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<div class="subTitle">org.apache.calcite.sql.fun</div>
<h2 title="类 SqlCastFunction" class="title">类 SqlCastFunction</h2>
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<ul class="inheritance">
<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="java.lang中的类或接口">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="org.apache.calcite.sql中的类">org.apache.calcite.sql.SqlOperator</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/calcite/sql/SqlFunction.html" title="org.apache.calcite.sql中的类">org.apache.calcite.sql.SqlFunction</a></li>
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<li>org.apache.calcite.sql.fun.SqlCastFunction</li>
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<pre>public class <span class="typeNameLabel">SqlCastFunction</span>
extends <a href="../../../../../org/apache/calcite/sql/SqlFunction.html" title="org.apache.calcite.sql中的类">SqlFunction</a></pre>
<div class="block">SqlCastFunction. Note that the std functions are really singleton objects,
because they always get fetched via the StdOperatorTable. So you can't store
any local info in the class and hence the return type data is maintained in
operand[1] through the validation phase.
<p>Can be used for both <a href="../../../../../org/apache/calcite/sql/SqlCall.html" title="org.apache.calcite.sql中的类"><code>SqlCall</code></a> and
<a href="../../../../../org/apache/calcite/rex/RexCall.html" title="org.apache.calcite.rex中的类"><code>RexCall</code></a>.
Note that the <code>SqlCall</code> has two operands (expression and type),
while the <code>RexCall</code> has one operand (expression) and the type is
obtained from <a href="../../../../../org/apache/calcite/rex/RexNode.html#getType--"><code>RexNode.getType()</code></a>.</div>
<dl>
<dt><span class="seeLabel">另请参阅:</span></dt>
<dd><code>SqlCastOperator</code></dd>
</dl>
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<h3>从类继承的字段&nbsp;org.apache.calcite.sql.<a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="org.apache.calcite.sql中的类">SqlOperator</a></h3>
<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#kind">kind</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#MDX_PRECEDENCE">MDX_PRECEDENCE</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#NL">NL</a></code></li>
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<h3>构造器概要</h3>
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<th class="colOne" scope="col">构造器和说明</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCastFunction.html#SqlCastFunction--">SqlCastFunction</a></span>()</code>&nbsp;</td>
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<h3>方法概要</h3>
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<caption><span id="t0" class="activeTableTab"><span>所有方法</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">实例方法</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">具体方法</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">限定符和类型</th>
<th class="colLast" scope="col">方法和说明</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCastFunction.html#checkOperandTypes-org.apache.calcite.sql.SqlCallBinding-boolean-">checkOperandTypes</a></span>(<a href="../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a>&nbsp;callBinding,
boolean&nbsp;throwOnFailure)</code>
<div class="block">Makes sure that the number and types of arguments are allowable.</div>
</td>
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<td class="colFirst"><code><a href="../../../../../org/apache/calcite/sql/validate/SqlMonotonicity.html" title="org.apache.calcite.sql.validate中的枚举">SqlMonotonicity</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCastFunction.html#getMonotonicity-org.apache.calcite.sql.SqlOperatorBinding-">getMonotonicity</a></span>(<a href="../../../../../org/apache/calcite/sql/SqlOperatorBinding.html" title="org.apache.calcite.sql中的类">SqlOperatorBinding</a>&nbsp;call)</code>
<div class="block">Returns whether a call to this operator is monotonic.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/sql/SqlOperandCountRange.html" title="org.apache.calcite.sql中的接口">SqlOperandCountRange</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCastFunction.html#getOperandCountRange--">getOperandCountRange</a></span>()</code>
<div class="block">Returns a constraint on the number of operands expected by this operator.</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCastFunction.html#getSignatureTemplate-int-">getSignatureTemplate</a></span>(int&nbsp;operandsCount)</code>
<div class="block">Returns a template describing how the operator signature is to be built.</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/sql/SqlSyntax.html" title="org.apache.calcite.sql中的枚举">SqlSyntax</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCastFunction.html#getSyntax--">getSyntax</a></span>()</code>
<div class="block">Returns the syntactic type of this operator, never null.</div>
</td>
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<tr id="i5" class="rowColor">
<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/fun/SqlCastFunction.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>&nbsp;opBinding)</code>
<div class="block">Infers the return type of an invocation of this operator; only called
after the number and types of operands have already been validated.</div>
</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/fun/SqlCastFunction.html#unparse-org.apache.calcite.sql.SqlWriter-org.apache.calcite.sql.SqlCall-int-int-">unparse</a></span>(<a href="../../../../../org/apache/calcite/sql/SqlWriter.html" title="org.apache.calcite.sql中的接口">SqlWriter</a>&nbsp;writer,
<a href="../../../../../org/apache/calcite/sql/SqlCall.html" title="org.apache.calcite.sql中的类">SqlCall</a>&nbsp;call,
int&nbsp;leftPrec,
int&nbsp;rightPrec)</code>
<div class="block">Writes a SQL representation of a call to this operator to a writer,
including parentheses if the operators on either side are of greater
precedence.</div>
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<h3>从类继承的方法&nbsp;org.apache.calcite.sql.<a href="../../../../../org/apache/calcite/sql/SqlFunction.html" title="org.apache.calcite.sql中的类">SqlFunction</a></h3>
<code><a href="../../../../../org/apache/calcite/sql/SqlFunction.html#deriveType-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.validate.SqlValidatorScope-org.apache.calcite.sql.SqlCall-">deriveType</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#getFunctionType--">getFunctionType</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#getNameAsId--">getNameAsId</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#getParamNames--">getParamNames</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#getParamTypes--">getParamTypes</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#getSqlIdentifier--">getSqlIdentifier</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#isQuantifierAllowed--">isQuantifierAllowed</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#validateCall-org.apache.calcite.sql.SqlCall-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.validate.SqlValidatorScope-org.apache.calcite.sql.validate.SqlValidatorScope-">validateCall</a>, <a href="../../../../../org/apache/calcite/sql/SqlFunction.html#validateQuantifier-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.SqlCall-">validateQuantifier</a></code></li>
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<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#acceptCall-org.apache.calcite.sql.util.SqlVisitor-org.apache.calcite.sql.SqlCall-">acceptCall</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#acceptCall-org.apache.calcite.sql.util.SqlVisitor-org.apache.calcite.sql.SqlCall-boolean-org.apache.calcite.sql.util.SqlBasicVisitor.ArgHandler-">acceptCall</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#adjustType-org.apache.calcite.sql.validate.SqlValidator-org.apache.calcite.sql.SqlCall-org.apache.calcite.rel.type.RelDataType-">adjustType</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#allowsFraming--">allowsFraming</a>, <a href="../../../../../org/apache/calcite/sql/SqlOperator.html#argumentMustBeScalar-int-">argumentMustBeScalar</a>, <a 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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="java.lang中的类或接口">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="java.lang中的类或接口">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="java.lang中的类或接口">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="java.lang中的类或接口">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="java.lang中的类或接口">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="java.lang中的类或接口">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="java.lang中的类或接口">wait</a></code></li>
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<pre>public&nbsp;SqlCastFunction()</pre>
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<h4>inferReturnType</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;inferReturnType(<a href="../../../../../org/apache/calcite/sql/SqlOperatorBinding.html" title="org.apache.calcite.sql中的类">SqlOperatorBinding</a>&nbsp;opBinding)</pre>
<div class="block"><span class="descfrmTypeLabel">从类复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#inferReturnType-org.apache.calcite.sql.SqlOperatorBinding-">SqlOperator</a></code></span></div>
<div class="block">Infers the return type of an invocation of this operator; only called
after the number and types of operands have already been validated.
Subclasses must either override this method or supply an instance of
<a href="../../../../../org/apache/calcite/sql/type/SqlReturnTypeInference.html" title="org.apache.calcite.sql.type中的接口"><code>SqlReturnTypeInference</code></a> to the constructor.</div>
<dl>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#inferReturnType-org.apache.calcite.sql.SqlOperatorBinding-">inferReturnType</a></code>&nbsp;在类中&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="org.apache.calcite.sql中的类">SqlOperator</a></code></dd>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>opBinding</code> - description of invocation (not necessarily a
<a href="../../../../../org/apache/calcite/sql/SqlCall.html" title="org.apache.calcite.sql中的类"><code>SqlCall</code></a>)</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>inferred return type</dd>
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<h4>getSignatureTemplate</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>&nbsp;getSignatureTemplate(int&nbsp;operandsCount)</pre>
<div class="block"><span class="descfrmTypeLabel">从类复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getSignatureTemplate-int-">SqlOperator</a></code></span></div>
<div class="block">Returns a template describing how the operator signature is to be built.
E.g for the binary + operator the template looks like "{1} {0} {2}" {0}
is the operator, subsequent numbers are operands.</div>
<dl>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getSignatureTemplate-int-">getSignatureTemplate</a></code>&nbsp;在类中&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="org.apache.calcite.sql中的类">SqlOperator</a></code></dd>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>operandsCount</code> - is used with functions that can take a variable
number of operands</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>signature template, or null to indicate that a default template
will suffice</dd>
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<h4>getOperandCountRange</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/calcite/sql/SqlOperandCountRange.html" title="org.apache.calcite.sql中的接口">SqlOperandCountRange</a>&nbsp;getOperandCountRange()</pre>
<div class="block"><span class="descfrmTypeLabel">从类复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getOperandCountRange--">SqlOperator</a></code></span></div>
<div class="block">Returns a constraint on the number of operands expected by this operator.
Subclasses may override this method; when they don't, the range is
derived from the <a href="../../../../../org/apache/calcite/sql/type/SqlOperandTypeChecker.html" title="org.apache.calcite.sql.type中的接口"><code>SqlOperandTypeChecker</code></a> associated with this
operator.</div>
<dl>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getOperandCountRange--">getOperandCountRange</a></code>&nbsp;在类中&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="org.apache.calcite.sql中的类">SqlOperator</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>acceptable range</dd>
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<h4>checkOperandTypes</h4>
<pre>public&nbsp;boolean&nbsp;checkOperandTypes(<a href="../../../../../org/apache/calcite/sql/SqlCallBinding.html" title="org.apache.calcite.sql中的类">SqlCallBinding</a>&nbsp;callBinding,
boolean&nbsp;throwOnFailure)</pre>
<div class="block">Makes sure that the number and types of arguments are allowable.
Operators (such as "ROW" and "AS") which do not check their arguments can
override this method.</div>
<dl>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#checkOperandTypes-org.apache.calcite.sql.SqlCallBinding-boolean-">checkOperandTypes</a></code>&nbsp;在类中&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="org.apache.calcite.sql中的类">SqlOperator</a></code></dd>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>callBinding</code> - description of call</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>
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<pre>public&nbsp;<a href="../../../../../org/apache/calcite/sql/SqlSyntax.html" title="org.apache.calcite.sql中的枚举">SqlSyntax</a>&nbsp;getSyntax()</pre>
<div class="block"><span class="descfrmTypeLabel">从类复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getSyntax--">SqlOperator</a></code></span></div>
<div class="block">Returns the syntactic type of this operator, never null.</div>
<dl>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/sql/SqlFunction.html#getSyntax--">getSyntax</a></code>&nbsp;在类中&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlFunction.html" title="org.apache.calcite.sql中的类">SqlFunction</a></code></dd>
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<a name="unparse-org.apache.calcite.sql.SqlWriter-org.apache.calcite.sql.SqlCall-int-int-">
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<h4>unparse</h4>
<pre>public&nbsp;void&nbsp;unparse(<a href="../../../../../org/apache/calcite/sql/SqlWriter.html" title="org.apache.calcite.sql中的接口">SqlWriter</a>&nbsp;writer,
<a href="../../../../../org/apache/calcite/sql/SqlCall.html" title="org.apache.calcite.sql中的类">SqlCall</a>&nbsp;call,
int&nbsp;leftPrec,
int&nbsp;rightPrec)</pre>
<div class="block"><span class="descfrmTypeLabel">从类复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#unparse-org.apache.calcite.sql.SqlWriter-org.apache.calcite.sql.SqlCall-int-int-">SqlOperator</a></code></span></div>
<div class="block">Writes a SQL representation of a call to this operator to a writer,
including parentheses if the operators on either side are of greater
precedence.
<p>The default implementation of this method delegates to
<a href="../../../../../org/apache/calcite/sql/SqlSyntax.html#unparse-org.apache.calcite.sql.SqlWriter-org.apache.calcite.sql.SqlOperator-org.apache.calcite.sql.SqlCall-int-int-"><code>SqlSyntax.unparse(org.apache.calcite.sql.SqlWriter, org.apache.calcite.sql.SqlOperator, org.apache.calcite.sql.SqlCall, int, int)</code></a>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/sql/SqlFunction.html#unparse-org.apache.calcite.sql.SqlWriter-org.apache.calcite.sql.SqlCall-int-int-">unparse</a></code>&nbsp;在类中&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlFunction.html" title="org.apache.calcite.sql中的类">SqlFunction</a></code></dd>
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<h4>getMonotonicity</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/calcite/sql/validate/SqlMonotonicity.html" title="org.apache.calcite.sql.validate中的枚举">SqlMonotonicity</a>&nbsp;getMonotonicity(<a href="../../../../../org/apache/calcite/sql/SqlOperatorBinding.html" title="org.apache.calcite.sql中的类">SqlOperatorBinding</a>&nbsp;call)</pre>
<div class="block"><span class="descfrmTypeLabel">从类复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getMonotonicity-org.apache.calcite.sql.SqlOperatorBinding-">SqlOperator</a></code></span></div>
<div class="block">Returns whether a call to this operator is monotonic.
<p>Default implementation returns <a href="../../../../../org/apache/calcite/sql/validate/SqlMonotonicity.html#NOT_MONOTONIC"><code>SqlMonotonicity.NOT_MONOTONIC</code></a>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html#getMonotonicity-org.apache.calcite.sql.SqlOperatorBinding-">getMonotonicity</a></code>&nbsp;在类中&nbsp;<code><a href="../../../../../org/apache/calcite/sql/SqlOperator.html" title="org.apache.calcite.sql中的类">SqlOperator</a></code></dd>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>call</code> - Call to this operator with particular arguments and information
about the monotonicity of the arguments</dd>
</dl>
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