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| <h2 title="接口 SqlReturnTypeInference" class="title">接口 SqlReturnTypeInference</h2> |
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| <dt>所有已知实现类:</dt> |
| <dd><a href="../../../../../org/apache/calcite/sql/type/CursorReturnTypeInference.html" title="org.apache.calcite.sql.type中的类">CursorReturnTypeInference</a>, <a href="../../../../../org/apache/calcite/sql/type/ExplicitReturnTypeInference.html" title="org.apache.calcite.sql.type中的类">ExplicitReturnTypeInference</a>, <a href="../../../../../org/apache/calcite/sql/type/MatchReturnTypeInference.html" title="org.apache.calcite.sql.type中的类">MatchReturnTypeInference</a>, <a href="../../../../../org/apache/calcite/sql/type/OrdinalReturnTypeInference.html" title="org.apache.calcite.sql.type中的类">OrdinalReturnTypeInference</a>, <a href="../../../../../org/apache/calcite/sql/type/SqlReturnTypeInferenceChain.html" title="org.apache.calcite.sql.type中的类">SqlReturnTypeInferenceChain</a>, <a href="../../../../../org/apache/calcite/sql/type/SqlTypeTransformCascade.html" title="org.apache.calcite.sql.type中的类">SqlTypeTransformCascade</a>, <a href="../../../../../org/apache/calcite/sql/type/TableFunctionReturnTypeInference.html" title="org.apache.calcite.sql.type中的类">TableFunctionReturnTypeInference</a></dd> |
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| <pre>public interface <span class="typeNameLabel">SqlReturnTypeInference</span></pre> |
| <div class="block">Strategy interface to infer the type of an operator call from the type of the |
| operands. |
| |
| <p>This interface is an example of the |
| <a href="../../../../../org/apache/calcite/util/Glossary.html#STRATEGY_PATTERN"><code>strategy pattern</code></a>. |
| This makes |
| sense because many operators have similar, straightforward strategies, such |
| as to take the type of the first operand.</p></div> |
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| <td class="colFirst"><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/type/SqlReturnTypeInference.html#inferReturnType-org.apache.calcite.sql.SqlOperatorBinding-">inferReturnType</a></span>(<a href="../../../../../org/apache/calcite/sql/SqlOperatorBinding.html" title="org.apache.calcite.sql中的类">SqlOperatorBinding</a> opBinding)</code> |
| <div class="block">Infers the return type of a call to an <a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="org.apache.calcite.sql中的类"><code>SqlOperator</code></a>.</div> |
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| <h4>inferReturnType</h4> |
| <pre><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a> inferReturnType(<a href="../../../../../org/apache/calcite/sql/SqlOperatorBinding.html" title="org.apache.calcite.sql中的类">SqlOperatorBinding</a> opBinding)</pre> |
| <div class="block">Infers the return type of a call to an <a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="org.apache.calcite.sql中的类"><code>SqlOperator</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>opBinding</code> - description of operator binding</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>inferred type; may be null</dd> |
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