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| <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="../../../../../org/apache/calcite/rel/metadata/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> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.ColumnOrigin.Handler.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.ColumnOrigin.Handler</a></span></code> |
| <div class="block">Handler API.</div> |
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| <td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/rel/metadata/MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><<a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.ColumnOrigin.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.ColumnOrigin</a>></code></td> |
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| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="../../../../../org/apache/calcite/rel/metadata/RelColumnOrigin.html" title="class in org.apache.calcite.rel.metadata">RelColumnOrigin</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.ColumnOrigin.html#getColumnOrigins-int-">getColumnOrigins</a></span>(int outputColumn)</code> |
| <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="../../../../../org/apache/calcite/rel/metadata/Metadata.html#rel--">rel</a></code></li> |
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| <pre>static final <a href="../../../../../org/apache/calcite/rel/metadata/MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><<a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.ColumnOrigin.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.ColumnOrigin</a>> DEF</pre> |
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| <h4>getColumnOrigins</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="../../../../../org/apache/calcite/rel/metadata/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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