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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rel.metadata</a></div> |
| <h2 title="Interface BuiltInMetadata.ColumnOrigin" class="title">Interface BuiltInMetadata.ColumnOrigin</h2> |
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| <pre>public static interface <span class="typeNameLabel">BuiltInMetadata.ColumnOrigin</span> |
| extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a></pre> |
| <div class="block">Metadata about the origins of columns.</div> |
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| <td class="colFirst"><code>static interface </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="BuiltInMetadata.ColumnOrigin.Handler.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.ColumnOrigin.Handler</a></span></code></th> |
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| <td class="colFirst"><code>static <a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><<a href="BuiltInMetadata.ColumnOrigin.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.ColumnOrigin</a>></code></td> |
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| <td class="colFirst"><code>java.util.Set<<a href="RelColumnOrigin.html" title="class in org.apache.calcite.rel.metadata">RelColumnOrigin</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getColumnOrigins(int)">getColumnOrigins</a></span>​(int outputColumn)</code></th> |
| <td class="colLast"> |
| <div class="block">For a given output column of an expression, determines all columns of |
| underlying tables which contribute to result values.</div> |
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| <code><a href="Metadata.html#rel()">rel</a></code></li> |
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| <pre>static final <a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><<a href="BuiltInMetadata.ColumnOrigin.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.ColumnOrigin</a>> DEF</pre> |
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| <h4>getColumnOrigins</h4> |
| <pre class="methodSignature">java.util.Set<<a href="RelColumnOrigin.html" title="class in org.apache.calcite.rel.metadata">RelColumnOrigin</a>> getColumnOrigins​(int outputColumn)</pre> |
| <div class="block">For a given output column of an expression, determines all columns of |
| underlying tables which contribute to result values. An output column may |
| have more than one origin due to expressions such as Union and |
| LogicalProject. The optimizer may use this information for catalog access |
| (e.g. index availability).</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>outputColumn</code> - 0-based ordinal for output column of interest</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>set of origin columns, or null if this information cannot be |
| determined (whereas empty set indicates definitely no origin columns at |
| all)</dd> |
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