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<div class="subTitle">org.apache.calcite.rel.type</div>
<h2 title="类 RelDataTypeImpl" class="title">类 RelDataTypeImpl</h2>
</div>
<div class="contentContainer">
<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>org.apache.calcite.rel.type.RelDataTypeImpl</li>
</ul>
</li>
</ul>
<div class="description">
<ul class="blockList">
<li class="blockList">
<dl>
<dt>所有已实现的接口:</dt>
<dd><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>, <a href="../../../../../org/apache/calcite/rel/type/RelDataTypeFamily.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeFamily</a></dd>
</dl>
<dl>
<dt>直接已知子类:</dt>
<dd><a href="../../../../../org/apache/calcite/sql/type/AbstractSqlType.html" title="org.apache.calcite.sql.type中的类">AbstractSqlType</a>, <a href="../../../../../org/apache/calcite/rel/type/DynamicRecordType.html" title="org.apache.calcite.rel.type中的类">DynamicRecordType</a>, <a href="../../../../../org/apache/calcite/rel/type/RelCrossType.html" title="org.apache.calcite.rel.type中的类">RelCrossType</a>, <a href="../../../../../org/apache/calcite/rel/type/RelDataTypeFactoryImpl.JavaType.html" title="org.apache.calcite.rel.type中的类">RelDataTypeFactoryImpl.JavaType</a>, <a href="../../../../../org/apache/calcite/rel/type/RelRecordType.html" title="org.apache.calcite.rel.type中的类">RelRecordType</a></dd>
</dl>
<hr>
<br>
<pre>public abstract class <span class="typeNameLabel">RelDataTypeImpl</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/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>, <a href="../../../../../org/apache/calcite/rel/type/RelDataTypeFamily.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeFamily</a></pre>
<div class="block">RelDataTypeImpl is an abstract base for implementations of
<a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口"><code>RelDataType</code></a>.
<p>Identity is based upon the <a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#digest"><code>digest</code></a> field, which each derived class
should set during construction.</p></div>
</li>
</ul>
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<h3>字段概要</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="字段概要表, 列表字段和解释">
<caption><span>字段</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">限定符和类型</th>
<th class="colLast" scope="col">字段和说明</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected <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/rel/type/RelDataTypeImpl.html#digest">digest</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;<a href="../../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#fieldList">fieldList</a></span></code>&nbsp;</td>
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<h3>从接口继承的字段&nbsp;org.apache.calcite.rel.type.<a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></h3>
<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#PRECISION_NOT_SPECIFIED">PRECISION_NOT_SPECIFIED</a>, <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#SCALE_NOT_SPECIFIED">SCALE_NOT_SPECIFIED</a></code></li>
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<h3>构造器概要</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="构造器概要表, 列表构造器和解释">
<caption><span>构造器</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">限定符</th>
<th class="colLast" scope="col">构造器和说明</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#RelDataTypeImpl--">RelDataTypeImpl</a></span>()</code>
<div class="block">Default constructor, to allow derived classes such as
<a href="../../../../../org/apache/calcite/sql/type/BasicSqlType.html" title="org.apache.calcite.sql.type中的类"><code>BasicSqlType</code></a> to be <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="java.io中的类或接口"><code>Serializable</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#RelDataTypeImpl-java.util.List-">RelDataTypeImpl</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;? extends <a href="../../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;fieldList)</code>
<div class="block">Creates a RelDataTypeImpl.</div>
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<h3>方法概要</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="方法概要表, 列表方法和解释">
<caption><span id="t0" class="activeTableTab"><span>所有方法</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">静态方法</a></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="t3" class="tableTab"><span><a href="javascript:show(4);">抽象方法</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>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#computeDigest--">computeDigest</a></span>()</code>
<div class="block">Computes the digest field.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#equals-java.lang.Object-">equals</a></span>(<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>&nbsp;obj)</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#extra-org.apache.calcite.rel.type.RelDataType-">extra</a></span>(<a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;rowType)</code>
<div class="block">Returns the "extra" field in a row type whose presence signals that
fields will come into existence just by asking for them.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected abstract void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#generateTypeString-java.lang.StringBuilder-boolean-">generateTypeString</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuilder.html?is-external=true" title="java.lang中的类或接口">StringBuilder</a>&nbsp;sb,
boolean&nbsp;withDetail)</code>
<div class="block">Generates a string representation of this type.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/nio/charset/Charset.html?is-external=true" title="java.nio.charset中的类或接口">Charset</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getCharset--">getCharset</a></span>()</code>
<div class="block">Gets this type's character set, or null if this type cannot carry a
character set or has no character set defined.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/sql/SqlCollation.html" title="org.apache.calcite.sql中的类">SqlCollation</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getCollation--">getCollation</a></span>()</code>
<div class="block">Gets this type's collation, or null if this type cannot carry a collation
or has no collation defined.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeComparability.html" title="org.apache.calcite.rel.type中的枚举">RelDataTypeComparability</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getComparability--">getComparability</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i7" 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/rel/type/RelDataTypeImpl.html#getComponentType--">getComponentType</a></span>()</code>
<div class="block">Gets the component type if this type is a collection, otherwise null.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeFamily.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeFamily</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getFamily--">getFamily</a></span>()</code>
<div class="block">Gets a canonical object representing the family of this type.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getField-java.lang.String-boolean-boolean-">getField</a></span>(<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;fieldName,
boolean&nbsp;caseSensitive,
boolean&nbsp;elideRecord)</code>
<div class="block">Looks up a field by name.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getFieldCount--">getFieldCount</a></span>()</code>
<div class="block">Returns the number of fields in a struct type.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;<a href="../../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getFieldList--">getFieldList</a></span>()</code>
<div class="block">Gets the fields in a struct type.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;<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>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getFieldNames--">getFieldNames</a></span>()</code>
<div class="block">Returns the names of the fields in a struct type.</div>
</td>
</tr>
<tr id="i13" 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/rel/type/RelDataTypeImpl.html#getFullTypeString--">getFullTypeString</a></span>()</code>
<div class="block">Gets a string representation of this type with full detail such as
character set and nullability.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/sql/SqlIntervalQualifier.html" title="org.apache.calcite.sql中的类">SqlIntervalQualifier</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getIntervalQualifier--">getIntervalQualifier</a></span>()</code>
<div class="block">Gets this type's interval qualifier, or null if this is not an interval
type.</div>
</td>
</tr>
<tr id="i15" 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/rel/type/RelDataTypeImpl.html#getKeyType--">getKeyType</a></span>()</code>
<div class="block">Gets the key type if this type is a map, otherwise null.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/rel/type/RelDataTypePrecedenceList.html" title="org.apache.calcite.rel.type中的接口">RelDataTypePrecedenceList</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getPrecedenceList--">getPrecedenceList</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getPrecision--">getPrecision</a></span>()</code>
<div class="block">Gets the JDBC-defined precision for values of this type.</div>
</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getScale--">getScale</a></span>()</code>
<div class="block">Gets the scale of this type.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/sql/SqlIdentifier.html" title="org.apache.calcite.sql中的类">SqlIdentifier</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getSqlIdentifier--">getSqlIdentifier</a></span>()</code>
<div class="block">Gets the <a href="../../../../../org/apache/calcite/sql/SqlIdentifier.html" title="org.apache.calcite.sql中的类"><code>SqlIdentifier</code></a> associated with this type.</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getSqlTypeName--">getSqlTypeName</a></span>()</code>
<div class="block">Gets the <a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举"><code>SqlTypeName</code></a> of this type.</div>
</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/calcite/rel/type/StructKind.html" title="org.apache.calcite.rel.type中的枚举">StructKind</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#getStructKind--">getStructKind</a></span>()</code>
<div class="block">Returns the rule for resolving the fields of a structured type,
or <a href="../../../../../org/apache/calcite/rel/type/StructKind.html#NONE"><code>StructKind.NONE</code></a> if this is not a structured type.</div>
</td>
</tr>
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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/rel/type/RelDataTypeImpl.html#getValueType--">getValueType</a></span>()</code>
<div class="block">Gets the value type if this type is a map, otherwise null.</div>
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<tr id="i23" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#hashCode--">hashCode</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#isDynamicStruct--">isDynamicStruct</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#isNullable--">isNullable</a></span>()</code>
<div class="block">Queries whether this type allows null values.</div>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#isStruct--">isStruct</a></span>()</code>
<div class="block">Queries whether this is a structured type.</div>
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<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口">RelProtoDataType</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#proto-org.apache.calcite.rel.type.RelDataType-">proto</a></span>(<a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;protoType)</code>
<div class="block">Returns an implementation of
<a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口"><code>RelProtoDataType</code></a>
that copies a given type using the given type factory.</div>
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<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口">RelProtoDataType</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#proto-org.apache.calcite.sql.type.SqlTypeName-boolean-">proto</a></span>(<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>&nbsp;typeName,
boolean&nbsp;nullable)</code>
<div class="block">Returns a <a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口"><code>RelProtoDataType</code></a>
that will create a type <code>typeName</code>.</div>
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<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口">RelProtoDataType</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#proto-org.apache.calcite.sql.type.SqlTypeName-int-boolean-">proto</a></span>(<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>&nbsp;typeName,
int&nbsp;precision,
boolean&nbsp;nullable)</code>
<div class="block">Returns a <a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口"><code>RelProtoDataType</code></a>
that will create a type <code>typeName(precision)</code>.</div>
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<td class="colFirst"><code>static <a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口">RelProtoDataType</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/calcite/rel/type/RelDataTypeImpl.html#proto-org.apache.calcite.sql.type.SqlTypeName-int-int-boolean-">proto</a></span>(<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>&nbsp;typeName,
int&nbsp;precision,
int&nbsp;scale,
boolean&nbsp;nullable)</code>
<div class="block">Returns a <a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口"><code>RelProtoDataType</code></a>
that will create a type <code>typeName(precision, scale)</code>.</div>
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<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/rel/type/RelDataTypeImpl.html#toString--">toString</a></span>()</code>
<div class="block">Gets a string representation of this type without detail such as
character set and nullability.</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#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>protected final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;<a href="../../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt; fieldList</pre>
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<pre>protected&nbsp;RelDataTypeImpl(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;? extends <a href="../../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;fieldList)</pre>
<div class="block">Creates a RelDataTypeImpl.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>fieldList</code> - List of fields</dd>
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<pre>protected&nbsp;RelDataTypeImpl()</pre>
<div class="block">Default constructor, to allow derived classes such as
<a href="../../../../../org/apache/calcite/sql/type/BasicSqlType.html" title="org.apache.calcite.sql.type中的类"><code>BasicSqlType</code></a> to be <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="java.io中的类或接口"><code>Serializable</code></a>.
<p>(The serialization specification says that a class can be serializable
even if its base class is not serializable, provided that the base class
has a public or protected zero-args constructor.)</div>
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<pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&nbsp;getField(<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;fieldName,
boolean&nbsp;caseSensitive,
boolean&nbsp;elideRecord)</pre>
<div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getField-java.lang.String-boolean-boolean-">RelDataType</a></code></span></div>
<div class="block">Looks up a field by name.
<p>NOTE: Be careful choosing the value of <code>caseSensitive</code>:</p>
<ul>
<li>If the field name was supplied by an end-user (e.g. as a column alias
in SQL), use your session's case-sensitivity setting.</li>
<li>Only hard-code <code>true</code> if you are sure that the field name is
internally generated.</li>
<li>Hard-coding <code>false</code> is almost certainly wrong.</li>
</ul></div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getField-java.lang.String-boolean-boolean-">getField</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>fieldName</code> - Name of field to find</dd>
<dd><code>caseSensitive</code> - Whether match is case-sensitive</dd>
<dd><code>elideRecord</code> - Whether to find fields nested within records</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>named field, or null if not found</dd>
</dl>
</li>
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<h4>getFieldList</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;<a href="../../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&gt;&nbsp;getFieldList()</pre>
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<div class="block">Gets the fields in a struct type. The field count is equal to the size of
the returned list.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getFieldList--">getFieldList</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>read-only list of fields</dd>
</dl>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="java.util中的类或接口">List</a>&lt;<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>&gt;&nbsp;getFieldNames()</pre>
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<div class="block">Returns the names of the fields in a struct type. The field count is
equal to the size of the returned list.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getFieldNames--">getFieldNames</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>read-only list of field names</dd>
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<pre>public&nbsp;int&nbsp;getFieldCount()</pre>
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<div class="block">Returns the number of fields in a struct type.
<p>This method is equivalent to
<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getFieldList--"><code>RelDataType.getFieldList()</code></a>.size()</code>.</div>
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<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getFieldCount--">getFieldCount</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
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<pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/type/StructKind.html" title="org.apache.calcite.rel.type中的枚举">StructKind</a>&nbsp;getStructKind()</pre>
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<div class="block">Returns the rule for resolving the fields of a structured type,
or <a href="../../../../../org/apache/calcite/rel/type/StructKind.html#NONE"><code>StructKind.NONE</code></a> if this is not a structured type.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getStructKind--">getStructKind</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>the StructKind that determines how this type's fields are resolved</dd>
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<a name="getComponentType--">
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<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;getComponentType()</pre>
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<div class="block">Gets the component type if this type is a collection, otherwise null.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getComponentType--">getComponentType</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>canonical type descriptor for components</dd>
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<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;getKeyType()</pre>
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<div class="block">Gets the key type if this type is a map, otherwise null.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getKeyType--">getKeyType</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>canonical type descriptor for key</dd>
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<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;getValueType()</pre>
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<div class="block">Gets the value type if this type is a map, otherwise null.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getValueType--">getValueType</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>canonical type descriptor for value</dd>
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<pre>public&nbsp;boolean&nbsp;isStruct()</pre>
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<div class="block">Queries whether this is a structured type.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#isStruct--">isStruct</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>whether this type has fields; examples include rows and
user-defined structured types in SQL, and classes in Java</dd>
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<pre>public&nbsp;boolean&nbsp;equals(<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>&nbsp;obj)</pre>
<dl>
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<dd><code><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></code>&nbsp;在类中&nbsp;<code><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></code></dd>
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<pre>public&nbsp;int&nbsp;hashCode()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><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></code>&nbsp;在类中&nbsp;<code><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></code></dd>
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<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;getFullTypeString()</pre>
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<div class="block">Gets a string representation of this type with full detail such as
character set and nullability. The string must serve as a "digest" for
this type, meaning two types can be considered identical iff their
digests are equal.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
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<dt><span class="returnLabel">返回:</span></dt>
<dd>full type string</dd>
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<pre>public&nbsp;boolean&nbsp;isNullable()</pre>
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<div class="block">Queries whether this type allows null values.</div>
<dl>
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<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#isNullable--">isNullable</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/charset/Charset.html?is-external=true" title="java.nio.charset中的类或接口">Charset</a>&nbsp;getCharset()</pre>
<div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getCharset--">RelDataType</a></code></span></div>
<div class="block">Gets this type's character set, or null if this type cannot carry a
character set or has no character set defined.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getCharset--">getCharset</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
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<pre>public&nbsp;<a href="../../../../../org/apache/calcite/sql/SqlCollation.html" title="org.apache.calcite.sql中的类">SqlCollation</a>&nbsp;getCollation()</pre>
<div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getCollation--">RelDataType</a></code></span></div>
<div class="block">Gets this type's collation, or null if this type cannot carry a collation
or has no collation defined.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getCollation--">getCollation</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>collation of type</dd>
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<pre>public&nbsp;<a href="../../../../../org/apache/calcite/sql/SqlIntervalQualifier.html" title="org.apache.calcite.sql中的类">SqlIntervalQualifier</a>&nbsp;getIntervalQualifier()</pre>
<div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getIntervalQualifier--">RelDataType</a></code></span></div>
<div class="block">Gets this type's interval qualifier, or null if this is not an interval
type.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getIntervalQualifier--">getIntervalQualifier</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>interval qualifier</dd>
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<pre>public&nbsp;int&nbsp;getPrecision()</pre>
<div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getPrecision--">RelDataType</a></code></span></div>
<div class="block">Gets the JDBC-defined precision for values of this type. Note that this
is not always the same as the user-specified precision. For example, the
type INTEGER has no user-specified precision, but this method returns 10
for an INTEGER type.
<p>Returns <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#PRECISION_NOT_SPECIFIED"><code>RelDataType.PRECISION_NOT_SPECIFIED</code></a> (-1) if precision is not
applicable for this type.</p></div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getPrecision--">getPrecision</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>number of decimal digits for exact numeric types; number of
decimal digits in mantissa for approximate numeric types; number of
decimal digits for fractional seconds of datetime types; length in
characters for character types; length in bytes for binary types; length
in bits for bit types; 1 for BOOLEAN; -1 if precision is not valid for
this type</dd>
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<pre>public&nbsp;int&nbsp;getScale()</pre>
<div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getScale--">RelDataType</a></code></span></div>
<div class="block">Gets the scale of this type. Returns <a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#SCALE_NOT_SPECIFIED"><code>RelDataType.SCALE_NOT_SPECIFIED</code></a> (-1) if
scale is not valid for this type.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getScale--">getScale</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>number of digits of scale</dd>
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<pre>public&nbsp;<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>&nbsp;getSqlTypeName()</pre>
<div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getSqlTypeName--">RelDataType</a></code></span></div>
<div class="block">Gets the <a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举"><code>SqlTypeName</code></a> of this type.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getSqlTypeName--">getSqlTypeName</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>SqlTypeName, or null if this is not an SQL predefined type</dd>
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<pre>public&nbsp;<a href="../../../../../org/apache/calcite/sql/SqlIdentifier.html" title="org.apache.calcite.sql中的类">SqlIdentifier</a>&nbsp;getSqlIdentifier()</pre>
<div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getSqlIdentifier--">RelDataType</a></code></span></div>
<div class="block">Gets the <a href="../../../../../org/apache/calcite/sql/SqlIdentifier.html" title="org.apache.calcite.sql中的类"><code>SqlIdentifier</code></a> associated with this type. For a
predefined type, this is a simple identifier based on
<a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getSqlTypeName--"><code>RelDataType.getSqlTypeName()</code></a>. For a user-defined type, this is a compound
identifier which uniquely names the type.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getSqlIdentifier--">getSqlIdentifier</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>SqlIdentifier, or null if this is not an SQL type</dd>
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<pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/type/RelDataTypeFamily.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeFamily</a>&nbsp;getFamily()</pre>
<div class="block"><span class="descfrmTypeLabel">从接口复制的说明:&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getFamily--">RelDataType</a></code></span></div>
<div class="block">Gets a canonical object representing the family of this type. Two values
can be compared if and only if their types are in the same family.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getFamily--">getFamily</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>canonical object representing type family</dd>
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<pre>protected abstract&nbsp;void&nbsp;generateTypeString(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuilder.html?is-external=true" title="java.lang中的类或接口">StringBuilder</a>&nbsp;sb,
boolean&nbsp;withDetail)</pre>
<div class="block">Generates a string representation of this type.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>sb</code> - StringBuilder into which to generate the string</dd>
<dd><code>withDetail</code> - when true, all detail information needed to compute a
unique digest (and return from getFullTypeString) should
be included;</dd>
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<pre>protected&nbsp;void&nbsp;computeDigest()</pre>
<div class="block">Computes the digest field. This should be called in every non-abstract
subclass constructor once the type is fully defined.</div>
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<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;toString()</pre>
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<div class="block">Gets a string representation of this type without detail such as
character set and nullability.</div>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#toString--">toString</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="overrideSpecifyLabel">覆盖:</span></dt>
<dd><code><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></code>&nbsp;在类中&nbsp;<code><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></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>abbreviated type string</dd>
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<h4>getPrecedenceList</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/type/RelDataTypePrecedenceList.html" title="org.apache.calcite.rel.type中的接口">RelDataTypePrecedenceList</a>&nbsp;getPrecedenceList()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getPrecedenceList--">getPrecedenceList</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>precedence list for this type</dd>
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<pre>public&nbsp;<a href="../../../../../org/apache/calcite/rel/type/RelDataTypeComparability.html" title="org.apache.calcite.rel.type中的枚举">RelDataTypeComparability</a>&nbsp;getComparability()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#getComparability--">getComparability</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>the category of comparison operators which make sense when
applied to values of this type</dd>
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<pre>public static&nbsp;<a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口">RelProtoDataType</a>&nbsp;proto(<a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;protoType)</pre>
<div class="block">Returns an implementation of
<a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口"><code>RelProtoDataType</code></a>
that copies a given type using the given type factory.</div>
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<pre>public static&nbsp;<a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口">RelProtoDataType</a>&nbsp;proto(<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>&nbsp;typeName,
boolean&nbsp;nullable)</pre>
<div class="block">Returns a <a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口"><code>RelProtoDataType</code></a>
that will create a type <code>typeName</code>.
<p>For example, <code>proto(SqlTypeName.DATE), false</code>
will create <code>DATE NOT NULL</code>.</p></div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>typeName</code> - Type name</dd>
<dd><code>nullable</code> - Whether nullable</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>Proto data type</dd>
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<pre>public static&nbsp;<a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口">RelProtoDataType</a>&nbsp;proto(<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>&nbsp;typeName,
int&nbsp;precision,
boolean&nbsp;nullable)</pre>
<div class="block">Returns a <a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口"><code>RelProtoDataType</code></a>
that will create a type <code>typeName(precision)</code>.
<p>For example, <code>proto(SqlTypeName.VARCHAR, 100, false)</code>
will create <code>VARCHAR(100) NOT NULL</code>.</p></div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>typeName</code> - Type name</dd>
<dd><code>precision</code> - Precision</dd>
<dd><code>nullable</code> - Whether nullable</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>Proto data type</dd>
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<pre>public static&nbsp;<a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口">RelProtoDataType</a>&nbsp;proto(<a href="../../../../../org/apache/calcite/sql/type/SqlTypeName.html" title="org.apache.calcite.sql.type中的枚举">SqlTypeName</a>&nbsp;typeName,
int&nbsp;precision,
int&nbsp;scale,
boolean&nbsp;nullable)</pre>
<div class="block">Returns a <a href="../../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口"><code>RelProtoDataType</code></a>
that will create a type <code>typeName(precision, scale)</code>.
<p>For example, <code>proto(SqlTypeName.DECIMAL, 7, 2, false)</code>
will create <code>DECIMAL(7, 2) NOT NULL</code>.</p></div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>typeName</code> - Type name</dd>
<dd><code>precision</code> - Precision</dd>
<dd><code>scale</code> - Scale</dd>
<dd><code>nullable</code> - Whether nullable</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>Proto data type</dd>
</dl>
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<pre>public static&nbsp;<a href="../../../../../org/apache/calcite/rel/type/RelDataTypeField.html" title="org.apache.calcite.rel.type中的接口">RelDataTypeField</a>&nbsp;extra(<a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a>&nbsp;rowType)</pre>
<div class="block">Returns the "extra" field in a row type whose presence signals that
fields will come into existence just by asking for them.</div>
<dl>
<dt><span class="paramLabel">参数:</span></dt>
<dd><code>rowType</code> - Row type</dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>The "extra" field, or null</dd>
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<pre>public&nbsp;boolean&nbsp;isDynamicStruct()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">指定者:</span></dt>
<dd><code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html#isDynamicStruct--">isDynamicStruct</a></code>&nbsp;在接口中&nbsp;<code><a href="../../../../../org/apache/calcite/rel/type/RelDataType.html" title="org.apache.calcite.rel.type中的接口">RelDataType</a></code></dd>
<dt><span class="returnLabel">返回:</span></dt>
<dd>whether it has dynamic structure (for "schema-on-read" table)</dd>
</dl>
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</ul>
</li>
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