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| <div class="subTitle">org.apache.drill.exec.physical.impl.protocol</div> |
| <h2 title="Class OperatorDriver" class="title">Class OperatorDriver</h2> |
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| <ul class="inheritance"> |
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| <li>org.apache.drill.exec.physical.impl.protocol.OperatorDriver</li> |
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| <pre>public class <span class="typeNameLabel">OperatorDriver</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">State machine that drives the operator executable. Converts |
| between the iterator protocol and the operator executable protocol. |
| Implemented as a separate class in anticipation of eventually |
| changing the record batch (iterator) protocol. |
| |
| <h4>Schema-Only Batch</h4> |
| |
| The scan operator is designed to provide an initial, empty, schema-only |
| batch. At the time that this code was written, it was (mis-?) understood |
| that Drill used a "fast schema" path that provided a schema-only batch |
| as the first batch. However, it turns out that most operators fail when |
| presented with an empty batch: many do not properly set the offset |
| vector for variable-width vectors to an initial 0 position, causing all |
| kinds of issues. |
| <p> |
| To work around this issue, the code defaults to *not* providing the |
| schema batch.</div> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/protocol/OperatorDriver.State.html" title="enum in org.apache.drill.exec.physical.impl.protocol">OperatorDriver.State</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/protocol/OperatorDriver.html#OperatorDriver-org.apache.drill.exec.ops.OperatorContext-org.apache.drill.exec.physical.impl.protocol.OperatorExec-boolean-">OperatorDriver</a></span>(<a href="../../../../../../../org/apache/drill/exec/ops/OperatorContext.html" title="interface in org.apache.drill.exec.ops">OperatorContext</a> opContext, |
| <a href="../../../../../../../org/apache/drill/exec/physical/impl/protocol/OperatorExec.html" title="interface in org.apache.drill.exec.physical.impl.protocol">OperatorExec</a> opExec, |
| boolean enableSchemaBatch)</code> </td> |
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| <td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/physical/impl/protocol/BatchAccessor.html" title="interface in org.apache.drill.exec.physical.impl.protocol">BatchAccessor</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/protocol/OperatorDriver.html#batchAccessor--">batchAccessor</a></span>()</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/protocol/OperatorDriver.html#cancel--">cancel</a></span>()</code> |
| <div class="block">Cancels the operator before reaching EOF.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/protocol/OperatorDriver.html#close--">close</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/record/RecordBatch.IterOutcome.html" title="enum in org.apache.drill.exec.record">RecordBatch.IterOutcome</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/protocol/OperatorDriver.html#next--">next</a></span>()</code> |
| <div class="block">Get the next batch.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/ops/OperatorContext.html" title="interface in org.apache.drill.exec.ops">OperatorContext</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/protocol/OperatorDriver.html#operatorContext--">operatorContext</a></span>()</code> </td> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <!-- --> |
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| <h3>Constructor Detail</h3> |
| <a name="OperatorDriver-org.apache.drill.exec.ops.OperatorContext-org.apache.drill.exec.physical.impl.protocol.OperatorExec-boolean-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
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| <h4>OperatorDriver</h4> |
| <pre>public OperatorDriver(<a href="../../../../../../../org/apache/drill/exec/ops/OperatorContext.html" title="interface in org.apache.drill.exec.ops">OperatorContext</a> opContext, |
| <a href="../../../../../../../org/apache/drill/exec/physical/impl/protocol/OperatorExec.html" title="interface in org.apache.drill.exec.physical.impl.protocol">OperatorExec</a> opExec, |
| boolean enableSchemaBatch)</pre> |
| </li> |
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| <h4>next</h4> |
| <pre>public <a href="../../../../../../../org/apache/drill/exec/record/RecordBatch.IterOutcome.html" title="enum in org.apache.drill.exec.record">RecordBatch.IterOutcome</a> next()</pre> |
| <div class="block">Get the next batch. Performs initialization on the first call.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the iteration outcome to send downstream</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="cancel--"> |
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| <h4>cancel</h4> |
| <pre>public void cancel()</pre> |
| <div class="block">Cancels the operator before reaching EOF.</div> |
| </li> |
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| <a name="close--"> |
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| <h4>close</h4> |
| <pre>public void close()</pre> |
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| <h4>batchAccessor</h4> |
| <pre>public <a href="../../../../../../../org/apache/drill/exec/physical/impl/protocol/BatchAccessor.html" title="interface in org.apache.drill.exec.physical.impl.protocol">BatchAccessor</a> batchAccessor()</pre> |
| </li> |
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| <h4>operatorContext</h4> |
| <pre>public <a href="../../../../../../../org/apache/drill/exec/ops/OperatorContext.html" title="interface in org.apache.drill.exec.ops">OperatorContext</a> operatorContext()</pre> |
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