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 <div class="subTitle">org.apache.calcite.rel</div>
 <h2 title="枚举 RelFieldCollation.Direction" class="title">枚举 RelFieldCollation.Direction</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>
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 <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="java.lang中的类或接口">java.lang.Enum</a>&lt;<a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a>&gt;</li>
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 <ul class="inheritance">
 <li>org.apache.calcite.rel.RelFieldCollation.Direction</li>
 </ul>
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 <dt>所有已实现的接口:</dt>
 <dd><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">Serializable</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="java.lang中的类或接口">Comparable</a>&lt;<a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a>&gt;</dd>
 </dl>
 <dl>
 <dt>封闭类:</dt>
 <dd><a href="../../../../org/apache/calcite/rel/RelFieldCollation.html" title="org.apache.calcite.rel中的类">RelFieldCollation</a></dd>
 </dl>
 <hr>
 <br>
 <pre>public static enum <span class="typeNameLabel">RelFieldCollation.Direction</span>
 extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="java.lang中的类或接口">Enum</a>&lt;<a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a>&gt;</pre>
 <div class="block">Direction that a field is ordered in.</div>
 </li>
 </ul>
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 <h3>枚举常量概要</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="枚举常量概要表, 列表枚举常量和解释">
 <caption><span>枚举常量</span><span class="tabEnd">&nbsp;</span></caption>
 <tr>
 <th class="colOne" scope="col">枚举常量和说明</th>
 </tr>
 <tr class="altColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#ASCENDING">ASCENDING</a></span></code>
 <div class="block">Ascending direction: A value is always followed by a greater or equal
  value.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#CLUSTERED">CLUSTERED</a></span></code>
 <div class="block">Clustered direction: Values occur in no particular order, and the
  same value may occur in contiguous groups, but never occurs after
  that.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#DESCENDING">DESCENDING</a></span></code>
 <div class="block">Descending direction: A value is always followed by a lesser or equal
  value.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#STRICTLY_ASCENDING">STRICTLY_ASCENDING</a></span></code>
 <div class="block">Strictly ascending direction: A value is always followed by a greater
  value.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#STRICTLY_DESCENDING">STRICTLY_DESCENDING</a></span></code>
 <div class="block">Strictly descending direction: A value is always followed by a lesser
  value.</div>
 </td>
 </tr>
 </table>
 </li>
 </ul>
 <!-- =========== FIELD SUMMARY =========== -->
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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><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/RelFieldCollation.Direction.html#shortString">shortString</a></span></code>&nbsp;</td>
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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="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><a href="../../../../org/apache/calcite/rel/RelFieldCollation.NullDirection.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.NullDirection</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#defaultNullDirection--">defaultNullDirection</a></span>()</code>
 <div class="block">Returns the null direction if not specified.</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/RelFieldCollation.Direction.html#isDescending--">isDescending</a></span>()</code>
 <div class="block">Returns whether this is <a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#DESCENDING"><code>DESCENDING</code></a> or
  <a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#STRICTLY_DESCENDING"><code>STRICTLY_DESCENDING</code></a>.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code><a href="../../../../org/apache/calcite/sql/validate/SqlMonotonicity.html" title="org.apache.calcite.sql.validate中的枚举">SqlMonotonicity</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#monotonicity--">monotonicity</a></span>()</code>
 <div class="block">Converts the direction to a
  <a href="../../../../org/apache/calcite/sql/validate/SqlMonotonicity.html" title="org.apache.calcite.sql.validate中的枚举"><code>SqlMonotonicity</code></a>.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>static <a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#of-org.apache.calcite.sql.validate.SqlMonotonicity-">of</a></span>(<a href="../../../../org/apache/calcite/sql/validate/SqlMonotonicity.html" title="org.apache.calcite.sql.validate中的枚举">SqlMonotonicity</a>&nbsp;monotonicity)</code>
 <div class="block">Converts a <a href="../../../../org/apache/calcite/sql/validate/SqlMonotonicity.html" title="org.apache.calcite.sql.validate中的枚举"><code>SqlMonotonicity</code></a> to a direction.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>static <a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#valueOf-java.lang.String-">valueOf</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;name)</code>
 <div class="block">返回带有指定名称的该类型的枚举常量。</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>static <a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a>[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#values--">values</a></span>()</code>
 <div class="block">按照声明该枚举类型的常量的顺序, 返回
 包含这些常量的数组。</div>
 </td>
 </tr>
 </table>
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 <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.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/Enum.html?is-external=true#compareTo-E-" title="java.lang中的类或接口">compareTo</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true#equals-java.lang.Object-" title="java.lang中的类或接口">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.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/Enum.html?is-external=true#getDeclaringClass--" title="java.lang中的类或接口">getDeclaringClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true#hashCode--" title="java.lang中的类或接口">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true#name--" title="java.lang中的类或接口">name</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true#ordinal--" title="java.lang中的类或接口">ordinal</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true#toString--" title="java.lang中的类或接口">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true#valueOf-java.lang.Class-java.lang.String-" title="java.lang中的类或接口">valueOf</a></code></li>
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 <code><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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 <h3>枚举常量详细资料</h3>
 <a name="ASCENDING">
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 <pre>public static final&nbsp;<a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a> ASCENDING</pre>
 <div class="block">Ascending direction: A value is always followed by a greater or equal
  value.</div>
 </li>
 </ul>
 <a name="STRICTLY_ASCENDING">
 <!--   -->
 </a>
 <ul class="blockList">
 <li class="blockList">
 <h4>STRICTLY_ASCENDING</h4>
 <pre>public static final&nbsp;<a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a> STRICTLY_ASCENDING</pre>
 <div class="block">Strictly ascending direction: A value is always followed by a greater
  value.</div>
 </li>
 </ul>
 <a name="DESCENDING">
 <!--   -->
 </a>
 <ul class="blockList">
 <li class="blockList">
 <h4>DESCENDING</h4>
 <pre>public static final&nbsp;<a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a> DESCENDING</pre>
 <div class="block">Descending direction: A value is always followed by a lesser or equal
  value.</div>
 </li>
 </ul>
 <a name="STRICTLY_DESCENDING">
 <!--   -->
 </a>
 <ul class="blockList">
 <li class="blockList">
 <h4>STRICTLY_DESCENDING</h4>
 <pre>public static final&nbsp;<a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a> STRICTLY_DESCENDING</pre>
 <div class="block">Strictly descending direction: A value is always followed by a lesser
  value.</div>
 </li>
 </ul>
 <a name="CLUSTERED">
 <!--   -->
 </a>
 <ul class="blockListLast">
 <li class="blockList">
 <h4>CLUSTERED</h4>
 <pre>public static final&nbsp;<a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a> CLUSTERED</pre>
 <div class="block">Clustered direction: Values occur in no particular order, and the
  same value may occur in contiguous groups, but never occurs after
  that. This sort order tends to occur when values are ordered
  according to a hash-key.</div>
 </li>
 </ul>
 </li>
 </ul>
 <!-- ============ FIELD DETAIL =========== -->
 <ul class="blockList">
 <li class="blockList"><a name="field.detail">
 <!--   -->
 </a>
 <h3>字段详细资料</h3>
 <a name="shortString">
 <!--   -->
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 <ul class="blockListLast">
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 <h4>shortString</h4>
 <pre>public final&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> shortString</pre>
 </li>
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 </li>
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 <!-- ============ METHOD DETAIL ========== -->
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 <h3>方法详细资料</h3>
 <a name="values--">
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 <h4>values</h4>
 <pre>public static&nbsp;<a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a>[]&nbsp;values()</pre>
 <div class="block">按照声明该枚举类型的常量的顺序, 返回
 包含这些常量的数组。该方法可用于迭代
 常量, 如下所示:
 <pre>
 for (RelFieldCollation.Direction c : RelFieldCollation.Direction.values())
 &nbsp;   System.out.println(c);
 </pre></div>
 <dl>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>按照声明该枚举类型的常量的顺序返回的包含这些常量的数组</dd>
 </dl>
 </li>
 </ul>
 <a name="valueOf-java.lang.String-">
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 <h4>valueOf</h4>
 <pre>public static&nbsp;<a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a>&nbsp;valueOf(<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;name)</pre>
 <div class="block">返回带有指定名称的该类型的枚举常量。
 字符串必须与用于声明该类型的枚举常量的
 标识符<i>完全</i>匹配。(不允许有多余
 的空格字符。)</div>
 <dl>
 <dt><span class="paramLabel">参数:</span></dt>
 <dd><code>name</code> - 要返回的枚举常量的名称。</dd>
 <dt><span class="returnLabel">返回:</span></dt>
 <dd>返回带有指定名称的枚举常量</dd>
 <dt><span class="throwsLabel">抛出:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="java.lang中的类或接口">IllegalArgumentException</a></code> - 如果该枚举类型没有带有指定名称的常量</dd>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" title="java.lang中的类或接口">NullPointerException</a></code> - 如果参数为空值</dd>
 </dl>
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 <pre>public&nbsp;<a href="../../../../org/apache/calcite/sql/validate/SqlMonotonicity.html" title="org.apache.calcite.sql.validate中的枚举">SqlMonotonicity</a>&nbsp;monotonicity()</pre>
 <div class="block">Converts the direction to a
  <a href="../../../../org/apache/calcite/sql/validate/SqlMonotonicity.html" title="org.apache.calcite.sql.validate中的枚举"><code>SqlMonotonicity</code></a>.</div>
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 <pre>public static&nbsp;<a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.Direction</a>&nbsp;of(<a href="../../../../org/apache/calcite/sql/validate/SqlMonotonicity.html" title="org.apache.calcite.sql.validate中的枚举">SqlMonotonicity</a>&nbsp;monotonicity)</pre>
 <div class="block">Converts a <a href="../../../../org/apache/calcite/sql/validate/SqlMonotonicity.html" title="org.apache.calcite.sql.validate中的枚举"><code>SqlMonotonicity</code></a> to a direction.</div>
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 <pre><a href="https://docs.oracle.com/javase/8/docs/api/javax/annotation/Nonnull.html?is-external=true" title="javax.annotation中的类或接口">@Nonnull</a>
 public&nbsp;<a href="../../../../org/apache/calcite/rel/RelFieldCollation.NullDirection.html" title="org.apache.calcite.rel中的枚举">RelFieldCollation.NullDirection</a>&nbsp;defaultNullDirection()</pre>
 <div class="block">Returns the null direction if not specified. Consistent with Oracle,
  NULLS are sorted as if they were positive infinity.</div>
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 <pre>public&nbsp;boolean&nbsp;isDescending()</pre>
 <div class="block">Returns whether this is <a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#DESCENDING"><code>DESCENDING</code></a> or
  <a href="../../../../org/apache/calcite/rel/RelFieldCollation.Direction.html#STRICTLY_DESCENDING"><code>STRICTLY_DESCENDING</code></a>.</div>
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