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| <h2 title="Class Flatten" class="title">Class Flatten</h2> |
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| <pre>public class <span class="typeNameLabel">Flatten</span> |
| extends java.lang.Object</pre> |
| <div class="block"><code>Flatten<T></code> takes multiple <code>PCollection<T></code>s bundled into a <code>PCollectionList<T></code> and returns a single <code>PCollection<T></code> containing all the elements in |
| all the input <code>PCollection</code>s. The name "Flatten" suggests taking a list of lists and |
| flattening them into a single list. |
| |
| <p>Example of use: |
| |
| <pre><code> |
| PCollection<String> pc1 = ...; |
| PCollection<String> pc2 = ...; |
| PCollection<String> pc3 = ...; |
| PCollectionList<String> pcs = PCollectionList.of(pc1).and(pc2).and(pc3); |
| PCollection<String> merged = pcs.apply(Flatten.<String>pCollections()); |
| </code></pre> |
| |
| <p>By default, the <code>Coder</code> of the output <code>PCollection</code> is the same as the <code>Coder</code> of the first <code>PCollection</code> in the input <code>PCollectionList</code> (if the <code>PCollectionList</code> is non-empty).</div> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Flatten.Iterables.html" title="class in org.apache.beam.sdk.transforms">Flatten.Iterables</a><<a href="../../../../../org/apache/beam/sdk/transforms/Flatten.Iterables.html" title="type parameter in Flatten.Iterables">T</a>></span></code> |
| <div class="block"><code>FlattenIterables<T></code> takes a <code>PCollection<Iterable<T>></code> and returns a <code>PCollection<T></code> that contains all the elements from each iterable.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Flatten.PCollections.html" title="class in org.apache.beam.sdk.transforms">Flatten.PCollections</a><<a href="../../../../../org/apache/beam/sdk/transforms/Flatten.PCollections.html" title="type parameter in Flatten.PCollections">T</a>></span></code> |
| <div class="block">A <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that flattens a <a href="../../../../../org/apache/beam/sdk/values/PCollectionList.html" title="class in org.apache.beam.sdk.values"><code>PCollectionList</code></a> into a <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> |
| containing all the elements of all the <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a>s in its input.</div> |
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| <td class="colFirst"><code>static <T> <a href="../../../../../org/apache/beam/sdk/transforms/Flatten.Iterables.html" title="class in org.apache.beam.sdk.transforms">Flatten.Iterables</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Flatten.html#iterables--">iterables</a></span>()</code> |
| <div class="block">Returns a <code>PTransform</code> that takes a <code>PCollection<Iterable<T>></code> and returns a <code>PCollection<T></code> containing all the elements from all the <code>Iterable</code>s.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <T> <a href="../../../../../org/apache/beam/sdk/transforms/Flatten.PCollections.html" title="class in org.apache.beam.sdk.transforms">Flatten.PCollections</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Flatten.html#pCollections--">pCollections</a></span>()</code> |
| <div class="block">Returns a <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that flattens a <a href="../../../../../org/apache/beam/sdk/values/PCollectionList.html" title="class in org.apache.beam.sdk.values"><code>PCollectionList</code></a> into a <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> |
| containing all the elements of all the <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a>s in its input.</div> |
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| <h4>Flatten</h4> |
| <pre>public Flatten()</pre> |
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| <pre>public static <T> <a href="../../../../../org/apache/beam/sdk/transforms/Flatten.PCollections.html" title="class in org.apache.beam.sdk.transforms">Flatten.PCollections</a><T> pCollections()</pre> |
| <div class="block">Returns a <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that flattens a <a href="../../../../../org/apache/beam/sdk/values/PCollectionList.html" title="class in org.apache.beam.sdk.values"><code>PCollectionList</code></a> into a <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> |
| containing all the elements of all the <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a>s in its input. |
| |
| <p>All inputs must have equal <a href="../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFn</code></a>s. The output elements of <code>Flatten<T></code> are |
| in the same windows and have the same timestamps as their corresponding input elements. The |
| output <code>PCollection</code> will have the same <a href="../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFn</code></a> as all of the inputs.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - the type of the elements in the input and output <code>PCollection</code>s.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>iterables</h4> |
| <pre>public static <T> <a href="../../../../../org/apache/beam/sdk/transforms/Flatten.Iterables.html" title="class in org.apache.beam.sdk.transforms">Flatten.Iterables</a><T> iterables()</pre> |
| <div class="block">Returns a <code>PTransform</code> that takes a <code>PCollection<Iterable<T>></code> and returns a <code>PCollection<T></code> containing all the elements from all the <code>Iterable</code>s. |
| |
| <p>Example of use: |
| |
| <pre><code> |
| PCollection<Iterable<Integer>> pcOfIterables = ...; |
| PCollection<Integer> pc = pcOfIterables.apply(Flatten.<Integer>iterables()); |
| </code></pre> |
| |
| <p>By default, the output <code>PCollection</code> encodes its elements using the same <code>Coder</code> |
| that the input uses for the elements in its <code>Iterable</code>.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - the type of the elements of the input <code>Iterable</code> and the output <code>PCollection</code></dd> |
| </dl> |
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