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| <pre>public static interface <span class="typeNameLabel">BuiltInMetadata.ExpressionLineage</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 expressions.</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.ExpressionLineage.Handler.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.ExpressionLineage.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.ExpressionLineage.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.ExpressionLineage</a>></code></td> |
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| <td class="colFirst"><code>java.util.Set<<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getExpressionLineage(org.apache.calcite.rex.RexNode)">getExpressionLineage</a></span>​(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> expression)</code></th> |
| <td class="colLast"> |
| <div class="block">Given the input expression applied on the given <a href="../RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a>, this |
| provider returns the expression with its lineage resolved.</div> |
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| <code><a href="Metadata.html#rel()">rel</a></code></li> |
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| <h4>DEF</h4> |
| <pre>static final <a href="MetadataDef.html" title="class in org.apache.calcite.rel.metadata">MetadataDef</a><<a href="BuiltInMetadata.ExpressionLineage.html" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.ExpressionLineage</a>> DEF</pre> |
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| <h4>getExpressionLineage</h4> |
| <pre class="methodSignature">java.util.Set<<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> getExpressionLineage​(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> expression)</pre> |
| <div class="block">Given the input expression applied on the given <a href="../RelNode.html" title="interface in org.apache.calcite.rel"><code>RelNode</code></a>, this |
| provider returns the expression with its lineage resolved. |
| |
| <p>In particular, the result will be a set of nodes which might contain |
| references to columns in TableScan operators (<a href="../../rex/RexTableInputRef.html" title="class in org.apache.calcite.rex"><code>RexTableInputRef</code></a>). |
| An expression can have more than one lineage expression due to Union |
| operators. However, we do not check column equality in Filter predicates. |
| Each TableScan operator below the node is identified uniquely by its |
| qualified name and its entity number. |
| |
| <p>For example, if the expression is <code>$0 + 2</code> and <code>$0</code> originated |
| from column <code>$3</code> in the <code>0</code> occurrence of table <code>A</code> in the |
| plan, result will be: <code>A.#0.$3 + 2</code>. Occurrences are generated in no |
| particular order, but it is guaranteed that if two expressions referred to the |
| same table, the qualified name + occurrence will be the same.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>expression</code> - expression whose lineage we want to resolve</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>set of expressions with lineage resolved, or null if this information |
| cannot be determined (e.g. origin of an expression is an aggregation |
| in an <a href="../core/Aggregate.html" title="class in org.apache.calcite.rel.core"><code>Aggregate</code></a> operator)</dd> |
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