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| <div class="subTitle">org.apache.beam.sdk.schemas.transforms</div> |
| <h2 title="Class Group" class="title">Class Group</h2> |
| </div> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <ul class="inheritance"> |
| <li>org.apache.beam.sdk.schemas.transforms.Group</li> |
| </ul> |
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| <pre><a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a>(<a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html#value--">value</a>=<a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.Kind.html#SCHEMAS">SCHEMAS</a>) |
| public class <span class="typeNameLabel">Group</span> |
| extends java.lang.Object</pre> |
| <div class="block">A generic grouping transform for schema <a href="../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a>s. |
| |
| <p>When used without a combiner, this transforms simply acts as a <a href="../../../../../../org/apache/beam/sdk/transforms/GroupByKey.html" title="class in org.apache.beam.sdk.transforms"><code>GroupByKey</code></a> but without |
| the need for the user to explicitly extract the keys. For example, consider the following input |
| type: |
| |
| <pre><code> |
| {@literal @DefaultSchema(JavaFieldSchema.class)} |
| public class UserPurchase { |
| public String userId; |
| public String country; |
| public long cost; |
| public double transactionDuration; |
| } |
| |
| {@literal PCollection<UserPurchase>} purchases = readUserPurchases(); |
| </code></pre> |
| |
| <p>You can group all purchases by user and country as follows: |
| |
| <pre><code> |
| {@literal @DefaultSchema}(JavaFieldSchema.class) |
| {@literal PCollection<KV<Row, Iterable<UserPurchase>>} byUser = |
| purchases.apply(Group.byFieldNames("userId', "country")); |
| </code></pre> |
| |
| <p>However often an aggregation of some form is desired. The builder methods inside the Group |
| class allows building up separate aggregations for every field (or set of fields) on the input |
| schema, and generating an output schema based on these aggregations. For example: |
| |
| <pre><code> |
| PCollection<KV<Row, Row>> aggregated = purchases |
| .apply(Group.byFieldNames("userId', "country") |
| .aggregateField("cost", Sum.ofLongs(), "total_cost") |
| .aggregateField("cost", Top.<Long>largestLongsFn(10), "top_purchases") |
| .aggregateField("cost", ApproximateQuantilesCombineFn.create(21), |
| Field.of("transactionDurations", FieldType.array(FieldType.INT64))); |
| </code></pre> |
| |
| <p>The result will be a new row schema containing the fields total_cost, top_purchases, and |
| transactionDurations, containing the sum of all purchases costs (for that user and country), the |
| top ten purchases, and a histogram of transaction durations. |
| |
| <p>Note that usually the field type can be automatically inferred from the <a href="../../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms"><code>Combine.CombineFn</code></a> |
| passed in. However sometimes it cannot be inferred, due to Java type erasure, in which case a |
| <a href="../../../../../../org/apache/beam/sdk/schemas/Schema.Field.html" title="class in org.apache.beam.sdk.schemas"><code>Schema.Field</code></a> object containing the field type must be passed in. This is currently the case for |
| ApproximateQuantilesCombineFn in the above example.</div> |
| </li> |
| </ul> |
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| <!-- ======== NESTED CLASS SUMMARY ======== --> |
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| <h3>Nested Class Summary</h3> |
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| <caption><span>Nested Classes</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.ByFields.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.ByFields</a><<a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.ByFields.html" title="type parameter in Group.ByFields">InputT</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 groups schema elements based on the given fields.</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/schemas/transforms/Group.CombineByFields.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.CombineByFields</a><<a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.CombineByFields.html" title="type parameter in Group.CombineByFields">InputT</a>,<a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.CombineByFields.html" title="type parameter in Group.CombineByFields">OutputT</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 does a per0-key combine using a specified <a href="../../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms"><code>Combine.CombineFn</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.CombineFieldsByFields.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.CombineFieldsByFields</a><<a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.CombineFieldsByFields.html" title="type parameter in Group.CombineFieldsByFields">InputT</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 does a per-key combine using an aggregation built up by calls to |
| aggregateField and aggregateFields.</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/schemas/transforms/Group.CombineFieldsGlobally.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.CombineFieldsGlobally</a><<a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.CombineFieldsGlobally.html" title="type parameter in Group.CombineFieldsGlobally">InputT</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 does a global combine using an aggregation built up by calls to |
| aggregateField and aggregateFields.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.CombineGlobally.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.CombineGlobally</a><<a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.CombineGlobally.html" title="type parameter in Group.CombineGlobally">InputT</a>,<a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.CombineGlobally.html" title="type parameter in Group.CombineGlobally">OutputT</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 does a global combine using a provider <a href="../../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms"><code>Combine.CombineFn</code></a>.</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/schemas/transforms/Group.Global.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.Global</a><<a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.Global.html" title="type parameter in Group.Global">InputT</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> for doing global aggregations on schema PCollections.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.html#Group--">Group</a></span>()</code> </td> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <T> <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.ByFields.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.ByFields</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.html#byFieldAccessDescriptor-org.apache.beam.sdk.schemas.FieldAccessDescriptor-">byFieldAccessDescriptor</a></span>(<a href="../../../../../../org/apache/beam/sdk/schemas/FieldAccessDescriptor.html" title="class in org.apache.beam.sdk.schemas">FieldAccessDescriptor</a> fieldAccess)</code> |
| <div class="block">Returns a transform that groups all elements in the input <a href="../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> keyed by the |
| fields specified.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <T> <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.ByFields.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.ByFields</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.html#byFieldIds-java.lang.Integer...-">byFieldIds</a></span>(java.lang.Integer... fieldIds)</code> |
| <div class="block">Returns a transform that groups all elements in the input <a href="../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> keyed by the list |
| of fields specified.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <T> <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.ByFields.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.ByFields</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.html#byFieldNames-java.lang.String...-">byFieldNames</a></span>(java.lang.String... fieldNames)</code> |
| <div class="block">Returns a transform that groups all elements in the input <a href="../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> keyed by the list |
| of fields specified.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <T> <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.Global.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.Global</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.html#globally--">globally</a></span>()</code> |
| <div class="block">Returns a transform that groups all elements in the input <a href="../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a>.</div> |
| </td> |
| </tr> |
| </table> |
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| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.detail"> |
| <!-- --> |
| </a> |
| <h3>Constructor Detail</h3> |
| <a name="Group--"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>Group</h4> |
| <pre>public Group()</pre> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <a name="globally--"> |
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| </a> |
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| <li class="blockList"> |
| <h4>globally</h4> |
| <pre>public static <T> <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.Global.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.Global</a><T> globally()</pre> |
| <div class="block">Returns a transform that groups all elements in the input <a href="../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a>. The returned |
| transform contains further builder methods to control how the grouping is done.</div> |
| </li> |
| </ul> |
| <a name="byFieldNames-java.lang.String...-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>byFieldNames</h4> |
| <pre>public static <T> <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.ByFields.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.ByFields</a><T> byFieldNames(java.lang.String... fieldNames)</pre> |
| <div class="block">Returns a transform that groups all elements in the input <a href="../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> keyed by the list |
| of fields specified. The output of this transform will be a <a href="../../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values"><code>KV</code></a> keyed by a <a href="../../../../../../org/apache/beam/sdk/values/Row.html" title="class in org.apache.beam.sdk.values"><code>Row</code></a> |
| containing the specified extracted fields. The returned transform contains further builder |
| methods to control how the grouping is done.</div> |
| </li> |
| </ul> |
| <a name="byFieldIds-java.lang.Integer...-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>byFieldIds</h4> |
| <pre>public static <T> <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.ByFields.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.ByFields</a><T> byFieldIds(java.lang.Integer... fieldIds)</pre> |
| <div class="block">Returns a transform that groups all elements in the input <a href="../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> keyed by the list |
| of fields specified. The output of this transform will be a <a href="../../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values"><code>KV</code></a> keyed by a <a href="../../../../../../org/apache/beam/sdk/values/Row.html" title="class in org.apache.beam.sdk.values"><code>Row</code></a> |
| containing the specified extracted fields. The returned transform contains further builder |
| methods to control how the grouping is done.</div> |
| </li> |
| </ul> |
| <a name="byFieldAccessDescriptor-org.apache.beam.sdk.schemas.FieldAccessDescriptor-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
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| <h4>byFieldAccessDescriptor</h4> |
| <pre>public static <T> <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Group.ByFields.html" title="class in org.apache.beam.sdk.schemas.transforms">Group.ByFields</a><T> byFieldAccessDescriptor(<a href="../../../../../../org/apache/beam/sdk/schemas/FieldAccessDescriptor.html" title="class in org.apache.beam.sdk.schemas">FieldAccessDescriptor</a> fieldAccess)</pre> |
| <div class="block">Returns a transform that groups all elements in the input <a href="../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> keyed by the |
| fields specified. The output of this transform will be a <a href="../../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values"><code>KV</code></a> keyed by a <a href="../../../../../../org/apache/beam/sdk/values/Row.html" title="class in org.apache.beam.sdk.values"><code>Row</code></a> |
| containing the specified extracted fields. The returned transform contains further builder |
| methods to control how the grouping is done.</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
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