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<h2 title="Interface CombineFnBase.GlobalCombineFn" class="title">Interface CombineFnBase.GlobalCombineFn&lt;InputT,AccumT,OutputT&gt;</h2>
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<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>InputT</code> - type of input values</dd>
<dd><code>AccumT</code> - type of mutable accumulator values</dd>
<dd><code>OutputT</code> - type of output values</dd>
</dl>
<dl>
<dt>All Superinterfaces:</dt>
<dd><a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a>, java.io.Serializable</dd>
</dl>
<dl>
<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../../org/apache/beam/sdk/extensions/sketching/ApproximateDistinct.ApproximateDistinctFn.html" title="class in org.apache.beam.sdk.extensions.sketching">ApproximateDistinct.ApproximateDistinctFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="class in org.apache.beam.sdk.transforms">ApproximateQuantiles.ApproximateQuantilesCombineFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.ApproximateUniqueCombineFn.html" title="class in org.apache.beam.sdk.transforms">ApproximateUnique.ApproximateUniqueCombineFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/Combine.AccumulatingCombineFn.html" title="class in org.apache.beam.sdk.transforms">Combine.AccumulatingCombineFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/Combine.BinaryCombineDoubleFn.html" title="class in org.apache.beam.sdk.transforms">Combine.BinaryCombineDoubleFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/Combine.BinaryCombineFn.html" title="class in org.apache.beam.sdk.transforms">Combine.BinaryCombineFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/Combine.BinaryCombineIntegerFn.html" title="class in org.apache.beam.sdk.transforms">Combine.BinaryCombineIntegerFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/Combine.BinaryCombineLongFn.html" title="class in org.apache.beam.sdk.transforms">Combine.BinaryCombineLongFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms">Combine.CombineFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/Combine.IterableCombineFn.html" title="class in org.apache.beam.sdk.transforms">Combine.IterableCombineFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/Combine.SimpleCombineFn.html" title="class in org.apache.beam.sdk.transforms">Combine.SimpleCombineFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/CombineFns.ComposedCombineFn.html" title="class in org.apache.beam.sdk.transforms">CombineFns.ComposedCombineFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/CombineFns.ComposedCombineFnWithContext.html" title="class in org.apache.beam.sdk.transforms">CombineFns.ComposedCombineFnWithContext</a>, <a href="../../../../../org/apache/beam/sdk/transforms/CombineWithContext.CombineFnWithContext.html" title="class in org.apache.beam.sdk.transforms">CombineWithContext.CombineFnWithContext</a>, <a href="../../../../../org/apache/beam/sdk/extensions/sql/impl/transform/agg/CovarianceFn.html" title="class in org.apache.beam.sdk.extensions.sql.impl.transform.agg">CovarianceFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/Sample.FixedSizedSampleFn.html" title="class in org.apache.beam.sdk.transforms">Sample.FixedSizedSampleFn</a>, <a href="../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.CountMinSketchFn.html" title="class in org.apache.beam.sdk.extensions.sketching">SketchFrequencies.CountMinSketchFn</a>, <a href="../../../../../org/apache/beam/sdk/extensions/sketching/TDigestQuantiles.TDigestQuantilesFn.html" title="class in org.apache.beam.sdk.extensions.sketching">TDigestQuantiles.TDigestQuantilesFn</a>, <a href="../../../../../org/apache/beam/sdk/transforms/Top.TopCombineFn.html" title="class in org.apache.beam.sdk.transforms">Top.TopCombineFn</a>, <a href="../../../../../org/apache/beam/sdk/extensions/sql/impl/transform/agg/VarianceFn.html" title="class in org.apache.beam.sdk.extensions.sql.impl.transform.agg">VarianceFn</a></dd>
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<dt>Enclosing class:</dt>
<dd><a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.html" title="class in org.apache.beam.sdk.transforms">CombineFnBase</a></dd>
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<pre><a href="../../../../../org/apache/beam/sdk/annotations/Internal.html" title="annotation in org.apache.beam.sdk.annotations">@Internal</a>
public static interface <span class="typeNameLabel">CombineFnBase.GlobalCombineFn&lt;InputT,AccumT,OutputT&gt;</span>
extends java.io.Serializable, <a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></pre>
<div class="block"><b><i>For internal use only; no backwards-compatibility guarantees.</i></b>
<p>A <code>GloballyCombineFn&lt;InputT, AccumT, OutputT&gt;</code> specifies how to combine a collection
of input values of type <code>InputT</code> into a single output value of type <code>OutputT</code>. It
does this via one or more intermediate mutable accumulator values of type <code>AccumT</code>.
<p>Do not implement this interface directly. Extends <a href="../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms"><code>Combine.CombineFn</code></a> and <a href="../../../../../org/apache/beam/sdk/transforms/CombineWithContext.CombineFnWithContext.html" title="class in org.apache.beam.sdk.transforms"><code>CombineWithContext.CombineFnWithContext</code></a> instead.</div>
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<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><a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="type parameter in CombineFnBase.GlobalCombineFn">OutputT</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html#defaultValue--">defaultValue</a></span>()</code>
<div class="block">Returns the default value when there are no values added to the accumulator.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="type parameter in CombineFnBase.GlobalCombineFn">AccumT</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html#getAccumulatorCoder-org.apache.beam.sdk.coders.CoderRegistry-org.apache.beam.sdk.coders.Coder-">getAccumulatorCoder</a></span>(<a href="../../../../../org/apache/beam/sdk/coders/CoderRegistry.html" title="class in org.apache.beam.sdk.coders">CoderRegistry</a>&nbsp;registry,
<a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="type parameter in CombineFnBase.GlobalCombineFn">InputT</a>&gt;&nbsp;inputCoder)</code>
<div class="block">Returns the <code>Coder</code> to use for accumulator <code>AccumT</code> values, or null if it is not
able to be inferred.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="type parameter in CombineFnBase.GlobalCombineFn">OutputT</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html#getDefaultOutputCoder-org.apache.beam.sdk.coders.CoderRegistry-org.apache.beam.sdk.coders.Coder-">getDefaultOutputCoder</a></span>(<a href="../../../../../org/apache/beam/sdk/coders/CoderRegistry.html" title="class in org.apache.beam.sdk.coders">CoderRegistry</a>&nbsp;registry,
<a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="type parameter in CombineFnBase.GlobalCombineFn">InputT</a>&gt;&nbsp;inputCoder)</code>
<div class="block">Returns the <code>Coder</code> to use by default for output <code>OutputT</code> values, or null if it
is not able to be inferred.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html#getIncompatibleGlobalWindowErrorMessage--">getIncompatibleGlobalWindowErrorMessage</a></span>()</code>
<div class="block">Returns the error message for not supported default values in Combine.globally().</div>
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<h3>Methods inherited from interface&nbsp;org.apache.beam.sdk.transforms.display.<a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></h3>
<code><a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a></code></li>
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<a name="getAccumulatorCoder-org.apache.beam.sdk.coders.CoderRegistry-org.apache.beam.sdk.coders.Coder-">
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<h4>getAccumulatorCoder</h4>
<pre><a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="type parameter in CombineFnBase.GlobalCombineFn">AccumT</a>&gt;&nbsp;getAccumulatorCoder(<a href="../../../../../org/apache/beam/sdk/coders/CoderRegistry.html" title="class in org.apache.beam.sdk.coders">CoderRegistry</a>&nbsp;registry,
<a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="type parameter in CombineFnBase.GlobalCombineFn">InputT</a>&gt;&nbsp;inputCoder)
throws <a href="../../../../../org/apache/beam/sdk/coders/CannotProvideCoderException.html" title="class in org.apache.beam.sdk.coders">CannotProvideCoderException</a></pre>
<div class="block">Returns the <code>Coder</code> to use for accumulator <code>AccumT</code> values, or null if it is not
able to be inferred.
<p>By default, uses the knowledge of the <code>Coder</code> being used for <code>InputT</code> values
and the enclosing <code>Pipeline</code>'s <code>CoderRegistry</code> to try to infer the Coder for
<code>AccumT</code> values.
<p>This is the Coder used to send data through a communication-intensive shuffle step, so a
compact and efficient representation may have significant performance benefits.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/beam/sdk/coders/CannotProvideCoderException.html" title="class in org.apache.beam.sdk.coders">CannotProvideCoderException</a></code></dd>
</dl>
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<h4>getDefaultOutputCoder</h4>
<pre><a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="type parameter in CombineFnBase.GlobalCombineFn">OutputT</a>&gt;&nbsp;getDefaultOutputCoder(<a href="../../../../../org/apache/beam/sdk/coders/CoderRegistry.html" title="class in org.apache.beam.sdk.coders">CoderRegistry</a>&nbsp;registry,
<a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="type parameter in CombineFnBase.GlobalCombineFn">InputT</a>&gt;&nbsp;inputCoder)
throws <a href="../../../../../org/apache/beam/sdk/coders/CannotProvideCoderException.html" title="class in org.apache.beam.sdk.coders">CannotProvideCoderException</a></pre>
<div class="block">Returns the <code>Coder</code> to use by default for output <code>OutputT</code> values, or null if it
is not able to be inferred.
<p>By default, uses the knowledge of the <code>Coder</code> being used for input <code>InputT</code>
values and the enclosing <code>Pipeline</code>'s <code>CoderRegistry</code> to try to infer the Coder
for <code>OutputT</code> values.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/beam/sdk/coders/CannotProvideCoderException.html" title="class in org.apache.beam.sdk.coders">CannotProvideCoderException</a></code></dd>
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<h4>getIncompatibleGlobalWindowErrorMessage</h4>
<pre>java.lang.String&nbsp;getIncompatibleGlobalWindowErrorMessage()</pre>
<div class="block">Returns the error message for not supported default values in Combine.globally().</div>
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<h4>defaultValue</h4>
<pre><a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="type parameter in CombineFnBase.GlobalCombineFn">OutputT</a>&nbsp;defaultValue()</pre>
<div class="block">Returns the default value when there are no values added to the accumulator.</div>
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