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| <pre><a href="../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a> |
| public interface <span class="typeNameLabel">ProjectionProducer<T></span></pre> |
| <div class="block">A factory for operations that execute a projection on a <a href="../../../../../org/apache/beam/sdk/schemas/Schema.html" title="class in org.apache.beam.sdk.schemas"><code>Schema</code></a>-aware <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a>. |
| |
| <p>Typically this interface will be implemented by a reader <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> or some component thereof that is capable of pushing |
| down a projection to an external source.</div> |
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| <td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/schemas/ProjectionProducer.html" title="type parameter in ProjectionProducer">T</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/schemas/ProjectionProducer.html#actuateProjectionPushdown-java.util.Map-">actuateProjectionPushdown</a></span>(java.util.Map<<a href="../../../../../org/apache/beam/sdk/values/TupleTag.html" title="class in org.apache.beam.sdk.values">TupleTag</a><?>,<a href="../../../../../org/apache/beam/sdk/schemas/FieldAccessDescriptor.html" title="class in org.apache.beam.sdk.schemas">FieldAccessDescriptor</a>> outputFields)</code> |
| <div class="block">Actuate a projection pushdown.</div> |
| </td> |
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| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/schemas/ProjectionProducer.html#supportsProjectionPushdown--">supportsProjectionPushdown</a></span>()</code> |
| <div class="block">Whether <code>this</code> supports projection pushdown.</div> |
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| <h4>supportsProjectionPushdown</h4> |
| <pre>boolean supportsProjectionPushdown()</pre> |
| <div class="block">Whether <code>this</code> supports projection pushdown.</div> |
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| <h4>actuateProjectionPushdown</h4> |
| <pre><a href="../../../../../org/apache/beam/sdk/schemas/ProjectionProducer.html" title="type parameter in ProjectionProducer">T</a> actuateProjectionPushdown(java.util.Map<<a href="../../../../../org/apache/beam/sdk/values/TupleTag.html" title="class in org.apache.beam.sdk.values">TupleTag</a><?>,<a href="../../../../../org/apache/beam/sdk/schemas/FieldAccessDescriptor.html" title="class in org.apache.beam.sdk.schemas">FieldAccessDescriptor</a>> outputFields)</pre> |
| <div class="block">Actuate a projection pushdown.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>outputFields</code> - Map keyed by the <a href="../../../../../org/apache/beam/sdk/values/TupleTag.html" title="class in org.apache.beam.sdk.values"><code>TupleTag</code></a> for each output on which pushdown is |
| requested. The value is the <a href="../../../../../org/apache/beam/sdk/schemas/FieldAccessDescriptor.html" title="class in org.apache.beam.sdk.schemas"><code>FieldAccessDescriptor</code></a> containing the list of fields |
| needed for that output; fields not present in the descriptor should be dropped.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>T</code> that implements the projection pushdown. The return value is assumed to be a |
| drop-in replacement for <code>this</code>; it must have all the same functionality. For this |
| reason, <code>T</code> is usually the same class as <code>this</code>.</dd> |
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