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| <h2 title="Interface ColumnProjection" class="title">Interface ColumnProjection</h2> |
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| <dd><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/AbstractUnresolvedColumn.html" title="class in org.apache.drill.exec.physical.impl.scan.project">AbstractUnresolvedColumn</a>, <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/AbstractUnresolvedColumn.UnresolvedColumn.html" title="class in org.apache.drill.exec.physical.impl.scan.project">AbstractUnresolvedColumn.UnresolvedColumn</a>, <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/AbstractUnresolvedColumn.UnresolvedWildcardColumn.html" title="class in org.apache.drill.exec.physical.impl.scan.project">AbstractUnresolvedColumn.UnresolvedWildcardColumn</a>, <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/file/FileMetadataColumn.html" title="class in org.apache.drill.exec.physical.impl.scan.file">FileMetadataColumn</a>, <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/file/MetadataColumn.html" title="class in org.apache.drill.exec.physical.impl.scan.file">MetadataColumn</a>, <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/file/PartitionColumn.html" title="class in org.apache.drill.exec.physical.impl.scan.file">PartitionColumn</a>, <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/ResolvedColumn.html" title="class in org.apache.drill.exec.physical.impl.scan.project">ResolvedColumn</a>, <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/columns/ResolvedColumnsArrayColumn.html" title="class in org.apache.drill.exec.physical.impl.scan.columns">ResolvedColumnsArrayColumn</a>, <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/ResolvedDictColumn.html" title="class in org.apache.drill.exec.physical.impl.scan.project">ResolvedDictColumn</a>, <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/ResolvedMapColumn.html" title="class in org.apache.drill.exec.physical.impl.scan.project">ResolvedMapColumn</a>, <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/ResolvedNullColumn.html" title="class in org.apache.drill.exec.physical.impl.scan.project">ResolvedNullColumn</a>, <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/ResolvedTableColumn.html" title="class in org.apache.drill.exec.physical.impl.scan.project">ResolvedTableColumn</a>, <a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/columns/UnresolvedColumnsArrayColumn.html" title="class in org.apache.drill.exec.physical.impl.scan.columns">UnresolvedColumnsArrayColumn</a></dd> |
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| <pre>public interface <span class="typeNameLabel">ColumnProjection</span></pre> |
| <div class="block">Core interface for a projected column. Models a column throughout the |
| projection lifecycle. Columns evolve from unresolved to resolved at |
| different times. Each class that derives from this interface can act |
| as a column "node", while declaring its type so it may be processed |
| easily at the proper type. |
| <p> |
| For example, an implicit column is processed at the file schema |
| resolution phase, converting from unresolved to resolved. At the same |
| time, table columns remain unresolved, waiting for the table schema |
| to appear. |
| <p> |
| In an advanced, experimental feature, schema persistence sees some |
| columns transition from resolved to unresolved and back again. |
| <p> |
| Having all column nodes derive from this same interface keeps things |
| tidy.</div> |
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| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/ColumnProjection.html#name--">name</a></span>()</code> |
| <div class="block">The name of the column as it appears in the output |
| row (record batch.)</div> |
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| <h4>name</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name()</pre> |
| <div class="block">The name of the column as it appears in the output |
| row (record batch.)</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the output column name</dd> |
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