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| <h2 title="接口 SqlSingleOperandTypeChecker" class="title">接口 SqlSingleOperandTypeChecker</h2> |
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| <dt>所有超级接口:</dt> |
| <dd><a href="../../../../../org/apache/calcite/sql/type/SqlOperandTypeChecker.html" title="org.apache.calcite.sql.type中的接口">SqlOperandTypeChecker</a></dd> |
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| <dt>所有已知实现类:</dt> |
| <dd><a href="../../../../../org/apache/calcite/sql/type/ComparableOperandTypeChecker.html" title="org.apache.calcite.sql.type中的类">ComparableOperandTypeChecker</a>, <a href="../../../../../org/apache/calcite/sql/type/CompositeSingleOperandTypeChecker.html" title="org.apache.calcite.sql.type中的类">CompositeSingleOperandTypeChecker</a>, <a href="../../../../../org/apache/calcite/sql/type/FamilyOperandTypeChecker.html" title="org.apache.calcite.sql.type中的类">FamilyOperandTypeChecker</a>, <a href="../../../../../org/apache/calcite/sql/type/LiteralOperandTypeChecker.html" title="org.apache.calcite.sql.type中的类">LiteralOperandTypeChecker</a>, <a href="../../../../../org/apache/calcite/sql/type/SameOperandTypeChecker.html" title="org.apache.calcite.sql.type中的类">SameOperandTypeChecker</a>, <a href="../../../../../org/apache/calcite/sql/type/SameOperandTypeExceptLastOperandChecker.html" title="org.apache.calcite.sql.type中的类">SameOperandTypeExceptLastOperandChecker</a></dd> |
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| <pre>public interface <span class="typeNameLabel">SqlSingleOperandTypeChecker</span> |
| extends <a href="../../../../../org/apache/calcite/sql/type/SqlOperandTypeChecker.html" title="org.apache.calcite.sql.type中的接口">SqlOperandTypeChecker</a></pre> |
| <div class="block">SqlSingleOperandTypeChecker is an extension of <a href="../../../../../org/apache/calcite/sql/type/SqlOperandTypeChecker.html" title="org.apache.calcite.sql.type中的接口"><code>SqlOperandTypeChecker</code></a> |
| for implementations which are capable of checking the type of a single |
| operand in isolation. This isn't meaningful for all type-checking rules (e.g. |
| SameOperandTypeChecker requires two operands to have matching types, so |
| checking one in isolation is meaningless).</div> |
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| <h3>从接口继承的嵌套类/接口 org.apache.calcite.sql.type.<a href="../../../../../org/apache/calcite/sql/type/SqlOperandTypeChecker.html" title="org.apache.calcite.sql.type中的接口">SqlOperandTypeChecker</a></h3> |
| <code><a href="../../../../../org/apache/calcite/sql/type/SqlOperandTypeChecker.Consistency.html" title="org.apache.calcite.sql.type中的枚举">SqlOperandTypeChecker.Consistency</a></code></li> |
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| <th class="colFirst" scope="col">限定符和类型</th> |
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| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/type/SqlSingleOperandTypeChecker.html#checkSingleOperandType-org.apache.calcite.sql.SqlCallBinding-org.apache.calcite.sql.SqlNode-int-boolean-">checkSingleOperandType</a></span>(<a href="../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a> callBinding, |
| <a href="../../../../../org/apache/calcite/sql/SqlNode.html" title="org.apache.calcite.sql中的类">SqlNode</a> operand, |
| int iFormalOperand, |
| boolean throwOnFailure)</code> |
| <div class="block">Checks the type of a single operand against a particular ordinal position |
| within a formal operator signature.</div> |
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| <h3>从接口继承的方法 org.apache.calcite.sql.type.<a href="../../../../../org/apache/calcite/sql/type/SqlOperandTypeChecker.html" title="org.apache.calcite.sql.type中的接口">SqlOperandTypeChecker</a></h3> |
| <code><a href="../../../../../org/apache/calcite/sql/type/SqlOperandTypeChecker.html#checkOperandTypes-org.apache.calcite.sql.SqlCallBinding-boolean-">checkOperandTypes</a>, <a href="../../../../../org/apache/calcite/sql/type/SqlOperandTypeChecker.html#getAllowedSignatures-org.apache.calcite.sql.SqlOperator-java.lang.String-">getAllowedSignatures</a>, <a href="../../../../../org/apache/calcite/sql/type/SqlOperandTypeChecker.html#getConsistency--">getConsistency</a>, <a href="../../../../../org/apache/calcite/sql/type/SqlOperandTypeChecker.html#getOperandCountRange--">getOperandCountRange</a>, <a href="../../../../../org/apache/calcite/sql/type/SqlOperandTypeChecker.html#isOptional-int-">isOptional</a></code></li> |
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| <h3>方法详细资料</h3> |
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| <h4>checkSingleOperandType</h4> |
| <pre>boolean checkSingleOperandType(<a href="../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a> callBinding, |
| <a href="../../../../../org/apache/calcite/sql/SqlNode.html" title="org.apache.calcite.sql中的类">SqlNode</a> operand, |
| int iFormalOperand, |
| boolean throwOnFailure)</pre> |
| <div class="block">Checks the type of a single operand against a particular ordinal position |
| within a formal operator signature. Note that the actual ordinal position |
| of the operand being checked may be <em>different</em> from the position |
| of the formal operand. |
| |
| <p>For example, when validating the actual call |
| |
| <blockquote> |
| <pre>C(X, Y, Z)</pre> |
| </blockquote> |
| |
| <p>the strategy for validating the operand Z might involve checking its |
| type against the formal signature OP(W). In this case, |
| <code>iFormalOperand</code> would be zero, even though the position of Z |
| within call C is two. |
| |
| <p>Caution that we could not(shouldn't) implement implicit type coercion for this checker, |
| implicit type coercion has side effect(modify the AST), if this single operand checker is |
| subsumed in a composite rule(OR or AND), we can not make any side effect if we |
| can not make sure that all the single operands type check are passed(with type coercion). |
| But there is an exception: only if the call has just one operand, for this case, |
| use <a href="../../../../../org/apache/calcite/sql/type/SqlOperandTypeChecker.html#checkOperandTypes-org.apache.calcite.sql.SqlCallBinding-boolean-"><code>SqlOperandTypeChecker.checkOperandTypes(org.apache.calcite.sql.SqlCallBinding, boolean)</code></a> instead.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>callBinding</code> - description of the call being checked; this is only |
| provided for context when throwing an exception; the |
| implementation should <em>NOT</em> examine the |
| operands of the call as part of the check</dd> |
| <dd><code>operand</code> - the actual operand to be checked</dd> |
| <dd><code>iFormalOperand</code> - the 0-based formal operand ordinal</dd> |
| <dd><code>throwOnFailure</code> - whether to throw an exception if check fails |
| (otherwise returns false in that case)</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>whether check succeeded</dd> |
| </dl> |
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