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| <div class="subTitle">org.apache.beam.sdk.schemas.transforms</div> |
| <h2 title="Class Unnest" class="title">Class Unnest</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <li>org.apache.beam.sdk.schemas.transforms.Unnest</li> |
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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">Unnest</span> |
| extends java.lang.Object</pre> |
| <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> to unnest nested rows. |
| |
| <p>For example, consider a Row with the following nestedschema: |
| |
| <p>UserEvent Schema: userid: INT64 timestamp: DATETIME location: LatLong |
| |
| <p>LatLong Schema: latitude: DOUBLE longitude: DOUBLE |
| |
| <p>After unnesting, all of the rows will be converted to rows satisfying the following schema: |
| |
| <p>UserEvent Schema: userid: INT64 timestamp: DATETIME location.latitude: DOUBLE |
| location.longitude: DOUBLE |
| |
| <p>By default nested names are concatenated to generated the unnested name, however <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Unnest.Inner.html#withFieldNameFunction-org.apache.beam.sdk.transforms.SerializableFunction-"><code>Unnest.Inner.withFieldNameFunction(org.apache.beam.sdk.transforms.SerializableFunction<java.util.List<java.lang.String>, java.lang.String>)</code></a> can be used to specify a custom naming policy. |
| |
| <p>Note that currently array and map values are not unnested.</div> |
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| <h3>Nested Class Summary</h3> |
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| <caption><span>Nested Classes</span><span class="tabEnd"> </span></caption> |
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| <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/Unnest.Inner.html" title="class in org.apache.beam.sdk.schemas.transforms">Unnest.Inner</a><<a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Unnest.Inner.html" title="type parameter in Unnest.Inner">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 unnests nested row.</div> |
| </td> |
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| <h3>Field Summary</h3> |
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| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms">SerializableFunction</a><java.util.List<java.lang.String>,java.lang.String></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Unnest.html#CONCAT_FIELD_NAMES">CONCAT_FIELD_NAMES</a></span></code> |
| <div class="block">This is the default naming policy for naming fields.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms">SerializableFunction</a><java.util.List<java.lang.String>,java.lang.String></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Unnest.html#KEEP_NESTED_NAME">KEEP_NESTED_NAME</a></span></code> |
| <div class="block">This policy keeps the raw nested field name.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
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| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Unnest.html#Unnest--">Unnest</a></span>()</code> </td> |
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| <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> <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Unnest.Inner.html" title="class in org.apache.beam.sdk.schemas.transforms">Unnest.Inner</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Unnest.html#create--">create</a></span>()</code> </td> |
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| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
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| <h4>CONCAT_FIELD_NAMES</h4> |
| <pre>public static final <a href="../../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms">SerializableFunction</a><java.util.List<java.lang.String>,java.lang.String> CONCAT_FIELD_NAMES</pre> |
| <div class="block">This is the default naming policy for naming fields. Every field name in the path to a given |
| field is concated with _ characters.</div> |
| </li> |
| </ul> |
| <a name="KEEP_NESTED_NAME"> |
| <!-- --> |
| </a> |
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| <h4>KEEP_NESTED_NAME</h4> |
| <pre>public static final <a href="../../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms">SerializableFunction</a><java.util.List<java.lang.String>,java.lang.String> KEEP_NESTED_NAME</pre> |
| <div class="block">This policy keeps the raw nested field name. If two differently-nested fields have the same |
| name, unnesting will fail with this policy.</div> |
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| <a name="Unnest--"> |
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| <h4>Unnest</h4> |
| <pre>public Unnest()</pre> |
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| <h4>create</h4> |
| <pre>public static <T> <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Unnest.Inner.html" title="class in org.apache.beam.sdk.schemas.transforms">Unnest.Inner</a><T> create()</pre> |
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