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<div class="subTitle">org.apache.beam.sdk.transforms</div>
<h2 title="Class ApproximateQuantiles" class="title">Class ApproximateQuantiles</h2>
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<pre>public class <span class="typeNameLabel">ApproximateQuantiles</span>
extends java.lang.Object</pre>
<div class="block"><code>PTransform</code>s for getting an idea of a <code>PCollection</code>'s data distribution using
approximate <code>N</code>-tiles (e.g. quartiles, percentiles, etc.), either globally or per-key.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="class in org.apache.beam.sdk.transforms">ApproximateQuantiles.ApproximateQuantilesCombineFn</a>&lt;<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&lt;<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.ApproximateQuantilesCombineFn.html" title="type parameter in ApproximateQuantiles.ApproximateQuantilesCombineFn">T</a>&gt; &amp; java.io.Serializable&gt;</span></code>
<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.</div>
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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="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<td class="colFirst"><code>static &lt;T extends java.lang.Comparable&lt;T&gt;&gt;<br><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;T&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;java.util.List&lt;T&gt;&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.html#globally-int-">globally</a></span>(int&nbsp;numQuantiles)</code>
<div class="block">Like <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.html#globally-int-ComparatorT-"><code>globally(int, Comparator)</code></a>, but sorts using the elements' natural ordering.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static &lt;T,ComparatorT extends java.util.Comparator&lt;T&gt; &amp; java.io.Serializable&gt;<br><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;T&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;java.util.List&lt;T&gt;&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.html#globally-int-ComparatorT-">globally</a></span>(int&nbsp;numQuantiles,
ComparatorT&nbsp;compareFn)</code>
<div class="block">Returns a <code>PTransform</code> that takes a <code>PCollection&lt;T&gt;</code> and returns a <code>PCollection&lt;List&lt;T&gt;&gt;</code> whose single value is a <code>List</code> of the approximate <code>N</code>-tiles
of the elements of the input <code>PCollection</code>.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static &lt;K,V extends java.lang.Comparable&lt;V&gt;&gt;<br><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,V&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,java.util.List&lt;V&gt;&gt;&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.html#perKey-int-">perKey</a></span>(int&nbsp;numQuantiles)</code>
<div class="block">Like <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.html#perKey-int-ComparatorT-"><code>perKey(int, Comparator)</code></a>, but sorts values using the their natural ordering.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static &lt;K,V,ComparatorT extends java.util.Comparator&lt;V&gt; &amp; java.io.Serializable&gt;<br><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,V&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,java.util.List&lt;V&gt;&gt;&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.html#perKey-int-ComparatorT-">perKey</a></span>(int&nbsp;numQuantiles,
ComparatorT&nbsp;compareFn)</code>
<div class="block">Returns a <code>PTransform</code> that takes a <code>PCollection&lt;KV&lt;K, V&gt;&gt;</code> and returns a <code>PCollection&lt;KV&lt;K, List&lt;V&gt;&gt;&gt;</code> that contains an output element mapping each distinct key in the
input <code>PCollection</code> to a <code>List</code> of the approximate <code>N</code>-tiles of the values
associated with that key in the input <code>PCollection</code>.</div>
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<h4>globally</h4>
<pre>public static&nbsp;&lt;T,ComparatorT extends java.util.Comparator&lt;T&gt; &amp; java.io.Serializable&gt;&nbsp;<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;T&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;java.util.List&lt;T&gt;&gt;&gt;&nbsp;globally(int&nbsp;numQuantiles,
ComparatorT&nbsp;compareFn)</pre>
<div class="block">Returns a <code>PTransform</code> that takes a <code>PCollection&lt;T&gt;</code> and returns a <code>PCollection&lt;List&lt;T&gt;&gt;</code> whose single value is a <code>List</code> of the approximate <code>N</code>-tiles
of the elements of the input <code>PCollection</code>. This gives an idea of the distribution of the
input elements.
<p>The computed <code>List</code> is of size <code>numQuantiles</code>, and contains the input elements'
minimum value, <code>numQuantiles-2</code> intermediate values, and maximum value, in sorted order,
using the given <code>Comparator</code> to order values. To compute traditional <code>N</code>-tiles, one
should use <code>ApproximateQuantiles.globally(N+1, compareFn)</code>.
<p>If there are fewer input elements than <code>numQuantiles</code>, then the result <code>List</code>
will contain all the input elements, in sorted order.
<p>The argument <code>Comparator</code> must be <code>Serializable</code>.
<p>Example of use:
<pre><code>
PCollection&lt;String&gt; pc = ...;
PCollection&lt;List&lt;String&gt;&gt; quantiles =
pc.apply(ApproximateQuantiles.globally(11, stringCompareFn));
</code></pre></div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - the type of the elements in the input <code>PCollection</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>numQuantiles</code> - the number of elements in the resulting quantile values <code>List</code></dd>
<dd><code>compareFn</code> - the function to use to order the elements</dd>
</dl>
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<h4>globally</h4>
<pre>public static&nbsp;&lt;T extends java.lang.Comparable&lt;T&gt;&gt;&nbsp;<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;T&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;java.util.List&lt;T&gt;&gt;&gt;&nbsp;globally(int&nbsp;numQuantiles)</pre>
<div class="block">Like <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.html#globally-int-ComparatorT-"><code>globally(int, Comparator)</code></a>, but sorts using the elements' natural ordering.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - the type of the elements in the input <code>PCollection</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>numQuantiles</code> - the number of elements in the resulting quantile values <code>List</code></dd>
</dl>
</li>
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<h4>perKey</h4>
<pre>public static&nbsp;&lt;K,V,ComparatorT extends java.util.Comparator&lt;V&gt; &amp; java.io.Serializable&gt;&nbsp;<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,V&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,java.util.List&lt;V&gt;&gt;&gt;&gt;&nbsp;perKey(int&nbsp;numQuantiles,
ComparatorT&nbsp;compareFn)</pre>
<div class="block">Returns a <code>PTransform</code> that takes a <code>PCollection&lt;KV&lt;K, V&gt;&gt;</code> and returns a <code>PCollection&lt;KV&lt;K, List&lt;V&gt;&gt;&gt;</code> that contains an output element mapping each distinct key in the
input <code>PCollection</code> to a <code>List</code> of the approximate <code>N</code>-tiles of the values
associated with that key in the input <code>PCollection</code>. This gives an idea of the
distribution of the input values for each key.
<p>Each of the computed <code>List</code>s is of size <code>numQuantiles</code>, and contains the input
values' minimum value, <code>numQuantiles-2</code> intermediate values, and maximum value, in sorted
order, using the given <code>Comparator</code> to order values. To compute traditional <code>N</code>-tiles, one should use <code>ApproximateQuantiles.perKey(compareFn, N+1)</code>.
<p>If a key has fewer than <code>numQuantiles</code> values associated with it, then that key's
output <code>List</code> will contain all the key's input values, in sorted order.
<p>The argument <code>Comparator</code> must be <code>Serializable</code>.
<p>Example of use:
<pre><code>
PCollection&lt;KV&lt;Integer, String&gt;&gt; pc = ...;
PCollection&lt;KV&lt;Integer, List&lt;String&gt;&gt;&gt; quantilesPerKey =
pc.apply(ApproximateQuantiles.&lt;Integer, String&gt;perKey(stringCompareFn, 11));
</code></pre>
<p>See <a href="../../../../../org/apache/beam/sdk/transforms/Combine.PerKey.html" title="class in org.apache.beam.sdk.transforms"><code>Combine.PerKey</code></a> for how this affects timestamps and windowing.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>K</code> - the type of the keys in the input and output <code>PCollection</code>s</dd>
<dd><code>V</code> - the type of the values in the input <code>PCollection</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>numQuantiles</code> - the number of elements in the resulting quantile values <code>List</code></dd>
<dd><code>compareFn</code> - the function to use to order the elements</dd>
</dl>
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<h4>perKey</h4>
<pre>public static&nbsp;&lt;K,V extends java.lang.Comparable&lt;V&gt;&gt;&nbsp;<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,V&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,java.util.List&lt;V&gt;&gt;&gt;&gt;&nbsp;perKey(int&nbsp;numQuantiles)</pre>
<div class="block">Like <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateQuantiles.html#perKey-int-ComparatorT-"><code>perKey(int, Comparator)</code></a>, but sorts values using the their natural ordering.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>K</code> - the type of the keys in the input and output <code>PCollection</code>s</dd>
<dd><code>V</code> - the type of the values in the input <code>PCollection</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>numQuantiles</code> - the number of elements in the resulting quantile values <code>List</code></dd>
</dl>
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