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| <h2 title="接口 BuiltInMetadata.ExpressionLineage" class="title">接口 BuiltInMetadata.ExpressionLineage</h2> |
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| <dt>所有超级接口:</dt> |
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| <pre>public static interface <span class="typeNameLabel">BuiltInMetadata.ExpressionLineage</span> |
| extends <a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html" title="org.apache.calcite.rel.metadata中的接口">Metadata</a></pre> |
| <div class="block">Metadata about the origins of expressions.</div> |
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| <th class="colFirst" scope="col">限定符和类型</th> |
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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.ExpressionLineage.Handler.html" title="org.apache.calcite.rel.metadata中的接口">BuiltInMetadata.ExpressionLineage.Handler</a></span></code> |
| <div class="block">Handler API.</div> |
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| <h3>字段概要</h3> |
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| <td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/rel/metadata/MetadataDef.html" title="org.apache.calcite.rel.metadata中的类">MetadataDef</a><<a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.ExpressionLineage.html" title="org.apache.calcite.rel.metadata中的接口">BuiltInMetadata.ExpressionLineage</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.ExpressionLineage.html#DEF">DEF</a></span></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="java.util中的类或接口">Set</a><<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.ExpressionLineage.html#getExpressionLineage-org.apache.calcite.rex.RexNode-">getExpressionLineage</a></span>(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> expression)</code> |
| <div class="block">Given the input expression applied on the given <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口"><code>RelNode</code></a>, this |
| provider returns the expression with its lineage resolved.</div> |
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| <code><a href="../../../../../org/apache/calcite/rel/metadata/Metadata.html#rel--">rel</a></code></li> |
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| <h4>DEF</h4> |
| <pre>static final <a href="../../../../../org/apache/calcite/rel/metadata/MetadataDef.html" title="org.apache.calcite.rel.metadata中的类">MetadataDef</a><<a href="../../../../../org/apache/calcite/rel/metadata/BuiltInMetadata.ExpressionLineage.html" title="org.apache.calcite.rel.metadata中的接口">BuiltInMetadata.ExpressionLineage</a>> DEF</pre> |
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| <h4>getExpressionLineage</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="java.util中的类或接口">Set</a><<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a>> getExpressionLineage(<a href="../../../../../org/apache/calcite/rex/RexNode.html" title="org.apache.calcite.rex中的类">RexNode</a> expression)</pre> |
| <div class="block">Given the input expression applied on the given <a href="../../../../../org/apache/calcite/rel/RelNode.html" title="org.apache.calcite.rel中的接口"><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="../../../../../org/apache/calcite/rex/RexTableInputRef.html" title="org.apache.calcite.rex中的类"><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">参数:</span></dt> |
| <dd><code>expression</code> - expression whose lineage we want to resolve</dd> |
| <dt><span class="returnLabel">返回:</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="../../../../../org/apache/calcite/rel/core/Aggregate.html" title="org.apache.calcite.rel.core中的类"><code>Aggregate</code></a> operator)</dd> |
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