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| <h2 title="Uses of Class org.apache.drill.exec.physical.impl.scan.project.StaticColumnLoader" class="title">Uses of Class<br>org.apache.drill.exec.physical.impl.scan.project.StaticColumnLoader</h2> |
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| <div class="block">Provides run-time semantic analysis of the projection list for the |
| scan operator.</div> |
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| <h3>Uses of <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/StaticColumnLoader.html" title="class in org.apache.drill.exec.physical.impl.scan.project">StaticColumnLoader</a> in <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/package-summary.html">org.apache.drill.exec.physical.impl.scan.project</a></h3> |
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| <caption><span>Subclasses of <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/StaticColumnLoader.html" title="class in org.apache.drill.exec.physical.impl.scan.project">StaticColumnLoader</a> in <a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/package-summary.html">org.apache.drill.exec.physical.impl.scan.project</a></span><span class="tabEnd"> </span></caption> |
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| <td class="colFirst"><code>class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/ConstantColumnLoader.html" title="class in org.apache.drill.exec.physical.impl.scan.project">ConstantColumnLoader</a></span></code> |
| <div class="block">Populate metadata columns either file metadata (AKA "implicit |
| columns") or directory metadata (AKA "partition columns.") In both |
| cases the column type is nullable Varchar and the column value |
| is predefined by the projection planner; this class just copies |
| that value into each row.</div> |
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| <td class="colFirst"><code>class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/drill/exec/physical/impl/scan/project/NullColumnLoader.html" title="class in org.apache.drill.exec.physical.impl.scan.project">NullColumnLoader</a></span></code> |
| <div class="block">Create and populate null columns for the case in which a SELECT statement |
| refers to columns that do not exist in the actual table.</div> |
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