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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.calcite.rel.type</a></div>
<h2 title="Class RelDataTypeImpl" class="title">Class RelDataTypeImpl</h2>
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<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>org.apache.calcite.rel.type.RelDataTypeImpl</li>
</ul>
</li>
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code>, <code><a href="RelDataTypeFamily.html" title="interface in org.apache.calcite.rel.type">RelDataTypeFamily</a></code></dd>
</dl>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><code><a href="../../sql/type/AbstractSqlType.html" title="class in org.apache.calcite.sql.type">AbstractSqlType</a></code>, <code><a href="DynamicRecordType.html" title="class in org.apache.calcite.rel.type">DynamicRecordType</a></code>, <code><a href="RelCrossType.html" title="class in org.apache.calcite.rel.type">RelCrossType</a></code>, <code><a href="RelDataTypeFactoryImpl.JavaType.html" title="class in org.apache.calcite.rel.type">RelDataTypeFactoryImpl.JavaType</a></code>, <code><a href="RelRecordType.html" title="class in org.apache.calcite.rel.type">RelRecordType</a></code></dd>
</dl>
<hr>
<pre>public abstract class <span class="typeNameLabel">RelDataTypeImpl</span>
extends java.lang.Object
implements <a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>, <a href="RelDataTypeFamily.html" title="interface in org.apache.calcite.rel.type">RelDataTypeFamily</a></pre>
<div class="block">RelDataTypeImpl is an abstract base for implementations of
<a href="RelDataType.html" title="interface in org.apache.calcite.rel.type"><code>RelDataType</code></a>.
<p>Identity is based upon the <a href="#digest"><code>digest</code></a> field, which each derived class
should set during construction.</p></div>
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<h3>Nested Class Summary</h3>
<table class="memberSummary">
<caption><span>Nested Classes</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private static class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RelDataTypeImpl.Slot.html" title="class in org.apache.calcite.rel.type">RelDataTypeImpl.Slot</a></span></code></th>
<td class="colLast">
<div class="block">Work space for <a href="#getFieldRecurse(java.util.List,org.apache.calcite.rel.type.RelDataType,int,java.lang.String,boolean)"><code>getFieldRecurse(java.util.List&lt;org.apache.calcite.rel.type.RelDataTypeImpl.Slot&gt;, org.apache.calcite.rel.type.RelDataType, int, java.lang.String, boolean)</code></a>.</div>
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<h3>Field Summary</h3>
<table class="memberSummary">
<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Field</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#digest">digest</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected java.util.List&lt;<a href="RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#fieldList">fieldList</a></span></code></th>
<td class="colLast">&nbsp;</td>
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<h3>Fields inherited from interface&nbsp;org.apache.calcite.rel.type.<a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></h3>
<code><a href="RelDataType.html#PRECISION_NOT_SPECIFIED">PRECISION_NOT_SPECIFIED</a>, <a href="RelDataType.html#SCALE_NOT_SPECIFIED">SCALE_NOT_SPECIFIED</a></code></li>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">Modifier</th>
<th class="colSecond" scope="col">Constructor</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected </code></td>
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">RelDataTypeImpl</a></span>()</code></th>
<td class="colLast">
<div class="block">Default constructor, to allow derived classes such as
<a href="../../sql/type/BasicSqlType.html" title="class in org.apache.calcite.sql.type"><code>BasicSqlType</code></a> to be <code>Serializable</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected </code></td>
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.util.List)">RelDataTypeImpl</a></span>&#8203;(java.util.List&lt;? extends <a href="RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&gt;&nbsp;fieldList)</code></th>
<td class="colLast">
<div class="block">Creates a RelDataTypeImpl.</div>
</td>
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<h3>Method Summary</h3>
<table class="memberSummary">
<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#computeDigest()">computeDigest</a></span>()</code></th>
<td class="colLast">
<div class="block">Computes the digest field.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#equals(java.lang.Object)">equals</a></span>&#8203;(java.lang.Object&nbsp;obj)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>static <a href="RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#extra(org.apache.calcite.rel.type.RelDataType)">extra</a></span>&#8203;(<a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;rowType)</code></th>
<td class="colLast">
<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>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#generateTypeString(java.lang.StringBuilder,boolean)">generateTypeString</a></span>&#8203;(java.lang.StringBuilder&nbsp;sb,
boolean&nbsp;withDetail)</code></th>
<td class="colLast">
<div class="block">Generates a string representation of this type.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>java.nio.charset.Charset</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCharset()">getCharset</a></span>()</code></th>
<td class="colLast">
<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="../../sql/SqlCollation.html" title="class in org.apache.calcite.sql">SqlCollation</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCollation()">getCollation</a></span>()</code></th>
<td class="colLast">
<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="RelDataTypeComparability.html" title="enum in org.apache.calcite.rel.type">RelDataTypeComparability</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getComparability()">getComparability</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getComponentType()">getComponentType</a></span>()</code></th>
<td class="colLast">
<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="RelDataTypeFamily.html" title="interface in org.apache.calcite.rel.type">RelDataTypeFamily</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getFamily()">getFamily</a></span>()</code></th>
<td class="colLast">
<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="RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getField(java.lang.String,boolean,boolean)">getField</a></span>&#8203;(java.lang.String&nbsp;fieldName,
boolean&nbsp;caseSensitive,
boolean&nbsp;elideRecord)</code></th>
<td class="colLast">
<div class="block">Looks up a field by name.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getFieldCount()">getFieldCount</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the number of fields in a struct type.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>java.util.List&lt;<a href="RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getFieldList()">getFieldList</a></span>()</code></th>
<td class="colLast">
<div class="block">Gets the fields in a struct type.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>java.util.List&lt;java.lang.String&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getFieldNames()">getFieldNames</a></span>()</code></th>
<td class="colLast">
<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>private static void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getFieldRecurse(java.util.List,org.apache.calcite.rel.type.RelDataType,int,java.lang.String,boolean)">getFieldRecurse</a></span>&#8203;(java.util.List&lt;<a href="RelDataTypeImpl.Slot.html" title="class in org.apache.calcite.rel.type">RelDataTypeImpl.Slot</a>&gt;&nbsp;slots,
<a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type,
int&nbsp;depth,
java.lang.String&nbsp;fieldName,
boolean&nbsp;caseSensitive)</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getFullTypeString()">getFullTypeString</a></span>()</code></th>
<td class="colLast">
<div class="block">Gets a string representation of this type with full detail such as
character set and nullability.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code><a href="../../sql/SqlIntervalQualifier.html" title="class in org.apache.calcite.sql">SqlIntervalQualifier</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getIntervalQualifier()">getIntervalQualifier</a></span>()</code></th>
<td class="colLast">
<div class="block">Gets this type's interval qualifier, or null if this is not an interval
type.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getKeyType()">getKeyType</a></span>()</code></th>
<td class="colLast">
<div class="block">Gets the key type if this type is a map, otherwise null.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code><a href="RelDataTypePrecedenceList.html" title="interface in org.apache.calcite.rel.type">RelDataTypePrecedenceList</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getPrecedenceList()">getPrecedenceList</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getPrecision()">getPrecision</a></span>()</code></th>
<td class="colLast">
<div class="block">Gets the JDBC-defined precision for values of this type.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getScale()">getScale</a></span>()</code></th>
<td class="colLast">
<div class="block">Gets the scale of this type.</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code><a href="../../sql/SqlIdentifier.html" title="class in org.apache.calcite.sql">SqlIdentifier</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSqlIdentifier()">getSqlIdentifier</a></span>()</code></th>
<td class="colLast">
<div class="block">Gets the <a href="../../sql/SqlIdentifier.html" title="class in org.apache.calcite.sql"><code>SqlIdentifier</code></a> associated with this type.</div>
</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code><a href="../../sql/type/SqlTypeName.html" title="enum in org.apache.calcite.sql.type">SqlTypeName</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSqlTypeName()">getSqlTypeName</a></span>()</code></th>
<td class="colLast">
<div class="block">Gets the <a href="../../sql/type/SqlTypeName.html" title="enum in org.apache.calcite.sql.type"><code>SqlTypeName</code></a> of this type.</div>
</td>
</tr>
<tr id="i22" class="altColor">
<td class="colFirst"><code><a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getStructKind()">getStructKind</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the rule for resolving the fields of a structured type,
or <a href="StructKind.html#NONE"><code>StructKind.NONE</code></a> if this is not a structured type.</div>
</td>
</tr>
<tr id="i23" class="rowColor">
<td class="colFirst"><code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getValueType()">getValueType</a></span>()</code></th>
<td class="colLast">
<div class="block">Gets the value type if this type is a map, otherwise null.</div>
</td>
</tr>
<tr id="i24" class="altColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#hashCode()">hashCode</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i25" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isDynamicStruct()">isDynamicStruct</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
</tr>
<tr id="i26" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isNullable()">isNullable</a></span>()</code></th>
<td class="colLast">
<div class="block">Queries whether this type allows null values.</div>
</td>
</tr>
<tr id="i27" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isStruct()">isStruct</a></span>()</code></th>
<td class="colLast">
<div class="block">Queries whether this is a structured type.</div>
</td>
</tr>
<tr id="i28" class="altColor">
<td class="colFirst"><code>static <a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type">RelProtoDataType</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#proto(org.apache.calcite.rel.type.RelDataType)">proto</a></span>&#8203;(<a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;protoType)</code></th>
<td class="colLast">
<div class="block">Returns an implementation of
<a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type"><code>RelProtoDataType</code></a>
that copies a given type using the given type factory.</div>
</td>
</tr>
<tr id="i29" class="rowColor">
<td class="colFirst"><code>static <a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type">RelProtoDataType</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#proto(org.apache.calcite.sql.type.SqlTypeName,boolean)">proto</a></span>&#8203;(<a href="../../sql/type/SqlTypeName.html" title="enum in org.apache.calcite.sql.type">SqlTypeName</a>&nbsp;typeName,
boolean&nbsp;nullable)</code></th>
<td class="colLast">
<div class="block">Returns a <a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type"><code>RelProtoDataType</code></a>
that will create a type <code>typeName</code>.</div>
</td>
</tr>
<tr id="i30" class="altColor">
<td class="colFirst"><code>static <a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type">RelProtoDataType</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#proto(org.apache.calcite.sql.type.SqlTypeName,int,boolean)">proto</a></span>&#8203;(<a href="../../sql/type/SqlTypeName.html" title="enum in org.apache.calcite.sql.type">SqlTypeName</a>&nbsp;typeName,
int&nbsp;precision,
boolean&nbsp;nullable)</code></th>
<td class="colLast">
<div class="block">Returns a <a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type"><code>RelProtoDataType</code></a>
that will create a type <code>typeName(precision)</code>.</div>
</td>
</tr>
<tr id="i31" class="rowColor">
<td class="colFirst"><code>static <a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type">RelProtoDataType</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#proto(org.apache.calcite.sql.type.SqlTypeName,int,int,boolean)">proto</a></span>&#8203;(<a href="../../sql/type/SqlTypeName.html" title="enum in org.apache.calcite.sql.type">SqlTypeName</a>&nbsp;typeName,
int&nbsp;precision,
int&nbsp;scale,
boolean&nbsp;nullable)</code></th>
<td class="colLast">
<div class="block">Returns a <a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type"><code>RelProtoDataType</code></a>
that will create a type <code>typeName(precision, scale)</code>.</div>
</td>
</tr>
<tr id="i32" class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString()">toString</a></span>()</code></th>
<td class="colLast">
<div class="block">Gets a string representation of this type without detail such as
character set and nullability.</div>
</td>
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</table>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, finalize, getClass, notify, notifyAll, wait, wait, wait</code></li>
</ul>
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</ul>
</section>
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<!-- ============ FIELD DETAIL =========== -->
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<h3>Field Detail</h3>
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<h4>fieldList</h4>
<pre>protected final&nbsp;java.util.List&lt;<a href="RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&gt; fieldList</pre>
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<pre>protected&nbsp;java.lang.String digest</pre>
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<h4>RelDataTypeImpl</h4>
<pre>protected&nbsp;RelDataTypeImpl&#8203;(java.util.List&lt;? extends <a href="RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&gt;&nbsp;fieldList)</pre>
<div class="block">Creates a RelDataTypeImpl.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fieldList</code> - List of fields</dd>
</dl>
</li>
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<h4>RelDataTypeImpl</h4>
<pre>protected&nbsp;RelDataTypeImpl()</pre>
<div class="block">Default constructor, to allow derived classes such as
<a href="../../sql/type/BasicSqlType.html" title="class in org.apache.calcite.sql.type"><code>BasicSqlType</code></a> to be <code>Serializable</code>.
<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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<h4>getField</h4>
<pre class="methodSignature">public&nbsp;<a href="RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&nbsp;getField&#8203;(java.lang.String&nbsp;fieldName,
boolean&nbsp;caseSensitive,
boolean&nbsp;elideRecord)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="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">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getField(java.lang.String,boolean,boolean)">getField</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="paramLabel">Parameters:</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">Returns:</span></dt>
<dd>named field, or null if not found</dd>
</dl>
</li>
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<h4>getFieldRecurse</h4>
<pre class="methodSignature">private static&nbsp;void&nbsp;getFieldRecurse&#8203;(java.util.List&lt;<a href="RelDataTypeImpl.Slot.html" title="class in org.apache.calcite.rel.type">RelDataTypeImpl.Slot</a>&gt;&nbsp;slots,
<a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;type,
int&nbsp;depth,
java.lang.String&nbsp;fieldName,
boolean&nbsp;caseSensitive)</pre>
</li>
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<h4>getFieldList</h4>
<pre class="methodSignature">public&nbsp;java.util.List&lt;<a href="RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&gt;&nbsp;getFieldList()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#getFieldList()">RelDataType</a></code></span></div>
<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">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getFieldList()">getFieldList</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>read-only list of fields</dd>
</dl>
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<h4>getFieldNames</h4>
<pre class="methodSignature">public&nbsp;java.util.List&lt;java.lang.String&gt;&nbsp;getFieldNames()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#getFieldNames()">RelDataType</a></code></span></div>
<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">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getFieldNames()">getFieldNames</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>read-only list of field names</dd>
</dl>
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<pre class="methodSignature">public&nbsp;int&nbsp;getFieldCount()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#getFieldCount()">RelDataType</a></code></span></div>
<div class="block">Returns the number of fields in a struct type.
<p>This method is equivalent to
<code><a href="RelDataType.html#getFieldList()"><code>RelDataType.getFieldList()</code></a>.size()</code>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getFieldCount()">getFieldCount</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
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<h4>getStructKind</h4>
<pre class="methodSignature">public&nbsp;<a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a>&nbsp;getStructKind()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#getStructKind()">RelDataType</a></code></span></div>
<div class="block">Returns the rule for resolving the fields of a structured type,
or <a href="StructKind.html#NONE"><code>StructKind.NONE</code></a> if this is not a structured type.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getStructKind()">getStructKind</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the StructKind that determines how this type's fields are resolved</dd>
</dl>
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<h4>getComponentType</h4>
<pre class="methodSignature">public&nbsp;<a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;getComponentType()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#getComponentType()">RelDataType</a></code></span></div>
<div class="block">Gets the component type if this type is a collection, otherwise null.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getComponentType()">getComponentType</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>canonical type descriptor for components</dd>
</dl>
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<h4>getKeyType</h4>
<pre class="methodSignature">public&nbsp;<a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;getKeyType()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#getKeyType()">RelDataType</a></code></span></div>
<div class="block">Gets the key type if this type is a map, otherwise null.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getKeyType()">getKeyType</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>canonical type descriptor for key</dd>
</dl>
</li>
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<a id="getValueType()">
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<h4>getValueType</h4>
<pre class="methodSignature">public&nbsp;<a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;getValueType()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#getValueType()">RelDataType</a></code></span></div>
<div class="block">Gets the value type if this type is a map, otherwise null.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getValueType()">getValueType</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>canonical type descriptor for value</dd>
</dl>
</li>
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<h4>isStruct</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;isStruct()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#isStruct()">RelDataType</a></code></span></div>
<div class="block">Queries whether this is a structured type.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#isStruct()">isStruct</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether this type has fields; examples include rows and
user-defined structured types in SQL, and classes in Java</dd>
</dl>
</li>
</ul>
<a id="equals(java.lang.Object)">
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<h4>equals</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;equals&#8203;(java.lang.Object&nbsp;obj)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>equals</code>&nbsp;in class&nbsp;<code>java.lang.Object</code></dd>
</dl>
</li>
</ul>
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<h4>hashCode</h4>
<pre class="methodSignature">public&nbsp;int&nbsp;hashCode()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>hashCode</code>&nbsp;in class&nbsp;<code>java.lang.Object</code></dd>
</dl>
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<h4>getFullTypeString</h4>
<pre class="methodSignature">public&nbsp;java.lang.String&nbsp;getFullTypeString()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#getFullTypeString()">RelDataType</a></code></span></div>
<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">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getFullTypeString()">getFullTypeString</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>full type string</dd>
</dl>
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<h4>isNullable</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;isNullable()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#isNullable()">RelDataType</a></code></span></div>
<div class="block">Queries whether this type allows null values.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#isNullable()">isNullable</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether type allows null values</dd>
</dl>
</li>
</ul>
<a id="getCharset()">
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<h4>getCharset</h4>
<pre class="methodSignature">public&nbsp;java.nio.charset.Charset&nbsp;getCharset()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="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">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getCharset()">getCharset</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>charset of type</dd>
</dl>
</li>
</ul>
<a id="getCollation()">
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<h4>getCollation</h4>
<pre class="methodSignature">public&nbsp;<a href="../../sql/SqlCollation.html" title="class in org.apache.calcite.sql">SqlCollation</a>&nbsp;getCollation()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="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">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getCollation()">getCollation</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>collation of type</dd>
</dl>
</li>
</ul>
<a id="getIntervalQualifier()">
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<h4>getIntervalQualifier</h4>
<pre class="methodSignature">public&nbsp;<a href="../../sql/SqlIntervalQualifier.html" title="class in org.apache.calcite.sql">SqlIntervalQualifier</a>&nbsp;getIntervalQualifier()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="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">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getIntervalQualifier()">getIntervalQualifier</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>interval qualifier</dd>
</dl>
</li>
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<a id="getPrecision()">
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<h4>getPrecision</h4>
<pre class="methodSignature">public&nbsp;int&nbsp;getPrecision()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="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="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">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getPrecision()">getPrecision</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</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>
</dl>
</li>
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<h4>getScale</h4>
<pre class="methodSignature">public&nbsp;int&nbsp;getScale()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#getScale()">RelDataType</a></code></span></div>
<div class="block">Gets the scale of this type. Returns <a href="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">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getScale()">getScale</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>number of digits of scale</dd>
</dl>
</li>
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<a id="getSqlTypeName()">
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<h4>getSqlTypeName</h4>
<pre class="methodSignature">public&nbsp;<a href="../../sql/type/SqlTypeName.html" title="enum in org.apache.calcite.sql.type">SqlTypeName</a>&nbsp;getSqlTypeName()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#getSqlTypeName()">RelDataType</a></code></span></div>
<div class="block">Gets the <a href="../../sql/type/SqlTypeName.html" title="enum in org.apache.calcite.sql.type"><code>SqlTypeName</code></a> of this type.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getSqlTypeName()">getSqlTypeName</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>SqlTypeName, or null if this is not an SQL predefined type</dd>
</dl>
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<a id="getSqlIdentifier()">
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<h4>getSqlIdentifier</h4>
<pre class="methodSignature">public&nbsp;<a href="../../sql/SqlIdentifier.html" title="class in org.apache.calcite.sql">SqlIdentifier</a>&nbsp;getSqlIdentifier()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#getSqlIdentifier()">RelDataType</a></code></span></div>
<div class="block">Gets the <a href="../../sql/SqlIdentifier.html" title="class in org.apache.calcite.sql"><code>SqlIdentifier</code></a> associated with this type. For a
predefined type, this is a simple identifier based on
<a href="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">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getSqlIdentifier()">getSqlIdentifier</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>SqlIdentifier, or null if this is not an SQL type</dd>
</dl>
</li>
</ul>
<a id="getFamily()">
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<h4>getFamily</h4>
<pre class="methodSignature">public&nbsp;<a href="RelDataTypeFamily.html" title="interface in org.apache.calcite.rel.type">RelDataTypeFamily</a>&nbsp;getFamily()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="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">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getFamily()">getFamily</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>canonical object representing type family</dd>
</dl>
</li>
</ul>
<a id="generateTypeString(java.lang.StringBuilder,boolean)">
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<h4>generateTypeString</h4>
<pre class="methodSignature">protected abstract&nbsp;void&nbsp;generateTypeString&#8203;(java.lang.StringBuilder&nbsp;sb,
boolean&nbsp;withDetail)</pre>
<div class="block">Generates a string representation of this type.</div>
<dl>
<dt><span class="paramLabel">Parameters:</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>
</dl>
</li>
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<a id="computeDigest()">
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<h4>computeDigest</h4>
<pre class="methodSignature">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>
</li>
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<a id="toString()">
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<h4>toString</h4>
<pre class="methodSignature">public&nbsp;java.lang.String&nbsp;toString()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="RelDataType.html#toString()">RelDataType</a></code></span></div>
<div class="block">Gets a string representation of this type without detail such as
character set and nullability.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#toString()">toString</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>toString</code>&nbsp;in class&nbsp;<code>java.lang.Object</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>abbreviated type string</dd>
</dl>
</li>
</ul>
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<h4>getPrecedenceList</h4>
<pre class="methodSignature">public&nbsp;<a href="RelDataTypePrecedenceList.html" title="interface in org.apache.calcite.rel.type">RelDataTypePrecedenceList</a>&nbsp;getPrecedenceList()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getPrecedenceList()">getPrecedenceList</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>precedence list for this type</dd>
</dl>
</li>
</ul>
<a id="getComparability()">
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<h4>getComparability</h4>
<pre class="methodSignature">public&nbsp;<a href="RelDataTypeComparability.html" title="enum in org.apache.calcite.rel.type">RelDataTypeComparability</a>&nbsp;getComparability()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#getComparability()">getComparability</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the category of comparison operators which make sense when
applied to values of this type</dd>
</dl>
</li>
</ul>
<a id="proto(org.apache.calcite.rel.type.RelDataType)">
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<h4>proto</h4>
<pre class="methodSignature">public static&nbsp;<a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type">RelProtoDataType</a>&nbsp;proto&#8203;(<a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a>&nbsp;protoType)</pre>
<div class="block">Returns an implementation of
<a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type"><code>RelProtoDataType</code></a>
that copies a given type using the given type factory.</div>
</li>
</ul>
<a id="proto(org.apache.calcite.sql.type.SqlTypeName,boolean)">
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<h4>proto</h4>
<pre class="methodSignature">public static&nbsp;<a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type">RelProtoDataType</a>&nbsp;proto&#8203;(<a href="../../sql/type/SqlTypeName.html" title="enum in org.apache.calcite.sql.type">SqlTypeName</a>&nbsp;typeName,
boolean&nbsp;nullable)</pre>
<div class="block">Returns a <a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type"><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">Parameters:</span></dt>
<dd><code>typeName</code> - Type name</dd>
<dd><code>nullable</code> - Whether nullable</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Proto data type</dd>
</dl>
</li>
</ul>
<a id="proto(org.apache.calcite.sql.type.SqlTypeName,int,boolean)">
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<h4>proto</h4>
<pre class="methodSignature">public static&nbsp;<a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type">RelProtoDataType</a>&nbsp;proto&#8203;(<a href="../../sql/type/SqlTypeName.html" title="enum in org.apache.calcite.sql.type">SqlTypeName</a>&nbsp;typeName,
int&nbsp;precision,
boolean&nbsp;nullable)</pre>
<div class="block">Returns a <a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type"><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">Parameters:</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">Returns:</span></dt>
<dd>Proto data type</dd>
</dl>
</li>
</ul>
<a id="proto(org.apache.calcite.sql.type.SqlTypeName,int,int,boolean)">
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<h4>proto</h4>
<pre class="methodSignature">public static&nbsp;<a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type">RelProtoDataType</a>&nbsp;proto&#8203;(<a href="../../sql/type/SqlTypeName.html" title="enum in org.apache.calcite.sql.type">SqlTypeName</a>&nbsp;typeName,
int&nbsp;precision,
int&nbsp;scale,
boolean&nbsp;nullable)</pre>
<div class="block">Returns a <a href="RelProtoDataType.html" title="interface in org.apache.calcite.rel.type"><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">Parameters:</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">Returns:</span></dt>
<dd>Proto data type</dd>
</dl>
</li>
</ul>
<a id="extra(org.apache.calcite.rel.type.RelDataType)">
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<h4>extra</h4>
<pre class="methodSignature">public static&nbsp;<a href="RelDataTypeField.html" title="interface in org.apache.calcite.rel.type">RelDataTypeField</a>&nbsp;extra&#8203;(<a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">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">Parameters:</span></dt>
<dd><code>rowType</code> - Row type</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The "extra" field, or null</dd>
</dl>
</li>
</ul>
<a id="isDynamicStruct()">
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<ul class="blockListLast">
<li class="blockList">
<h4>isDynamicStruct</h4>
<pre class="methodSignature">public&nbsp;boolean&nbsp;isDynamicStruct()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="RelDataType.html#isDynamicStruct()">isDynamicStruct</a></code>&nbsp;in interface&nbsp;<code><a href="RelDataType.html" title="interface in org.apache.calcite.rel.type">RelDataType</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether it has dynamic structure (for "schema-on-read" table)</dd>
</dl>
</li>
</ul>
</li>
</ul>
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