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| <div class="subTitle">org.apache.drill.exec.physical.impl.scan.v3.lifecycle</div> |
| <h2 title="Class ScanLifecycle" class="title">Class ScanLifecycle</h2> |
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| <li>org.apache.drill.exec.physical.impl.scan.v3.lifecycle.ScanLifecycle</li> |
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| <dd><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/file/FileScanLifecycle.html" title="class in org.apache.drill.exec.physical.impl.scan.v3.file">FileScanLifecycle</a></dd> |
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| <pre>public class <span class="typeNameLabel">ScanLifecycle</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">/** |
| Basic scan framework for a set of "managed" readers and which uses the |
| scan schema tracker to evolve the scan output schema. |
| Readers are created and managed via a reader |
| factory class unique to each type of scan. The reader factory also provides |
| the scan-specific schema negotiator to be passed to the reader. |
| |
| <h4>Lifecycle</h4> |
| |
| The options provided in the <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ScanLifecycleBuilder.html" title="class in org.apache.drill.exec.physical.impl.scan.v3"><code>ScanLifecycleBuilder</code></a> are |
| sufficient to drive the entire scan operator functionality. |
| Schema resolution and projection is done generically and is the same for all |
| data sources. Only the |
| reader (created via the factory class) differs from one type of file to |
| another. |
| <p> |
| The framework achieves the work described below by composing a |
| set of detailed classes, each of which performs some specific task. This |
| structure leaves the reader to simply infer schema and read data. |
| |
| <h4>Reader Integration</h4> |
| |
| The details of how a file is structured, how a schema is inferred, how |
| data is decoded: all that is encapsulated in the reader. The only real |
| Interaction between the reader and the framework is: |
| <ul> |
| <li>The reader factory creates a reader and the corresponding schema |
| negotiator.</li> |
| <li>The reader "negotiates" a schema with the framework. The framework |
| knows the projection list from the query plan, knows something about |
| data types (whether a column should be scalar, a map or an array), and |
| knows about the schema already defined by prior readers. The reader knows |
| what schema it can produce (if "early schema.") The schema negotiator |
| class handles this task.</li> |
| <li>The reader reads data from the file and populates value vectors a |
| batch at a time. The framework creates the result set loader to use for |
| this work. The schema negotiator returns that loader to the reader, which |
| uses it during read.<p> |
| A reader may be "late schema", true "schema on read." In this case, the |
| reader simply tells the result set loader to create a new column reader |
| on the fly. The framework will work out if that new column is to be |
| projected and will return either a real column writer (projected column) |
| or a dummy column writer (unprojected column.)</li> |
| <li>The reader then reads batches of data until all data is read. The |
| result set loader signals when a batch is full; the reader should not |
| worry about this detail itself.</li> |
| <li>The reader then releases its resources.</li> |
| </ul> |
| <p> |
| See <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/schema/ScanSchemaTracker.html" title="interface in org.apache.drill.exec.physical.impl.scan.v3.schema"><code>ScanSchemaTracker</code></a> for details about how the scan schema |
| evolves over the scan lifecycle. |
| |
| <h4>Lifecycle</h4> |
| |
| Coordinates the components that make up a scan implementation: |
| <ul> |
| <li><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/schema/ScanSchemaTracker.html" title="interface in org.apache.drill.exec.physical.impl.scan.v3.schema"><code>ScanSchemaTracker</code></a> which resolves the scan schema over the |
| lifetime of the scan.</li> |
| <li>Implicit columns manager which identifies and populates implicit |
| file columns, partition columns, and Drill's internal metadata |
| columns.</li> |
| <li>The actual readers which load (possibly a subset of) the |
| columns requested from the input source.</li> |
| </ul> |
| <p> |
| Implicit columns are unique to each storage plugin. At present, they |
| are defined only for the file system plugin. To handle such variation, |
| each extension defines a subclass of the <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ScanLifecycleBuilder.html" title="class in org.apache.drill.exec.physical.impl.scan.v3"><code>ScanLifecycleBuilder</code></a> class to |
| create the implicit columns manager (and schema negotiator) unique to |
| a certain kind of scan. |
| <p> |
| Each reader is tracked by a <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ReaderLifecycle.html" title="class in org.apache.drill.exec.physical.impl.scan.v3.lifecycle"><code>ReaderLifecycle</code></a> which handles: |
| <ul> |
| <li>Setting up the <a href="../../../../../../../../../org/apache/drill/exec/physical/resultSet/ResultSetLoader.html" title="interface in org.apache.drill.exec.physical.resultSet"><code>ResultSetLoader</code></a> for the reader.</li> |
| <li>The concrete values for implicit columns for that reader |
| (and its file, if file-based.)</li> |
| <li>The missing columns handler which "makes up" values for projected |
| columns not read by the reader.</li> |
| <li>Batch asssembler, which combines the three sources of vectors |
| to create the output batch with the schema specified by the |
| schema tracker.</li> |
| </ul> |
| |
| <h4>Publishing the Final Result Set<h4> |
| |
| This class "publishes" a vector container that has the final, projected |
| form of a scan. The projected schema include: |
| <ul> |
| <li>Columns from the reader.</li> |
| <li>Static columns, such as implicit or partition columns.</li> |
| <li>Null columns for items in the select list, but not found in either |
| of the above two categories.</li> |
| </ul> |
| The order of columns is that set by the select list (or, by the reader for |
| a <tt>SELECT *</tt> query.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/schema/ScanSchemaTracker.html" title="interface in org.apache.drill.exec.physical.impl.scan.v3.schema"><code>for a description of the schema lifecycle |
| which drives a scan</code></a></dd> |
| </dl> |
| </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/drill/exec/physical/impl/scan/v3/lifecycle/ScanLifecycle.html#ScanLifecycle-org.apache.drill.exec.ops.OperatorContext-org.apache.drill.exec.physical.impl.scan.v3.ScanLifecycleBuilder-">ScanLifecycle</a></span>(<a href="../../../../../../../../../org/apache/drill/exec/ops/OperatorContext.html" title="interface in org.apache.drill.exec.ops">OperatorContext</a> context, |
| <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ScanLifecycleBuilder.html" title="class in org.apache.drill.exec.physical.impl.scan.v3">ScanLifecycleBuilder</a> builder)</code> </td> |
| </tr> |
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| <tr> |
| <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><a href="../../../../../../../../../org/apache/drill/exec/memory/BufferAllocator.html" title="interface in org.apache.drill.exec.memory">BufferAllocator</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ScanLifecycle.html#allocator--">allocator</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/scan/v3/lifecycle/ScanLifecycle.html#batchCount--">batchCount</a></span>()</code> </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/scan/v3/lifecycle/ScanLifecycle.html#close--">close</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <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/scan/v3/lifecycle/ScanLifecycle.html#context--">context</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../../../../org/apache/drill/common/exceptions/CustomErrorContext.html" title="interface in org.apache.drill.common.exceptions">CustomErrorContext</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ScanLifecycle.html#errorContext--">errorContext</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ScanLifecycle.html#hasOutputSchema--">hasOutputSchema</a></span>()</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/SchemaNegotiatorImpl.html" title="class in org.apache.drill.exec.physical.impl.scan.v3.lifecycle">SchemaNegotiatorImpl</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ScanLifecycle.html#newNegotiator-org.apache.drill.exec.physical.impl.scan.v3.lifecycle.ReaderLifecycle-">newNegotiator</a></span>(<a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ReaderLifecycle.html" title="class in org.apache.drill.exec.physical.impl.scan.v3.lifecycle">ReaderLifecycle</a> readerLifecycle)</code> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/RowBatchReader.html" title="interface in org.apache.drill.exec.physical.impl.scan">RowBatchReader</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ScanLifecycle.html#nextReader--">nextReader</a></span>()</code> </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ScanLifecycleBuilder.html" title="class in org.apache.drill.exec.physical.impl.scan.v3">ScanLifecycleBuilder</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ScanLifecycle.html#options--">options</a></span>()</code> </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../../../../org/apache/drill/exec/record/metadata/TupleMetadata.html" title="interface in org.apache.drill.exec.record.metadata">TupleMetadata</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ScanLifecycle.html#outputSchema--">outputSchema</a></span>()</code> </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ReaderFactory.html" title="interface in org.apache.drill.exec.physical.impl.scan.v3">ReaderFactory</a><?></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ScanLifecycle.html#readerFactory--">readerFactory</a></span>()</code> </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ScanLifecycle.html#rowCount--">rowCount</a></span>()</code> </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/schema/ScanSchemaTracker.html" title="interface in org.apache.drill.exec.physical.impl.scan.v3.schema">ScanSchemaTracker</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ScanLifecycle.html#schemaTracker--">schemaTracker</a></span>()</code> </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ScanLifecycle.html#tallyBatch-int-">tallyBatch</a></span>(int rowCount)</code> </td> |
| </tr> |
| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../../../../org/apache/drill/exec/physical/resultSet/impl/ResultVectorCacheImpl.html" title="class in org.apache.drill.exec.physical.resultSet.impl">ResultVectorCacheImpl</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ScanLifecycle.html#vectorCache--">vectorCache</a></span>()</code> </td> |
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| <h3>Methods inherited from class java.lang.<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></h3> |
| <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> |
| </ul> |
| </li> |
| </ul> |
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| </ul> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="ScanLifecycle-org.apache.drill.exec.ops.OperatorContext-org.apache.drill.exec.physical.impl.scan.v3.ScanLifecycleBuilder-"> |
| <!-- --> |
| </a> |
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| <h4>ScanLifecycle</h4> |
| <pre>public ScanLifecycle(<a href="../../../../../../../../../org/apache/drill/exec/ops/OperatorContext.html" title="interface in org.apache.drill.exec.ops">OperatorContext</a> context, |
| <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/ScanLifecycleBuilder.html" title="class in org.apache.drill.exec.physical.impl.scan.v3">ScanLifecycleBuilder</a> builder)</pre> |
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| <h4>context</h4> |
| <pre>public <a href="../../../../../../../../../org/apache/drill/exec/ops/OperatorContext.html" title="interface in org.apache.drill.exec.ops">OperatorContext</a> context()</pre> |
| </li> |
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| <a name="options--"> |
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| <h4>options</h4> |
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| <h4>schemaTracker</h4> |
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| <h4>hasOutputSchema</h4> |
| <pre>public boolean hasOutputSchema()</pre> |
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| <pre>public <a href="../../../../../../../../../org/apache/drill/common/exceptions/CustomErrorContext.html" title="interface in org.apache.drill.common.exceptions">CustomErrorContext</a> errorContext()</pre> |
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| <h4>allocator</h4> |
| <pre>public <a href="../../../../../../../../../org/apache/drill/exec/memory/BufferAllocator.html" title="interface in org.apache.drill.exec.memory">BufferAllocator</a> allocator()</pre> |
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| <h4>batchCount</h4> |
| <pre>public int batchCount()</pre> |
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| <h4>rowCount</h4> |
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| <h4>nextReader</h4> |
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| <h4>newNegotiator</h4> |
| <pre>protected <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/SchemaNegotiatorImpl.html" title="class in org.apache.drill.exec.physical.impl.scan.v3.lifecycle">SchemaNegotiatorImpl</a> newNegotiator(<a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/v3/lifecycle/ReaderLifecycle.html" title="class in org.apache.drill.exec.physical.impl.scan.v3.lifecycle">ReaderLifecycle</a> readerLifecycle)</pre> |
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