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| <div class="subTitle">org.apache.beam.sdk.transforms</div> |
| <h2 title="Class ApproximateQuantiles.ApproximateQuantilesCombineFn" class="title">Class ApproximateQuantiles.ApproximateQuantilesCombineFn<T,ComparatorT extends java.util.Comparator<T> & java.io.Serializable></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/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms">org.apache.beam.sdk.transforms.Combine.CombineFn</a><InputT,AccumT,OutputT></li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/beam/sdk/transforms/Combine.AccumulatingCombineFn.html" title="class in org.apache.beam.sdk.transforms">org.apache.beam.sdk.transforms.Combine.AccumulatingCombineFn</a><T,org.apache.beam.sdk.transforms.ApproximateQuantiles.QuantileState<T,ComparatorT>,java.util.List<T>></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.beam.sdk.transforms.ApproximateQuantiles.ApproximateQuantilesCombineFn<T,ComparatorT></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <div class="description"> |
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| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - the type of the values being combined</dd> |
| </dl> |
| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd>java.io.Serializable, <a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="interface in org.apache.beam.sdk.transforms">CombineFnBase.GlobalCombineFn</a><T,org.apache.beam.sdk.transforms.ApproximateQuantiles.QuantileState<T,ComparatorT>,java.util.List<T>>, <a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></dd> |
| </dl> |
| <dl> |
| <dt>Enclosing class:</dt> |
| <dd><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.html" title="class in org.apache.beam.sdk.transforms">ApproximateQuantiles</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public static class <span class="typeNameLabel">ApproximateQuantiles.ApproximateQuantilesCombineFn<T,ComparatorT extends java.util.Comparator<T> & java.io.Serializable></span> |
| extends <a href="../../../../../org/apache/beam/sdk/transforms/Combine.AccumulatingCombineFn.html" title="class in org.apache.beam.sdk.transforms">Combine.AccumulatingCombineFn</a><T,org.apache.beam.sdk.transforms.ApproximateQuantiles.QuantileState<T,ComparatorT>,java.util.List<T>></pre> |
| <div class="block">The <code>ApproximateQuantilesCombineFn</code> combiner gives an idea of the distribution of a |
| collection of values using approximate <code>N</code>-tiles. The output of this combiner is a <code>List</code> of size <code>numQuantiles</code>, containing the input values' minimum value, <code>numQuantiles-2</code> intermediate values, and maximum value, in sorted order, so for traditional |
| <code>N</code>-tiles, one should use <code>ApproximateQuantilesCombineFn#create(N+1)</code>. |
| |
| <p>If there are fewer values to combine than <code>numQuantiles</code>, then the result <code>List</code> |
| will contain all the values being combined, in sorted order. |
| |
| <p>Values are ordered using either a specified <code>Comparator</code> or the values' natural |
| ordering. |
| |
| <p>To evaluate the quantiles we use the "New Algorithm" described here: |
| |
| <pre> |
| [MRL98] Manku, Rajagopalan & Lindsay, "Approximate Medians and other |
| Quantiles in One Pass and with Limited Memory", Proc. 1998 ACM |
| SIGMOD, Vol 27, No 2, p 426-435, June 1998. |
| http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.6.6513&rep=rep1&type=pdf |
| </pre> |
| |
| <p>The default error bound is <code>1 / N</code>, though in practice the accuracy tends to be much |
| better. |
| |
| <p>See <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#create-int-ComparatorT-long-double-"><code>create(int, Comparator, long, double)</code></a> for more information about the meaning of |
| <code>epsilon</code>, and <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#withEpsilon-double-"><code>withEpsilon(double)</code></a> for a convenient way to adjust it.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../serialized-form.html#org.apache.beam.sdk.transforms.ApproximateQuantiles.ApproximateQuantilesCombineFn">Serialized Form</a></dd> |
| </dl> |
| </li> |
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| <!-- --> |
| </a> |
| <h3>Nested classes/interfaces inherited from class org.apache.beam.sdk.transforms.<a href="../../../../../org/apache/beam/sdk/transforms/Combine.AccumulatingCombineFn.html" title="class in org.apache.beam.sdk.transforms">Combine.AccumulatingCombineFn</a></h3> |
| <code><a href="../../../../../org/apache/beam/sdk/transforms/Combine.AccumulatingCombineFn.Accumulator.html" title="interface in org.apache.beam.sdk.transforms">Combine.AccumulatingCombineFn.Accumulator</a><<a href="../../../../../org/apache/beam/sdk/transforms/Combine.AccumulatingCombineFn.Accumulator.html" title="type parameter in Combine.AccumulatingCombineFn.Accumulator">InputT</a>,<a href="../../../../../org/apache/beam/sdk/transforms/Combine.AccumulatingCombineFn.Accumulator.html" title="type parameter in Combine.AccumulatingCombineFn.Accumulator">AccumT</a>,<a href="../../../../../org/apache/beam/sdk/transforms/Combine.AccumulatingCombineFn.Accumulator.html" title="type parameter in Combine.AccumulatingCombineFn.Accumulator">OutputT</a>></code></li> |
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| <!-- =========== FIELD SUMMARY =========== --> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#DEFAULT_MAX_NUM_ELEMENTS">DEFAULT_MAX_NUM_ELEMENTS</a></span></code> |
| <div class="block">The cost (in time and space) to compute quantiles to a given accuracy is a function of the |
| total number of elements in the data set.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== 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"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </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>static <T extends java.lang.Comparable<T>><br><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="class in org.apache.beam.sdk.transforms">ApproximateQuantiles.ApproximateQuantilesCombineFn</a><T,<a href="../../../../../org/apache/beam/sdk/transforms/Top.Natural.html" title="class in org.apache.beam.sdk.transforms">Top.Natural</a><T>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#create-int-">create</a></span>(int numQuantiles)</code> |
| <div class="block">Like <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#create-int-ComparatorT-"><code>create(int, Comparator)</code></a>, but sorts values using their natural ordering.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <T,ComparatorT extends java.util.Comparator<T> & java.io.Serializable><br><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="class in org.apache.beam.sdk.transforms">ApproximateQuantiles.ApproximateQuantilesCombineFn</a><T,ComparatorT></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#create-int-ComparatorT-">create</a></span>(int numQuantiles, |
| ComparatorT compareFn)</code> |
| <div class="block">Returns an approximate quantiles combiner with the given <code>compareFn</code> and desired number |
| of quantiles.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <T,ComparatorT extends java.util.Comparator<T> & java.io.Serializable><br><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="class in org.apache.beam.sdk.transforms">ApproximateQuantiles.ApproximateQuantilesCombineFn</a><T,ComparatorT></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#create-int-ComparatorT-long-double-">create</a></span>(int numQuantiles, |
| ComparatorT compareFn, |
| long maxNumElements, |
| double epsilon)</code> |
| <div class="block">Creates an approximate quantiles combiner with the given <code>compareFn</code> and desired number |
| of quantiles.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>org.apache.beam.sdk.transforms.ApproximateQuantiles.QuantileState<<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>,<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">ComparatorT</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#createAccumulator--">createAccumulator</a></span>()</code> |
| <div class="block">Returns a new, mutable accumulator value, representing the accumulation of zero input values.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>java.lang.reflect.TypeVariable<?></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#getAccumTVariable--">getAccumTVariable</a></span>()</code> |
| <div class="block">Returns the <code>TypeVariable</code> of <code>AccumT</code>.</div> |
| </td> |
| </tr> |
| <tr id="i5" 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><org.apache.beam.sdk.transforms.ApproximateQuantiles.QuantileState<<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>,<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">ComparatorT</a>>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.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> registry, |
| <a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>> elementCoder)</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="i6" 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><OutputT></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.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> registry, |
| <a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><InputT> 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="i7" 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/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#getIncompatibleGlobalWindowErrorMessage--">getIncompatibleGlobalWindowErrorMessage</a></span>()</code> |
| <div class="block">Returns the error message for not supported default values in Combine.globally().</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>java.lang.reflect.TypeVariable<?></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#getInputTVariable--">getInputTVariable</a></span>()</code> |
| <div class="block">Returns the <code>TypeVariable</code> of <code>InputT</code>.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>java.lang.reflect.TypeVariable<?></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#getOutputTVariable--">getOutputTVariable</a></span>()</code> |
| <div class="block">Returns the <code>TypeVariable</code> of <code>OutputT</code>.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a></span>(<a href="../../../../../org/apache/beam/sdk/transforms/display/DisplayData.Builder.html" title="interface in org.apache.beam.sdk.transforms.display">DisplayData.Builder</a> builder)</code> |
| <div class="block">Register display data for the given transform or component.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code><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/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>,<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">ComparatorT</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#withEpsilon-double-">withEpsilon</a></span>(double epsilon)</code> |
| <div class="block">Returns an <code>ApproximateQuantilesCombineFn</code> that's like this one except that it uses the |
| specified <code>epsilon</code> value.</div> |
| </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code><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/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>,<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">ComparatorT</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#withMaxInputSize-long-">withMaxInputSize</a></span>(long maxNumElements)</code> |
| <div class="block">Returns an <code>ApproximateQuantilesCombineFn</code> that's like this one except that it uses the |
| specified <code>maxNumElements</code> value.</div> |
| </td> |
| </tr> |
| </table> |
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| <li class="blockList"><a name="methods.inherited.from.class.org.apache.beam.sdk.transforms.Combine.AccumulatingCombineFn"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class org.apache.beam.sdk.transforms.<a href="../../../../../org/apache/beam/sdk/transforms/Combine.AccumulatingCombineFn.html" title="class in org.apache.beam.sdk.transforms">Combine.AccumulatingCombineFn</a></h3> |
| <code><a href="../../../../../org/apache/beam/sdk/transforms/Combine.AccumulatingCombineFn.html#addInput-AccumT-InputT-">addInput</a>, <a href="../../../../../org/apache/beam/sdk/transforms/Combine.AccumulatingCombineFn.html#extractOutput-AccumT-">extractOutput</a>, <a href="../../../../../org/apache/beam/sdk/transforms/Combine.AccumulatingCombineFn.html#mergeAccumulators-java.lang.Iterable-">mergeAccumulators</a></code></li> |
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| <h4>DEFAULT_MAX_NUM_ELEMENTS</h4> |
| <pre>public static final long DEFAULT_MAX_NUM_ELEMENTS</pre> |
| <div class="block">The cost (in time and space) to compute quantiles to a given accuracy is a function of the |
| total number of elements in the data set. If an estimate is not known or specified, we use |
| this as an upper bound. If this is too low, errors may exceed the requested tolerance; if too |
| high, efficiency may be non-optimal. The impact is logarithmic with respect to this value, so |
| this default should be fine for most uses.</div> |
| <dl> |
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| <dd><a href="../../../../../constant-values.html#org.apache.beam.sdk.transforms.ApproximateQuantiles.ApproximateQuantilesCombineFn.DEFAULT_MAX_NUM_ELEMENTS">Constant Field Values</a></dd> |
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| <pre>public static <T,ComparatorT extends java.util.Comparator<T> & java.io.Serializable> <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="class in org.apache.beam.sdk.transforms">ApproximateQuantiles.ApproximateQuantilesCombineFn</a><T,ComparatorT> create(int numQuantiles, |
| ComparatorT compareFn)</pre> |
| <div class="block">Returns an approximate quantiles combiner with the given <code>compareFn</code> and desired number |
| of quantiles. A total of <code>numQuantiles</code> elements will appear in the output list, |
| including the minimum and maximum. |
| |
| <p>The <code>Comparator</code> must be <code>Serializable</code>. |
| |
| <p>The default error bound is <code>1 / numQuantiles</code>, which holds as long as the number of |
| elements is less than <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#DEFAULT_MAX_NUM_ELEMENTS"><code>DEFAULT_MAX_NUM_ELEMENTS</code></a>.</div> |
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| <pre>public static <T extends java.lang.Comparable<T>> <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="class in org.apache.beam.sdk.transforms">ApproximateQuantiles.ApproximateQuantilesCombineFn</a><T,<a href="../../../../../org/apache/beam/sdk/transforms/Top.Natural.html" title="class in org.apache.beam.sdk.transforms">Top.Natural</a><T>> create(int numQuantiles)</pre> |
| <div class="block">Like <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#create-int-ComparatorT-"><code>create(int, Comparator)</code></a>, but sorts values using their natural ordering.</div> |
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| <h4>withEpsilon</h4> |
| <pre>public <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/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>,<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">ComparatorT</a>> withEpsilon(double epsilon)</pre> |
| <div class="block">Returns an <code>ApproximateQuantilesCombineFn</code> that's like this one except that it uses the |
| specified <code>epsilon</code> value. Does not modify this combiner. |
| |
| <p>See <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#create-int-ComparatorT-long-double-"><code>create(int, Comparator, long, double)</code></a> for more information about the meaning |
| of <code>epsilon</code>.</div> |
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| <pre>public <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/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>,<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">ComparatorT</a>> withMaxInputSize(long maxNumElements)</pre> |
| <div class="block">Returns an <code>ApproximateQuantilesCombineFn</code> that's like this one except that it uses the |
| specified <code>maxNumElements</code> value. Does not modify this combiner. |
| |
| <p>See <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html#create-int-ComparatorT-long-double-"><code>create(int, Comparator, long, double)</code></a> for more information about the meaning |
| of <code>maxNumElements</code>.</div> |
| </li> |
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| <pre>public static <T,ComparatorT extends java.util.Comparator<T> & java.io.Serializable> <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="class in org.apache.beam.sdk.transforms">ApproximateQuantiles.ApproximateQuantilesCombineFn</a><T,ComparatorT> create(int numQuantiles, |
| ComparatorT compareFn, |
| long maxNumElements, |
| double epsilon)</pre> |
| <div class="block">Creates an approximate quantiles combiner with the given <code>compareFn</code> and desired number |
| of quantiles. A total of <code>numQuantiles</code> elements will appear in the output list, |
| including the minimum and maximum. |
| |
| <p>The <code>Comparator</code> must be <code>Serializable</code>. |
| |
| <p>The default error bound is <code>epsilon</code>, which holds as long as the number of elements |
| is less than <code>maxNumElements</code>. Specifically, if one considers the input as a sorted |
| list x_1, ..., x_N, then the distance between the each exact quantile x_c and its |
| approximation x_c' is bounded by <code>|c - c'| < epsilon * N</code>. Note that these errors are |
| worst-case scenarios; in practice the accuracy tends to be much better.</div> |
| </li> |
| </ul> |
| <a name="createAccumulator--"> |
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| <h4>createAccumulator</h4> |
| <pre>public org.apache.beam.sdk.transforms.ApproximateQuantiles.QuantileState<<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>,<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">ComparatorT</a>> createAccumulator()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html#createAccumulator--">Combine.CombineFn</a></code></span></div> |
| <div class="block">Returns a new, mutable accumulator value, representing the accumulation of zero input values.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html#createAccumulator--">createAccumulator</a></code> in class <code><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/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>,org.apache.beam.sdk.transforms.ApproximateQuantiles.QuantileState<<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>,<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">ComparatorT</a> extends java.util.Comparator<<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>> & java.io.Serializable>,java.util.List<<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>>></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getAccumulatorCoder-org.apache.beam.sdk.coders.CoderRegistry-org.apache.beam.sdk.coders.Coder-"> |
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| <h4>getAccumulatorCoder</h4> |
| <pre>public <a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><org.apache.beam.sdk.transforms.ApproximateQuantiles.QuantileState<<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>,<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">ComparatorT</a>>> getAccumulatorCoder(<a href="../../../../../org/apache/beam/sdk/coders/CoderRegistry.html" title="class in org.apache.beam.sdk.coders">CoderRegistry</a> registry, |
| <a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>> elementCoder)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html#getAccumulatorCoder-org.apache.beam.sdk.coders.CoderRegistry-org.apache.beam.sdk.coders.Coder-">CombineFnBase.GlobalCombineFn</a></code></span></div> |
| <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="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><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></code> in interface <code><a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="interface in org.apache.beam.sdk.transforms">CombineFnBase.GlobalCombineFn</a><<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>,org.apache.beam.sdk.transforms.ApproximateQuantiles.QuantileState<<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>,<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">ComparatorT</a> extends java.util.Comparator<<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>> & java.io.Serializable>,java.util.List<<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>>></code></dd> |
| </dl> |
| </li> |
| </ul> |
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| <pre>public void populateDisplayData(<a href="../../../../../org/apache/beam/sdk/transforms/display/DisplayData.Builder.html" title="interface in org.apache.beam.sdk.transforms.display">DisplayData.Builder</a> builder)</pre> |
| <div class="block">Register display data for the given transform or component. |
| |
| <p><code>populateDisplayData(DisplayData.Builder)</code> is invoked by Pipeline runners to collect |
| display data via <a href="../../../../../org/apache/beam/sdk/transforms/display/DisplayData.html#from-org.apache.beam.sdk.transforms.display.HasDisplayData-"><code>DisplayData.from(HasDisplayData)</code></a>. Implementations may call <code>super.populateDisplayData(builder)</code> in order to register display data in the current namespace, |
| but should otherwise use <code>subcomponent.populateDisplayData(builder)</code> to use the namespace |
| of the subcomponent. |
| |
| <p>By default, does not register any display data. Implementors may override this method to |
| provide their own display data.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a></code> in interface <code><a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>builder</code> - The builder to populate with display data.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display"><code>HasDisplayData</code></a></dd> |
| </dl> |
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| </ul> |
| <a name="getDefaultOutputCoder-org.apache.beam.sdk.coders.CoderRegistry-org.apache.beam.sdk.coders.Coder-"> |
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| <h4>getDefaultOutputCoder</h4> |
| <pre>public <a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><OutputT> getDefaultOutputCoder(<a href="../../../../../org/apache/beam/sdk/coders/CoderRegistry.html" title="class in org.apache.beam.sdk.coders">CoderRegistry</a> registry, |
| <a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><InputT> 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"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html#getDefaultOutputCoder-org.apache.beam.sdk.coders.CoderRegistry-org.apache.beam.sdk.coders.Coder-">CombineFnBase.GlobalCombineFn</a></code></span></div> |
| <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="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><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></code> in interface <code><a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="interface in org.apache.beam.sdk.transforms">CombineFnBase.GlobalCombineFn</a><InputT,AccumT,OutputT></code></dd> |
| <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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| <pre>public java.lang.String getIncompatibleGlobalWindowErrorMessage()</pre> |
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| <div class="block">Returns the error message for not supported default values in Combine.globally().</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html#getIncompatibleGlobalWindowErrorMessage--">getIncompatibleGlobalWindowErrorMessage</a></code> in interface <code><a href="../../../../../org/apache/beam/sdk/transforms/CombineFnBase.GlobalCombineFn.html" title="interface in org.apache.beam.sdk.transforms">CombineFnBase.GlobalCombineFn</a><InputT,AccumT,OutputT></code></dd> |
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| <pre>public java.lang.reflect.TypeVariable<?> getAccumTVariable()</pre> |
| <div class="block">Returns the <code>TypeVariable</code> of <code>AccumT</code>.</div> |
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| <pre>public java.lang.reflect.TypeVariable<?> getOutputTVariable()</pre> |
| <div class="block">Returns the <code>TypeVariable</code> of <code>OutputT</code>.</div> |
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| <li>Detail: </li> |
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