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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.calcite.rel.metadata</a></div> |
| <h1 title="Interface BuiltInMetadata.ExpressionLineage" class="title">Interface BuiltInMetadata.ExpressionLineage</h1> |
| </div> |
| <section class="class-description" id="class-description"> |
| <dl class="notes"> |
| <dt>All Superinterfaces:</dt> |
| <dd><code><a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a></code></dd> |
| </dl> |
| <dl class="notes"> |
| <dt>Enclosing class:</dt> |
| <dd><a href="BuiltInMetadata.html" title="class in org.apache.calcite.rel.metadata">BuiltInMetadata</a></dd> |
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| <div class="type-signature"><span class="modifiers">public static interface </span><span class="element-name type-name-label">BuiltInMetadata.ExpressionLineage</span><span class="extends-implements"> |
| extends <a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a></span></div> |
| <div class="block">Metadata about the origins of expressions.</div> |
| </section> |
| <section class="summary"> |
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| <div class="col-first even-row-color"><code>static interface </code></div> |
| <div class="col-second even-row-color"><code><a href="BuiltInMetadata.ExpressionLineage.Handler.html" class="type-name-link" title="interface in org.apache.calcite.rel.metadata">BuiltInMetadata.ExpressionLineage.Handler</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Handler API.</div> |
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| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Field</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color"><code>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>></code></div> |
| <div class="col-second even-row-color"><code><a href="#DEF" class="member-name-link">DEF</a></code></div> |
| <div class="col-last even-row-color"> </div> |
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| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
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| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>@Nullable <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Set.html" title="class or interface in java.util" class="external-link">Set</a><<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getExpressionLineage(org.apache.calcite.rex.RexNode)" class="member-name-link">getExpressionLineage</a><wbr>(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> expression)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <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> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-org.apache.calcite.rel.metadata.Metadata">Methods inherited from interface org.apache.calcite.rel.metadata.<a href="Metadata.html" title="interface in org.apache.calcite.rel.metadata">Metadata</a></h3> |
| <code><a href="Metadata.html#rel()">rel</a></code></div> |
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| <h2>Field Details</h2> |
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| <section class="detail" id="DEF"> |
| <h3>DEF</h3> |
| <div class="member-signature"><span class="modifiers">static final</span> <span class="return-type"><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>></span> <span class="element-name">DEF</span></div> |
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| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="getExpressionLineage(org.apache.calcite.rex.RexNode)"> |
| <h3>getExpressionLineage</h3> |
| <div class="member-signature"><span class="return-type">@Nullable <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Set.html" title="class or interface in java.util" class="external-link">Set</a><<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>></span> <span class="element-name">getExpressionLineage</span><wbr><span class="parameters">(<a href="../../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> expression)</span></div> |
| <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 class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>expression</code> - expression whose lineage we want to resolve</dd> |
| <dt>Returns:</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> |
| </dl> |
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