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| <div class="subTitle">org.apache.drill.exec.physical.impl.xsort</div> |
| <h2 title="Class MergeSortWrapper" class="title">Class MergeSortWrapper</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/BaseWrapper.html" title="class in org.apache.drill.exec.physical.impl.xsort">org.apache.drill.exec.physical.impl.xsort.BaseWrapper</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/BaseSortWrapper.html" title="class in org.apache.drill.exec.physical.impl.xsort">org.apache.drill.exec.physical.impl.xsort.BaseSortWrapper</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.drill.exec.physical.impl.xsort.MergeSortWrapper</li> |
| </ul> |
| </li> |
| </ul> |
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| <div class="description"> |
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| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html" title="interface in org.apache.drill.exec.physical.impl.xsort">SortImpl.SortResults</a></dd> |
| </dl> |
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| <br> |
| <pre>public class <span class="typeNameLabel">MergeSortWrapper</span> |
| extends <a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/BaseSortWrapper.html" title="class in org.apache.drill.exec.physical.impl.xsort">BaseSortWrapper</a> |
| implements <a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html" title="interface in org.apache.drill.exec.physical.impl.xsort">SortImpl.SortResults</a></pre> |
| <div class="block">Wrapper around the "MSorter" (in memory merge sorter). As batches have |
| arrived to the sort, they have been individually sorted and buffered |
| in memory. At the completion of the sort, we detect that no batches |
| were spilled to disk. In this case, we can merge the in-memory batches |
| using an efficient memory-based approach implemented here. |
| <p> |
| Since all batches are in memory, we don't want to use the usual merge |
| algorithm as that makes a copy of the original batches (which were read |
| from a spill file) to produce an output batch. Instead, we want to use |
| the in-memory batches as-is. To do this, we use a selection vector 4 |
| (SV4) as a global index into the collection of batches. The SV4 uses |
| the upper two bytes as the batch index, and the lower two as an offset |
| of a record within the batch. |
| <p> |
| The merger ("M Sorter") populates the SV4 by scanning the set of |
| in-memory batches, searching for the one with the lowest value of the |
| sort key. The batch number and offset are placed into the SV4. The process |
| continues until all records from all batches have an entry in the SV4. |
| <p> |
| The actual implementation uses an iterative merge to perform the above |
| efficiently. |
| <p> |
| A sort can only do a single merge. So, we do not attempt to share the |
| generated class; we just generate it internally and discard it at |
| completion of the merge. |
| <p> |
| The merge sorter only makes sense when we have at least one row. The |
| caller must handle the special case of no rows.</div> |
| </li> |
| </ul> |
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| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/MergeSortWrapper.State.html" title="enum in org.apache.drill.exec.physical.impl.xsort">MergeSortWrapper.State</a></span></code> </td> |
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| <h3>Fields inherited from class org.apache.drill.exec.physical.impl.xsort.<a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/BaseSortWrapper.html" title="class in org.apache.drill.exec.physical.impl.xsort">BaseSortWrapper</a></h3> |
| <code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/BaseSortWrapper.html#LEFT_MAPPING">LEFT_MAPPING</a>, <a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/BaseSortWrapper.html#MAIN_MAPPING">MAIN_MAPPING</a>, <a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/BaseSortWrapper.html#RIGHT_MAPPING">RIGHT_MAPPING</a></code></li> |
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| <code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/BaseWrapper.html#context">context</a></code></li> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/MergeSortWrapper.html#MergeSortWrapper-org.apache.drill.exec.ops.OperatorContext-org.apache.drill.exec.record.VectorContainer-">MergeSortWrapper</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/record/VectorContainer.html" title="class in org.apache.drill.exec.record">VectorContainer</a> destContainer)</code> </td> |
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| <tr> |
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| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/MergeSortWrapper.html#close--">close</a></span>()</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/MergeSortWrapper.html#getBatchCount--">getBatchCount</a></span>()</code> </td> |
| </tr> |
| <tr id="i2" 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/xsort/MergeSortWrapper.html#getContainer--">getContainer</a></span>()</code> |
| <div class="block">Container into which results are delivered.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/MergeSortWrapper.html#getRecordCount--">getRecordCount</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/record/selection/SelectionVector2.html" title="class in org.apache.drill.exec.record.selection">SelectionVector2</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/MergeSortWrapper.html#getSv2--">getSv2</a></span>()</code> </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/xsort/MergeSortWrapper.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/xsort/MergeSortWrapper.html#merge-java.util.List-int-">merge</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/InputBatch.html" title="class in org.apache.drill.exec.physical.impl.xsort">InputBatch</a>> batchGroups, |
| int outputBatchSize)</code> |
| <div class="block">Merge the set of in-memory batches to produce a single logical output in the given |
| destination container, indexed by an SV4.</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/xsort/MergeSortWrapper.html#next--">next</a></span>()</code> |
| <div class="block">The SV4 provides a built-in iterator that returns a virtual set of record |
| batches so that the downstream operator need not consume the entire set |
| of accumulated batches in a single step.</div> |
| </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/xsort/MergeSortWrapper.html#updateOutputContainer-org.apache.drill.exec.record.VectorContainer-org.apache.drill.exec.record.selection.SelectionVector4-org.apache.drill.exec.record.RecordBatch.IterOutcome-org.apache.drill.exec.record.BatchSchema-">updateOutputContainer</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> sv4, |
| <a href="../../../../../../../org/apache/drill/exec/record/RecordBatch.IterOutcome.html" title="enum in org.apache.drill.exec.record">RecordBatch.IterOutcome</a> outcome, |
| <a href="../../../../../../../org/apache/drill/exec/record/BatchSchema.html" title="class in org.apache.drill.exec.record">BatchSchema</a> schema)</code> </td> |
| </tr> |
| </table> |
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| <h3>Methods inherited from class org.apache.drill.exec.physical.impl.xsort.<a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/BaseSortWrapper.html" title="class in org.apache.drill.exec.physical.impl.xsort">BaseSortWrapper</a></h3> |
| <code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/BaseSortWrapper.html#generateComparisons-org.apache.drill.exec.expr.ClassGenerator-org.apache.drill.exec.record.VectorAccessible-org.slf4j.Logger-">generateComparisons</a></code></li> |
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| <h3>Methods inherited from class org.apache.drill.exec.physical.impl.xsort.<a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/BaseWrapper.html" title="class in org.apache.drill.exec.physical.impl.xsort">BaseWrapper</a></h3> |
| <code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/BaseWrapper.html#getInstance-org.apache.drill.exec.expr.CodeGenerator-org.slf4j.Logger-">getInstance</a></code></li> |
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| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="MergeSortWrapper-org.apache.drill.exec.ops.OperatorContext-org.apache.drill.exec.record.VectorContainer-"> |
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| </a> |
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| <h4>MergeSortWrapper</h4> |
| <pre>public MergeSortWrapper(<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/record/VectorContainer.html" title="class in org.apache.drill.exec.record">VectorContainer</a> destContainer)</pre> |
| </li> |
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| <h3>Method Detail</h3> |
| <a name="merge-java.util.List-int-"> |
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| <h4>merge</h4> |
| <pre>public void merge(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/InputBatch.html" title="class in org.apache.drill.exec.physical.impl.xsort">InputBatch</a>> batchGroups, |
| int outputBatchSize)</pre> |
| <div class="block">Merge the set of in-memory batches to produce a single logical output in the given |
| destination container, indexed by an SV4.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>batchGroups</code> - the complete set of in-memory batches</dd> |
| <dd><code>outputBatchSize</code> - output batch size for in-memory merge</dd> |
| </dl> |
| </li> |
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| <a name="next--"> |
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| <h4>next</h4> |
| <pre>public boolean next()</pre> |
| <div class="block">The SV4 provides a built-in iterator that returns a virtual set of record |
| batches so that the downstream operator need not consume the entire set |
| of accumulated batches in a single step.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html#next--">next</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html" title="interface in org.apache.drill.exec.physical.impl.xsort">SortImpl.SortResults</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="close--"> |
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| </a> |
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| <h4>close</h4> |
| <pre>public void close()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html#close--">close</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html" title="interface in org.apache.drill.exec.physical.impl.xsort">SortImpl.SortResults</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getBatchCount--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getBatchCount</h4> |
| <pre>public int getBatchCount()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html#getBatchCount--">getBatchCount</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html" title="interface in org.apache.drill.exec.physical.impl.xsort">SortImpl.SortResults</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getRecordCount--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getRecordCount</h4> |
| <pre>public int getRecordCount()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html#getRecordCount--">getRecordCount</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html" title="interface in org.apache.drill.exec.physical.impl.xsort">SortImpl.SortResults</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getSv4--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getSv4</h4> |
| <pre>public <a href="../../../../../../../org/apache/drill/exec/record/selection/SelectionVector4.html" title="class in org.apache.drill.exec.record.selection">SelectionVector4</a> getSv4()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html#getSv4--">getSv4</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html" title="interface in org.apache.drill.exec.physical.impl.xsort">SortImpl.SortResults</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="updateOutputContainer-org.apache.drill.exec.record.VectorContainer-org.apache.drill.exec.record.selection.SelectionVector4-org.apache.drill.exec.record.RecordBatch.IterOutcome-org.apache.drill.exec.record.BatchSchema-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>updateOutputContainer</h4> |
| <pre>public void updateOutputContainer(<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> sv4, |
| <a href="../../../../../../../org/apache/drill/exec/record/RecordBatch.IterOutcome.html" title="enum in org.apache.drill.exec.record">RecordBatch.IterOutcome</a> outcome, |
| <a href="../../../../../../../org/apache/drill/exec/record/BatchSchema.html" title="class in org.apache.drill.exec.record">BatchSchema</a> schema)</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html#updateOutputContainer-org.apache.drill.exec.record.VectorContainer-org.apache.drill.exec.record.selection.SelectionVector4-org.apache.drill.exec.record.RecordBatch.IterOutcome-org.apache.drill.exec.record.BatchSchema-">updateOutputContainer</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html" title="interface in org.apache.drill.exec.physical.impl.xsort">SortImpl.SortResults</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getSv2--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getSv2</h4> |
| <pre>public <a href="../../../../../../../org/apache/drill/exec/record/selection/SelectionVector2.html" title="class in org.apache.drill.exec.record.selection">SelectionVector2</a> getSv2()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html#getSv2--">getSv2</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html" title="interface in org.apache.drill.exec.physical.impl.xsort">SortImpl.SortResults</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getContainer--"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>getContainer</h4> |
| <pre>public <a href="../../../../../../../org/apache/drill/exec/record/VectorContainer.html" title="class in org.apache.drill.exec.record">VectorContainer</a> getContainer()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html#getContainer--">SortImpl.SortResults</a></code></span></div> |
| <div class="block">Container into which results are delivered. May the |
| the original operator container, or may be a different |
| one. This is the container that should be sent |
| downstream. This is a fixed value for all returned |
| results.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html#getContainer--">getContainer</a></code> in interface <code><a href="../../../../../../../org/apache/drill/exec/physical/impl/xsort/SortImpl.SortResults.html" title="interface in org.apache.drill.exec.physical.impl.xsort">SortImpl.SortResults</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| </div> |
| <!-- ========= END OF CLASS DATA ========= --> |
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| <ul class="subNavList"> |
| <li>Summary: </li> |
| <li><a href="#nested.class.summary">Nested</a> | </li> |
| <li><a href="#fields.inherited.from.class.org.apache.drill.exec.physical.impl.xsort.BaseSortWrapper">Field</a> | </li> |
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