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| <h2 title="Interface PriorityQueue" class="title">Interface PriorityQueue</h2> |
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| <pre>public interface <span class="typeNameLabel">PriorityQueue</span></pre> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../../org/apache/drill/exec/compile/TemplateClassDefinition.html" title="class in org.apache.drill.exec.compile">TemplateClassDefinition</a><<a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html" title="interface in org.apache.drill.exec.physical.impl.TopN">PriorityQueue</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html#TEMPLATE_DEFINITION">TEMPLATE_DEFINITION</a></span></code> </td> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html#add-org.apache.drill.exec.physical.impl.sort.RecordBatchData-">add</a></span>(<a href="../../../../../../../org/apache/drill/exec/physical/impl/sort/RecordBatchData.html" title="class in org.apache.drill.exec.physical.impl.sort">RecordBatchData</a> batch)</code> |
| <div class="block">The elements in the given batch are added to the priority queue.</div> |
| </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/TopN/PriorityQueue.html#cleanup--">cleanup</a></span>()</code> |
| <div class="block">Releases all the memory consumed by the priority queue.</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/TopN/PriorityQueue.html#generate--">generate</a></span>()</code> |
| <div class="block">This method must be called before fetching the final priority queue hyper batch and final Sv4 vector.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/record/selection/SelectionVector4.html" title="class in org.apache.drill.exec.record.selection">SelectionVector4</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html#getFinalSv4--">getFinalSv4</a></span>()</code> |
| <div class="block">Retrieves the selection vector used to select the elements in the priority queue from the hyper batch |
| provided by the <a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html#getHyperBatch--"><code>getHyperBatch()</code></a> method.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/record/VectorContainer.html" title="class in org.apache.drill.exec.record">VectorContainer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html#getHyperBatch--">getHyperBatch</a></span>()</code> |
| <div class="block">Retrieves the final priority queue HyperBatch containing the results.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/record/selection/SelectionVector4.html" title="class in org.apache.drill.exec.record.selection">SelectionVector4</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html#getSv4--">getSv4</a></span>()</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html#init-int-org.apache.drill.exec.memory.BufferAllocator-boolean-">init</a></span>(int limit, |
| <a href="../../../../../../../org/apache/drill/exec/memory/BufferAllocator.html" title="interface in org.apache.drill.exec.memory">BufferAllocator</a> allocator, |
| boolean hasSv2)</code> |
| <div class="block">Initializes the priority queue.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html#isInitialized--">isInitialized</a></span>()</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html#resetQueue-org.apache.drill.exec.record.VectorContainer-org.apache.drill.exec.record.selection.SelectionVector4-">resetQueue</a></span>(<a href="../../../../../../../org/apache/drill/exec/record/VectorContainer.html" title="class in org.apache.drill.exec.record">VectorContainer</a> container, |
| <a href="../../../../../../../org/apache/drill/exec/record/selection/SelectionVector4.html" title="class in org.apache.drill.exec.record.selection">SelectionVector4</a> vector4)</code> |
| <div class="block">Cleanup the old state of queue and recreate a new one with HyperContainer containing vectors in input container |
| and the corresponding indexes (in SV4 format) from input SelectionVector4</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
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| <h4>TEMPLATE_DEFINITION</h4> |
| <pre>static final <a href="../../../../../../../org/apache/drill/exec/compile/TemplateClassDefinition.html" title="class in org.apache.drill.exec.compile">TemplateClassDefinition</a><<a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html" title="interface in org.apache.drill.exec.physical.impl.TopN">PriorityQueue</a>> TEMPLATE_DEFINITION</pre> |
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| <h4>add</h4> |
| <pre>void add(<a href="../../../../../../../org/apache/drill/exec/physical/impl/sort/RecordBatchData.html" title="class in org.apache.drill.exec.physical.impl.sort">RecordBatchData</a> batch) |
| throws <a href="../../../../../../../org/apache/drill/exec/exception/SchemaChangeException.html" title="class in org.apache.drill.exec.exception">SchemaChangeException</a></pre> |
| <div class="block">The elements in the given batch are added to the priority queue. Note that the priority queue |
| only retains the top elements that fit within the size specified by the <a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html#init-int-org.apache.drill.exec.memory.BufferAllocator-boolean-"><code>init(int, BufferAllocator, boolean)</code></a> |
| method.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>batch</code> - The batch containing elements we want to add.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/exception/SchemaChangeException.html" title="class in org.apache.drill.exec.exception">SchemaChangeException</a></code></dd> |
| </dl> |
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| <h4>init</h4> |
| <pre>void init(int limit, |
| <a href="../../../../../../../org/apache/drill/exec/memory/BufferAllocator.html" title="interface in org.apache.drill.exec.memory">BufferAllocator</a> allocator, |
| boolean hasSv2) |
| throws <a href="../../../../../../../org/apache/drill/exec/exception/SchemaChangeException.html" title="class in org.apache.drill.exec.exception">SchemaChangeException</a></pre> |
| <div class="block">Initializes the priority queue. This method must be called before any other methods on the priority |
| queue are called.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>limit</code> - The size of the priority queue.</dd> |
| <dd><code>allocator</code> - The <a href="../../../../../../../org/apache/drill/exec/memory/BufferAllocator.html" title="interface in org.apache.drill.exec.memory"><code>BufferAllocator</code></a> to use when creating the priority queue.</dd> |
| <dd><code>hasSv2</code> - True when incoming batches have 2 byte selection vectors. False otherwise.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/exception/SchemaChangeException.html" title="class in org.apache.drill.exec.exception">SchemaChangeException</a></code></dd> |
| </dl> |
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| <h4>generate</h4> |
| <pre>void generate()</pre> |
| <div class="block">This method must be called before fetching the final priority queue hyper batch and final Sv4 vector.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/exception/SchemaChangeException.html" title="class in org.apache.drill.exec.exception">SchemaChangeException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getHyperBatch--"> |
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| </a> |
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| <h4>getHyperBatch</h4> |
| <pre><a href="../../../../../../../org/apache/drill/exec/record/VectorContainer.html" title="class in org.apache.drill.exec.record">VectorContainer</a> getHyperBatch()</pre> |
| <div class="block">Retrieves the final priority queue HyperBatch containing the results. <b>Note:</b> this should be called |
| after <a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html#generate--"><code>generate()</code></a>.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The final priority queue HyperBatch containing the results.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getSv4--"> |
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| </a> |
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| <h4>getSv4</h4> |
| <pre><a href="../../../../../../../org/apache/drill/exec/record/selection/SelectionVector4.html" title="class in org.apache.drill.exec.record.selection">SelectionVector4</a> getSv4()</pre> |
| </li> |
| </ul> |
| <a name="getFinalSv4--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getFinalSv4</h4> |
| <pre><a href="../../../../../../../org/apache/drill/exec/record/selection/SelectionVector4.html" title="class in org.apache.drill.exec.record.selection">SelectionVector4</a> getFinalSv4()</pre> |
| <div class="block">Retrieves the selection vector used to select the elements in the priority queue from the hyper batch |
| provided by the <a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html#getHyperBatch--"><code>getHyperBatch()</code></a> method. <b>Note:</b> this should be called after <a href="../../../../../../../org/apache/drill/exec/physical/impl/TopN/PriorityQueue.html#generate--"><code>generate()</code></a>.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The selection vector used to select the elements in the priority queue.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="resetQueue-org.apache.drill.exec.record.VectorContainer-org.apache.drill.exec.record.selection.SelectionVector4-"> |
| <!-- --> |
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| <h4>resetQueue</h4> |
| <pre>void resetQueue(<a href="../../../../../../../org/apache/drill/exec/record/VectorContainer.html" title="class in org.apache.drill.exec.record">VectorContainer</a> container, |
| <a href="../../../../../../../org/apache/drill/exec/record/selection/SelectionVector4.html" title="class in org.apache.drill.exec.record.selection">SelectionVector4</a> vector4) |
| throws <a href="../../../../../../../org/apache/drill/exec/exception/SchemaChangeException.html" title="class in org.apache.drill.exec.exception">SchemaChangeException</a></pre> |
| <div class="block">Cleanup the old state of queue and recreate a new one with HyperContainer containing vectors in input container |
| and the corresponding indexes (in SV4 format) from input SelectionVector4</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>container</code> - </dd> |
| <dd><code>vector4</code> - </dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/exception/SchemaChangeException.html" title="class in org.apache.drill.exec.exception">SchemaChangeException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- --> |
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| <h4>cleanup</h4> |
| <pre>void cleanup()</pre> |
| <div class="block">Releases all the memory consumed by the priority queue.</div> |
| </li> |
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| <pre>boolean isInitialized()</pre> |
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