span>(<a href="../../../../../org/apache/beam/sdk/values/TypeDescriptor.html" title="class in org.apache.beam.sdk.values">TypeDescriptor</a>&lt;V2&gt;&nbsp;outputType)</code>
<div class="block">Returns a new <a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="class in org.apache.beam.sdk.transforms"><code>MapValues</code></a> transform with the given type descriptor for the output type,
but the mapping function yet to be specified using <a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html#via-org.apache.beam.sdk.transforms.SerializableFunction-"><code>via(SerializableFunction)</code></a>.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>&lt;NewKeyT,NewValueT&gt;<br><a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="class in org.apache.beam.sdk.transforms">MapValues</a>&lt;NewKeyT,NewValueT,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V2</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html#via-org.apache.beam.sdk.transforms.SerializableFunction-">via</a></span>(<a href="../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms">SerializableFunction</a>&lt;NewValueT,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V2</a>&gt;&nbsp;fn)</code>
<div class="block">Returns a <a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="class in org.apache.beam.sdk.transforms"><code>MapValues</code></a> transform for a <code>ProcessFunction&lt;NewV1, V2&gt;</code> with predefined
<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html#outputType"><code>outputType</code></a>.</div>
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<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#compose-org.apache.beam.sdk.transforms.SerializableFunction-">compose</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#compose-java.lang.String-org.apache.beam.sdk.transforms.SerializableFunction-">compose</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getAdditionalInputs--">getAdditionalInputs</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder--">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder-InputT-">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder-InputT-org.apache.beam.sdk.values.PCollection-">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getKindString--">getKindString</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getName--">getName</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getResourceHints--">getResourceHints</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#setResourceHints-org.apache.beam.sdk.transforms.resourcehints.ResourceHints-">setResourceHints</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#toString--">toString</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#validate-org.apache.beam.sdk.options.PipelineOptions-">validate</a></code></li>
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<h4>via</h4>
<pre>public&nbsp;&lt;NewKeyT,NewValueT&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="class in org.apache.beam.sdk.transforms">MapValues</a>&lt;NewKeyT,NewValueT,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V2</a>&gt;&nbsp;via(<a href="../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms">SerializableFunction</a>&lt;NewValueT,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V2</a>&gt;&nbsp;fn)</pre>
<div class="block">Returns a <a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="class in org.apache.beam.sdk.transforms"><code>MapValues</code></a> transform for a <code>ProcessFunction&lt;NewV1, V2&gt;</code> with predefined
<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html#outputType"><code>outputType</code></a>.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>NewKeyT</code> - the type of the keys in the input and output <code>PCollection</code>s</dd>
<dd><code>NewValueT</code> - the type of the values in the input <code>PCollection</code></dd>
</dl>
</li>
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<pre>public static&nbsp;&lt;V2&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="class in org.apache.beam.sdk.transforms">MapValues</a>&lt;?,?,V2&gt;&nbsp;into(<a href="../../../../../org/apache/beam/sdk/values/TypeDescriptor.html" title="class in org.apache.beam.sdk.values">TypeDescriptor</a>&lt;V2&gt;&nbsp;outputType)</pre>
<div class="block">Returns a new <a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="class in org.apache.beam.sdk.transforms"><code>MapValues</code></a> transform with the given type descriptor for the output type,
but the mapping function yet to be specified using <a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html#via-org.apache.beam.sdk.transforms.SerializableFunction-"><code>via(SerializableFunction)</code></a>.</div>
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<pre><a href="https://static.javadoc.io/org.checkerframework/checker-qual/3.10.0/org/checkerframework/checker/nullness/qual/RequiresNonNull.html?is-external=true" title="class or interface in org.checkerframework.checker.nullness.qual">@RequiresNonNull</a>(<a href="https://static.javadoc.io/org.checkerframework/checker-qual/3.10.0/org/checkerframework/checker/nullness/qual/RequiresNonNull.html?is-external=true#value--" title="class or interface in org.checkerframework.checker.nullness.qual">value</a>="fn")
public&nbsp;&lt;FailureT&gt;&nbsp;org.apache.beam.sdk.transforms.SimpleMapWithFailures&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V1</a>&gt;,<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V2</a>&gt;,FailureT&gt;&nbsp;exceptionsInto(<a href="../../../../../org/apache/beam/sdk/values/TypeDescriptor.html" title="class in org.apache.beam.sdk.values">TypeDescriptor</a>&lt;FailureT&gt;&nbsp;failureTypeDescriptor)</pre>
<div class="block">Returns a new <code>SimpleMapWithFailures</code> transform that catches exceptions raised while
mapping elements, with the given type descriptor used for the failure collection but the
exception handler yet to be specified using <code>SimpleMapWithFailures.exceptionsVia(ProcessFunction)</code>.
<p>See <a href="../../../../../org/apache/beam/sdk/transforms/WithFailures.html" title="class in org.apache.beam.sdk.transforms"><code>WithFailures</code></a> documentation for usage patterns of the returned <a href="../../../../../org/apache/beam/sdk/transforms/WithFailures.Result.html" title="class in org.apache.beam.sdk.transforms"><code>WithFailures.Result</code></a>.
<p>Example usage:
<pre><code>
Result&lt;PCollection&lt;KV&lt;String, Integer&gt;&gt;, String&gt; result =
input.apply(
MapValues.into(TypeDescriptors.integers())
.&lt;String, String&gt;via(word -&gt; 1 / word.length) // Could throw ArithmeticException
.exceptionsInto(TypeDescriptors.strings())
.exceptionsVia(ee -&gt; ee.exception().getMessage()));
PCollection&lt;KV&lt;String, Integer&gt;&gt; output = result.output();
PCollection&lt;String&gt; failures = result.failures();
</code></pre></div>
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<pre><a href="https://static.javadoc.io/org.checkerframework/checker-qual/3.10.0/org/checkerframework/checker/nullness/qual/RequiresNonNull.html?is-external=true" title="class or interface in org.checkerframework.checker.nullness.qual">@RequiresNonNull</a>(<a href="https://static.javadoc.io/org.checkerframework/checker-qual/3.10.0/org/checkerframework/checker/nullness/qual/RequiresNonNull.html?is-external=true#value--" title="class or interface in org.checkerframework.checker.nullness.qual">value</a>="fn")
public&nbsp;&lt;FailureT&gt;&nbsp;org.apache.beam.sdk.transforms.SimpleMapWithFailures&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V1</a>&gt;,<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V2</a>&gt;,FailureT&gt;&nbsp;exceptionsVia(<a href="../../../../../org/apache/beam/sdk/transforms/InferableFunction.html" title="class in org.apache.beam.sdk.transforms">InferableFunction</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/WithFailures.ExceptionElement.html" title="class in org.apache.beam.sdk.transforms">WithFailures.ExceptionElement</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V1</a>&gt;&gt;,FailureT&gt;&nbsp;exceptionHandler)</pre>
<div class="block">Returns a new <code>SimpleMapWithFailures</code> transform that catches exceptions raised while
mapping elements, passing the raised exception instance and the input element being processed
through the given <code>exceptionHandler</code> and emitting the result to a failure collection.
<p>This method takes advantage of the type information provided by <a href="../../../../../org/apache/beam/sdk/transforms/InferableFunction.html" title="class in org.apache.beam.sdk.transforms"><code>InferableFunction</code></a>,
meaning that a call to <a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html#exceptionsInto-org.apache.beam.sdk.values.TypeDescriptor-"><code>exceptionsInto(TypeDescriptor)</code></a> may not be necessary.
<p>See <a href="../../../../../org/apache/beam/sdk/transforms/WithFailures.html" title="class in org.apache.beam.sdk.transforms"><code>WithFailures</code></a> documentation for usage patterns of the returned <a href="../../../../../org/apache/beam/sdk/transforms/WithFailures.Result.html" title="class in org.apache.beam.sdk.transforms"><code>WithFailures.Result</code></a>.
<p>Example usage:
<pre>{@code
Result<PCollection<KV<String, Integer>>, String> result =
input.apply(
MapValues.into(TypeDescriptors.integers())
.<String, String>via(word -> 1 / word.length) // Could throw ArithmeticException
.exceptionsVia(
new InferableFunction<ExceptionElement<KV<String, String>>, String>() {</div>
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<h4>expand</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V2</a>&gt;&gt;&nbsp;expand(<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V1</a>&gt;&gt;&nbsp;input)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#expand-InputT-">PTransform</a></code></span></div>
<div class="block">Override this method to specify how this <code>PTransform</code> should be expanded on the given
<code>InputT</code>.
<p>NOTE: This method should not be called directly. Instead apply the <code>PTransform</code> should
be applied to the <code>InputT</code> using the <code>apply</code> method.
<p>Composite transforms, which are defined in terms of other transforms, should return the
output of one of the composed transforms. Non-composite transforms, which do not apply any
transforms internally, should return a new unbound output and register evaluators (via
backend-specific registration methods).</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#expand-InputT-">expand</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V1</a>&gt;&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/MapValues.html" title="type parameter in MapValues">V2</a>&gt;&gt;&gt;</code></dd>
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