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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.sql.type</a></div> |
| <h2 title="Interface SqlReturnTypeInference" class="title">Interface SqlReturnTypeInference</h2> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="CursorReturnTypeInference.html" title="class in org.apache.calcite.sql.type">CursorReturnTypeInference</a></code>, <code><a href="ExplicitReturnTypeInference.html" title="class in org.apache.calcite.sql.type">ExplicitReturnTypeInference</a></code>, <code><a href="MatchReturnTypeInference.html" title="class in org.apache.calcite.sql.type">MatchReturnTypeInference</a></code>, <code><a href="OrdinalReturnTypeInference.html" title="class in org.apache.calcite.sql.type">OrdinalReturnTypeInference</a></code>, <code><a href="SqlReturnTypeInferenceChain.html" title="class in org.apache.calcite.sql.type">SqlReturnTypeInferenceChain</a></code>, <code><a href="SqlTypeTransformCascade.html" title="class in org.apache.calcite.sql.type">SqlTypeTransformCascade</a></code>, <code><a href="TableFunctionReturnTypeInference.html" title="class in org.apache.calcite.sql.type">TableFunctionReturnTypeInference</a></code></dd> |
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| <dl> |
| <dt>Functional Interface:</dt> |
| <dd>This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.</dd> |
| </dl> |
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| <pre><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/FunctionalInterface.html?is-external=true" title="class or interface in java.lang" class="externalLink">@FunctionalInterface</a> |
| 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="../../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.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="ReturnTypes.html" title="class in org.apache.calcite.sql.type"><code>ReturnTypes</code></a></dd> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>default <a href="SqlReturnTypeInference.html" title="interface in org.apache.calcite.sql.type">SqlReturnTypeInference</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#andThen(org.apache.calcite.sql.type.SqlTypeTransform)">andThen</a></span>​(<a href="SqlTypeTransform.html" title="interface in org.apache.calcite.sql.type">SqlTypeTransform</a> transform)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns a return-type inference that applies this rule then a |
| transform.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#inferReturnType(org.apache.calcite.sql.SqlOperatorBinding)">inferReturnType</a></span>​(<a href="../SqlOperatorBinding.html" title="class in org.apache.calcite.sql">SqlOperatorBinding</a> opBinding)</code></th> |
| <td class="colLast"> |
| <div class="block">Infers the return type of a call to an <a href="../SqlOperator.html" title="class in org.apache.calcite.sql"><code>SqlOperator</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>default <a href="SqlReturnTypeInference.html" title="interface in org.apache.calcite.sql.type">SqlReturnTypeInference</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#orElse(org.apache.calcite.sql.type.SqlReturnTypeInference)">orElse</a></span>​(<a href="SqlReturnTypeInference.html" title="interface in org.apache.calcite.sql.type">SqlReturnTypeInference</a> transform)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns a return-type inference that applies this rule then another |
| rule, until one of them returns a not-null result.</div> |
| </td> |
| </tr> |
| </table> |
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| <h4>inferReturnType</h4> |
| <pre class="methodSignature"><a href="../../rel/type/RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a> inferReturnType​(<a href="../SqlOperatorBinding.html" title="class in org.apache.calcite.sql">SqlOperatorBinding</a> opBinding)</pre> |
| <div class="block">Infers the return type of a call to an <a href="../SqlOperator.html" title="class in org.apache.calcite.sql"><code>SqlOperator</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>opBinding</code> - description of operator binding</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>inferred type; may be null</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="andThen(org.apache.calcite.sql.type.SqlTypeTransform)"> |
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| <h4>andThen</h4> |
| <pre class="methodSignature">default <a href="SqlReturnTypeInference.html" title="interface in org.apache.calcite.sql.type">SqlReturnTypeInference</a> andThen​(<a href="SqlTypeTransform.html" title="interface in org.apache.calcite.sql.type">SqlTypeTransform</a> transform)</pre> |
| <div class="block">Returns a return-type inference that applies this rule then a |
| transform.</div> |
| </li> |
| </ul> |
| <a id="orElse(org.apache.calcite.sql.type.SqlReturnTypeInference)"> |
| <!-- --> |
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| <h4>orElse</h4> |
| <pre class="methodSignature">default <a href="SqlReturnTypeInference.html" title="interface in org.apache.calcite.sql.type">SqlReturnTypeInference</a> orElse​(<a href="SqlReturnTypeInference.html" title="interface in org.apache.calcite.sql.type">SqlReturnTypeInference</a> transform)</pre> |
| <div class="block">Returns a return-type inference that applies this rule then another |
| rule, until one of them returns a not-null result.</div> |
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