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| <div class="subTitle">org.apache.drill.exec.physical.resultSet.impl</div> |
| <h2 title="Class ColumnBuilder" class="title">Class ColumnBuilder</h2> |
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| <li>org.apache.drill.exec.physical.resultSet.impl.ColumnBuilder</li> |
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| <pre>public class <span class="typeNameLabel">ColumnBuilder</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">Algorithms for building a column given a metadata description of the column and |
| the parent context that will hold the column. |
| <p> |
| Does not support recursive column creation. For the most part, composite columns |
| (maps, map arrays, unions and lists) must start empty. Build the composite first, |
| then add its members using the writer for the column. This ensures a uniform API |
| for adding columns whether done dynamically at read time or statically at create |
| time. |
| <p> |
| The single exception is the case of a list with exactly one type: in this case |
| the list metadata must contain that one type so the code knows how to build |
| the nullable array writer for that column. |
| <p> |
| Merges the project list with the column to be built. If the column is not |
| projected (not in the list), then creates a dummy writer. Issues an error if |
| the column is projected, but the implied projection type is incompatible with |
| the actual type. (Such as trying to project an INT as x[0].) |
| <p> |
| This class builds the internal structure of a vector. If building a "container" |
| vector (map, list, repeated list or union), this class expects the container |
| to be added empty, then the members to be added one by one. See |
| <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/impl/BuildFromSchema.html" title="class in org.apache.drill.exec.physical.resultSet.impl"><code>BuildFromSchema</code></a> for the class that builds up a compound structure.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/impl/ColumnBuilder.html#ColumnBuilder--">ColumnBuilder</a></span>()</code> </td> |
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| <td class="colFirst"><code><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/impl/ColumnState.html" title="class in org.apache.drill.exec.physical.resultSet.impl">ColumnState</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/physical/resultSet/impl/ColumnBuilder.html#buildColumn-org.apache.drill.exec.physical.resultSet.impl.ContainerState-org.apache.drill.exec.record.metadata.ColumnMetadata-">buildColumn</a></span>(<a href="../../../../../../../org/apache/drill/exec/physical/resultSet/impl/ContainerState.html" title="class in org.apache.drill.exec.physical.resultSet.impl">ContainerState</a> parent, |
| <a href="../../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> columnSchema)</code> |
| <div class="block">Implementation of the work to add a new column to this tuple given a |
| schema description of the column.</div> |
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| <h4>ColumnBuilder</h4> |
| <pre>public ColumnBuilder()</pre> |
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| <h4>buildColumn</h4> |
| <pre>public <a href="../../../../../../../org/apache/drill/exec/physical/resultSet/impl/ColumnState.html" title="class in org.apache.drill.exec.physical.resultSet.impl">ColumnState</a> buildColumn(<a href="../../../../../../../org/apache/drill/exec/physical/resultSet/impl/ContainerState.html" title="class in org.apache.drill.exec.physical.resultSet.impl">ContainerState</a> parent, |
| <a href="../../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> columnSchema)</pre> |
| <div class="block">Implementation of the work to add a new column to this tuple given a |
| schema description of the column.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>parent</code> - container of vectors</dd> |
| <dd><code>columnSchema</code> - schema of the column as provided by the client |
| using the result set loader. This is the schema of the data to be |
| loaded</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>writer for the new column</dd> |
| </dl> |
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