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| <div class="subTitle">org.apache.drill.exec.vector.accessor</div> |
| <h2 title="Interface VariantWriter" class="title">Interface VariantWriter</h2> |
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| <dt>All Superinterfaces:</dt> |
| <dd><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ColumnWriter</a></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../../../org/apache/drill/exec/vector/accessor/writer/UnionWriterImpl.html" title="class in org.apache.drill.exec.vector.accessor.writer">UnionWriterImpl</a></dd> |
| </dl> |
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| <br> |
| <pre>public interface <span class="typeNameLabel">VariantWriter</span> |
| extends <a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ColumnWriter</a></pre> |
| <div class="block">Writer for a Drill "union vector." The union vector is presented |
| as a writer over a set of variants. In the old Visual Basic world, |
| "the Variant data type is a tagged union that can be used to |
| represent any other data type." The term is used here to avoid |
| confusion with the "union operator" which is something entirely |
| different. |
| <p> |
| At write time, the set of possible types is expanded upon the |
| first write to each type. A request to obtain a writer for type |
| will create the underlying storage vector if needed, then return |
| a write of the proper type. Note that unlike most other writers, |
| the caller is <i>required</i> to call the |
| <code>#scalar(MinorType)</code> method for each value so that this |
| writer knows which type of value is to be stored. |
| <p> |
| Alternatively, the client can cache a writer by calling |
| <code>#memberWriter(MinorType)</code> to retrieve a writer (without setting |
| the type for a row), then calling the set method on that writer for each |
| row, <b>and</b> calling <code>#setType(MinorType)</code> for each row. |
| <p> |
| This writer acts as somewhat like a map: it allows access to |
| type-specific writers. |
| <p> |
| Although the union and list vectors supports a union of any Drill |
| type, the only sane combinations are: |
| <ul> |
| <li>One of a (single or repeated) (map or list), or</li> |
| <li>One or more scalar type.</li> |
| </ul></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><code>VariantReader}</code></dd> |
| </dl> |
| </li> |
| </ul> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.VariantWriterListener.html" title="interface in org.apache.drill.exec.vector.accessor">VariantWriter.VariantWriterListener</a></span></code> </td> |
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| <h3>Method Summary</h3> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <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/vector/accessor/ObjectWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ObjectWriter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.html#addMember-org.apache.drill.exec.record.metadata.ColumnMetadata-">addMember</a></span>(<a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> schema)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/vector/accessor/ObjectWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ObjectWriter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.html#addMember-org.apache.drill.common.types.TypeProtos.MinorType-">addMember</a></span>(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/vector/accessor/ArrayWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ArrayWriter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.html#array--">array</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.html#hasType-org.apache.drill.common.types.TypeProtos.MinorType-">hasType</a></span>(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</code> |
| <div class="block">Determine if the union vector has materialized storage for the |
| given type.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/vector/accessor/ObjectWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ObjectWriter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.html#member-org.apache.drill.common.types.TypeProtos.MinorType-">member</a></span>(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</code> |
| <div class="block">Set the type of the present value and get the writer for |
| that type.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/vector/accessor/ObjectWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ObjectWriter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.html#memberWriter-org.apache.drill.common.types.TypeProtos.MinorType-">memberWriter</a></span>(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</code> |
| <div class="block">Create or retrieve a writer for the given type.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ScalarWriter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.html#scalar-org.apache.drill.common.types.TypeProtos.MinorType-">scalar</a></span>(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</code> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.html#setType-org.apache.drill.common.types.TypeProtos.MinorType-">setType</a></span>(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</code> |
| <div class="block">Explicitly set the type of the present value.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.html#size--">size</a></span>()</code> |
| <div class="block">Returns the number of types in the variant.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/vector/accessor/TupleWriter.html" title="interface in org.apache.drill.exec.vector.accessor">TupleWriter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.html#tuple--">tuple</a></span>()</code> </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html" title="interface in org.apache.drill.exec.record.metadata">VariantMetadata</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/vector/accessor/VariantWriter.html#variantSchema--">variantSchema</a></span>()</code> |
| <div class="block">Metadata description of the variant that includes the set of |
| types, along with extended properties of the types such as |
| expected allocations sizes, expected array cardinality, etc.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.org.apache.drill.exec.vector.accessor.ColumnWriter"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from interface org.apache.drill.exec.vector.accessor.<a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ColumnWriter</a></h3> |
| <code><a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnWriter.html#copy-org.apache.drill.exec.vector.accessor.ColumnReader-">copy</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnWriter.html#isProjected--">isProjected</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnWriter.html#nullable--">nullable</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnWriter.html#schema--">schema</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnWriter.html#setNull--">setNull</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnWriter.html#setObject-java.lang.Object-">setObject</a>, <a href="../../../../../../org/apache/drill/exec/vector/accessor/ColumnWriter.html#type--">type</a></code></li> |
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| <div class="details"> |
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| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
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| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a name="variantSchema--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>variantSchema</h4> |
| <pre><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html" title="interface in org.apache.drill.exec.record.metadata">VariantMetadata</a> variantSchema()</pre> |
| <div class="block">Metadata description of the variant that includes the set of |
| types, along with extended properties of the types such as |
| expected allocations sizes, expected array cardinality, etc.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>metadata for the variant</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="size--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>size</h4> |
| <pre>int size()</pre> |
| <div class="block">Returns the number of types in the variant. Some implementations |
| (such as lists) impart special meaning to a variant with a single type.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>number of types in the variant</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="hasType-org.apache.drill.common.types.TypeProtos.MinorType-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>hasType</h4> |
| <pre>boolean hasType(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</pre> |
| <div class="block">Determine if the union vector has materialized storage for the |
| given type. (The storage will be created as needed during writing.)</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - data type</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>true</code> if a value of the given type has been written |
| and storage allocated (or storage was allocated implicitly), |
| <code>false</code> otherwise</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="addMember-org.apache.drill.common.types.TypeProtos.MinorType-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>addMember</h4> |
| <pre><a href="../../../../../../org/apache/drill/exec/vector/accessor/ObjectWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ObjectWriter</a> addMember(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</pre> |
| </li> |
| </ul> |
| <a name="addMember-org.apache.drill.exec.record.metadata.ColumnMetadata-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>addMember</h4> |
| <pre><a href="../../../../../../org/apache/drill/exec/vector/accessor/ObjectWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ObjectWriter</a> addMember(<a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> schema)</pre> |
| </li> |
| </ul> |
| <a name="memberWriter-org.apache.drill.common.types.TypeProtos.MinorType-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>memberWriter</h4> |
| <pre><a href="../../../../../../org/apache/drill/exec/vector/accessor/ObjectWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ObjectWriter</a> memberWriter(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</pre> |
| <div class="block">Create or retrieve a writer for the given type. Use this form when |
| caching writers. This form <i>does not</i> set the type of the current |
| row; call <code>#setType(MinorType)</code> per row when the writers are |
| cached. This method can be called at any time as it does not depend |
| on an active batch.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - the type of the writer to cache</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the writer for that type without setting the type of the |
| current row.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="setType-org.apache.drill.common.types.TypeProtos.MinorType-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>setType</h4> |
| <pre>void setType(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</pre> |
| <div class="block">Explicitly set the type of the present value. Use this when |
| the writers are cached. The writer must already exist.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - type to set for the current row</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="member-org.apache.drill.common.types.TypeProtos.MinorType-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>member</h4> |
| <pre><a href="../../../../../../org/apache/drill/exec/vector/accessor/ObjectWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ObjectWriter</a> member(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</pre> |
| <div class="block">Set the type of the present value and get the writer for |
| that type. Available only when a batch is active. Use this form to |
| declare the type of the current row, and retrieve a writer for that |
| value.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - type to set for the current row</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>writer for the type just set</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="scalar-org.apache.drill.common.types.TypeProtos.MinorType-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>scalar</h4> |
| <pre><a href="../../../../../../org/apache/drill/exec/vector/accessor/ScalarWriter.html" title="interface in org.apache.drill.exec.vector.accessor">ScalarWriter</a> scalar(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</pre> |
| </li> |
| </ul> |
| <a name="tuple--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>tuple</h4> |
| <pre><a href="../../../../../../org/apache/drill/exec/vector/accessor/TupleWriter.html" title="interface in org.apache.drill.exec.vector.accessor">TupleWriter</a> tuple()</pre> |
| </li> |
| </ul> |
| <a name="array--"> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>array</h4> |
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