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<div class="subTitle">org.apache.calcite.sql.type</div>
<h2 title="类 SqlTypeCoercionRule" class="title">类 SqlTypeCoercionRule</h2>
</div>
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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>
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<li>org.apache.calcite.sql.type.SqlTypeCoercionRule</li>
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<div class="description">
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<dl>
<dt>所有已实现的接口:</dt>
<dd><a href="../../../../../org/apache/calcite/sql/type/SqlTypeMappingRule.html" title="org.apache.calcite.sql.type中的接口">SqlTypeMappingRule</a></dd>
</dl>
<hr>
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<pre>public class <span class="typeNameLabel">SqlTypeCoercionRule</span>
extends <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">Object</a>
implements <a href="../../../../../org/apache/calcite/sql/type/SqlTypeMappingRule.html" title="org.apache.calcite.sql.type中的接口">SqlTypeMappingRule</a></pre>
<div class="block">Rules that determine whether a type is castable from another type.
<p>These rules specify the conversion matrix with explicit CAST.
<p>The implicit type coercion matrix should be a sub-set of this explicit one.
We do not define an implicit type coercion matrix, instead we have specific
coercion rules for all kinds of SQL contexts which actually define the "matrix".
<p>To add a new implementation to this class, follow
these steps:
<ol>
<li>Initialize a <a href="../../../../../org/apache/calcite/sql/type/SqlTypeMappingRules.Builder.html" title="org.apache.calcite.sql.type中的类"><code>SqlTypeMappingRules.Builder</code></a> instance
with default mappings of <a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html#INSTANCE"><code>INSTANCE</code></a>.</li>
<li>Modify the mappings with the Builder.</li>
<li>Construct a new <a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html" title="org.apache.calcite.sql.type中的类"><code>SqlTypeCoercionRule</code></a> instance with method
<a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html#instance-java.util.Map-"><code>instance(Map)</code></a>.</li>
<li>Set the <a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html" title="org.apache.calcite.sql.type中的类"><code>SqlTypeCoercionRule</code></a> instance into the
<a href="../../../../../org/apache/calcite/sql/validate/SqlValidator.html" title="org.apache.calcite.sql.validate中的接口"><code>SqlValidator</code></a>.</li>
</ol>
<p>The code snippet below illustrates how to implement a customized instance.
<pre>
// Initialize a Builder instance with the default mappings.
Builder builder = SqlTypeMappingRules.builder();
builder.addAll(SqlTypeCoercionRules.instance().getTypeMapping());
// Do the tweak, for example, if we want to add a rule to allow
// coerce BOOLEAN to TIMESTAMP.
builder.add(SqlTypeName.TIMESTAMP,
builder.copyValues(SqlTypeName.TIMESTAMP)
.add(SqlTypeName.BOOLEAN).build());
// Initialize a SqlTypeCoercionRules with the new builder mappings.
SqlTypeCoercionRules typeCoercionRules = SqlTypeCoercionRules.instance(builder.map);
// Set the SqlTypeCoercionRules instance into the SqlValidator.
SqlValidator validator ...;
validator.setSqlTypeCoercionRules(typeCoercionRules);
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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 <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ThreadLocal.html?is-external=true" title="java.lang中的类或接口">ThreadLocal</a>&lt;<a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html" title="org.apache.calcite.sql.type中的类">SqlTypeCoercionRule</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html#THREAD_PROVIDERS">THREAD_PROVIDERS</a></span></code>&nbsp;</td>
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<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><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="java.util中的类或接口">Map</a>&lt;<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>,com.google.common.collect.ImmutableSet&lt;<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html#getTypeMapping--">getTypeMapping</a></span>()</code>
<div class="block">Returns the type mappings of this rule instance.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html" title="org.apache.calcite.sql.type中的类">SqlTypeCoercionRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html#instance--">instance</a></span>()</code>
<div class="block">Returns an instance.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html" title="org.apache.calcite.sql.type中的类">SqlTypeCoercionRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html#instance-java.util.Map-">instance</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="java.util中的类或接口">Map</a>&lt;<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>,com.google.common.collect.ImmutableSet&lt;<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>&gt;&gt;&nbsp;map)</code>
<div class="block">Returns an instance with specified type mappings.</div>
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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#equals-java.lang.Object-" title="java.lang中的类或接口">equals</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#hashCode--" title="java.lang中的类或接口">hashCode</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#toString--" title="java.lang中的类或接口">toString</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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<h3>从接口继承的方法&nbsp;org.apache.calcite.sql.type.<a href="../../../../../org/apache/calcite/sql/type/SqlTypeMappingRule.html" title="org.apache.calcite.sql.type中的接口">SqlTypeMappingRule</a></h3>
<code><a href="../../../../../org/apache/calcite/sql/type/SqlTypeMappingRule.html#canApplyFrom-org.apache.calcite.sql.type.SqlTypeName-org.apache.calcite.sql.type.SqlTypeName-">canApplyFrom</a></code></li>
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<h4>THREAD_PROVIDERS</h4>
<pre>public static final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ThreadLocal.html?is-external=true" title="java.lang中的类或接口">ThreadLocal</a>&lt;<a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html" title="org.apache.calcite.sql.type中的类">SqlTypeCoercionRule</a>&gt; THREAD_PROVIDERS</pre>
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<pre>public static&nbsp;<a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html" title="org.apache.calcite.sql.type中的类">SqlTypeCoercionRule</a>&nbsp;instance()</pre>
<div class="block">Returns an instance.</div>
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<pre>public static&nbsp;<a href="../../../../../org/apache/calcite/sql/type/SqlTypeCoercionRule.html" title="org.apache.calcite.sql.type中的类">SqlTypeCoercionRule</a>&nbsp;instance(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="java.util中的类或接口">Map</a>&lt;<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>,com.google.common.collect.ImmutableSet&lt;<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>&gt;&gt;&nbsp;map)</pre>
<div class="block">Returns an instance with specified type mappings.</div>
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<h4>getTypeMapping</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="java.util中的类或接口">Map</a>&lt;<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>,com.google.common.collect.ImmutableSet&lt;<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>&gt;&gt;&nbsp;getTypeMapping()</pre>
<div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/sql/type/SqlTypeMappingRule.html#getTypeMapping--">SqlTypeMappingRule</a></code></span></div>
<div class="block">Returns the type mappings of this rule instance.
<p>The mappings should be immutable.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/sql/type/SqlTypeMappingRule.html#getTypeMapping--">getTypeMapping</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/sql/type/SqlTypeMappingRule.html" title="org.apache.calcite.sql.type中的接口">SqlTypeMappingRule</a></code></dd>
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