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 <h2 title="枚举 RexUnknownAs" class="title">枚举 RexUnknownAs</h2>
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 <pre>public enum <span class="typeNameLabel">RexUnknownAs</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/rex/RexUnknownAs.html" title="org.apache.calcite.rex中的枚举">RexUnknownAs</a>&gt;</pre>
 <div class="block">Policy for whether a simplified expression may instead return another
  value.

  <p>In particular, it deals with converting three-valued logic (TRUE, FALSE,
  UNKNOWN) to two-valued logic (TRUE, FALSE) for callers that treat the UNKNOWN
  value the same as TRUE or FALSE.

  <p>Sometimes the three-valued version of the expression is simpler (has a
  smaller expression tree) than the two-valued version. In these cases,
  favor simplicity over reduction to two-valued logic.</div>
 <dl>
 <dt><span class="seeLabel">另请参阅:</span></dt>
 <dd><a href="../../../../org/apache/calcite/rex/RexSimplify.html" title="org.apache.calcite.rex中的类"><code>RexSimplify</code></a></dd>
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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/rex/RexUnknownAs.html#FALSE">FALSE</a></span></code>
 <div class="block">Policy that indicates that the expression is being used in a context
  Where an UNKNOWN value is treated in the same way as FALSE.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexUnknownAs.html#TRUE">TRUE</a></span></code>
 <div class="block">Policy that indicates that the expression is being used in a context
  Where an UNKNOWN value is treated in the same way as TRUE.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexUnknownAs.html#UNKNOWN">UNKNOWN</a></span></code>
 <div class="block">Policy that indicates that the expression is being used in a context
  Where an UNKNOWN value is treated as is.</div>
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 <td class="colFirst"><code>static <a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="org.apache.calcite.rex中的枚举">RexUnknownAs</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexUnknownAs.html#falseIf-boolean-">falseIf</a></span>(boolean&nbsp;unknownAsFalse)</code>
 <div class="block">Returns <a href="../../../../org/apache/calcite/rex/RexUnknownAs.html#FALSE"><code>FALSE</code></a> if <code>unknownAsFalse</code> is true,
  <a href="../../../../org/apache/calcite/rex/RexUnknownAs.html#UNKNOWN"><code>UNKNOWN</code></a> otherwise.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="org.apache.calcite.rex中的枚举">RexUnknownAs</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexUnknownAs.html#negate--">negate</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexUnknownAs.html#toBoolean--">toBoolean</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>static <a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="org.apache.calcite.rex中的枚举">RexUnknownAs</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexUnknownAs.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="i4" class="altColor">
 <td class="colFirst"><code>static <a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="org.apache.calcite.rex中的枚举">RexUnknownAs</a>[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexUnknownAs.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>
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 <h4>FALSE</h4>
 <pre>public static final&nbsp;<a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="org.apache.calcite.rex中的枚举">RexUnknownAs</a> FALSE</pre>
 <div class="block">Policy that indicates that the expression is being used in a context
  Where an UNKNOWN value is treated in the same way as FALSE. Therefore, when
  simplifying the expression, it is acceptable for the simplified expression
  to evaluate to FALSE in some situations where the original expression would
  evaluate to UNKNOWN.

  <p>SQL predicates (<code>WHERE</code>, <code>ON</code>, <code>HAVING</code> and
  <code>FILTER (WHERE)</code> clauses, a <code>WHEN</code> clause of a <code>CASE</code>
  expression, and in <code>CHECK</code> constraints) all treat UNKNOWN as FALSE.

  <p>If the simplified expression never returns UNKNOWN, the simplifier
  should make this clear to the caller, if possible, by marking its type as
  <code>BOOLEAN NOT NULL</code>.</div>
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 <h4>TRUE</h4>
 <pre>public static final&nbsp;<a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="org.apache.calcite.rex中的枚举">RexUnknownAs</a> TRUE</pre>
 <div class="block">Policy that indicates that the expression is being used in a context
  Where an UNKNOWN value is treated in the same way as TRUE. Therefore, when
  simplifying the expression, it is acceptable for the simplified expression
  to evaluate to TRUE in some situations where the original expression would
  evaluate to UNKNOWN.

  <p>This does not occur commonly in SQL. However, it occurs internally
  during simplification. For example, "<code>WHERE NOT expression</code>"
  evaluates "<code>NOT expression</code>" in a context that treats UNKNOWN as
  FALSE; it is useful to consider that "<code>expression</code>" is evaluated in a
  context that treats UNKNOWN as TRUE.

  <p>If the simplified expression never returns UNKNOWN, the simplifier
  should make this clear to the caller, if possible, by marking its type as
  <code>BOOLEAN NOT NULL</code>.</div>
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 <h4>UNKNOWN</h4>
 <pre>public static final&nbsp;<a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="org.apache.calcite.rex中的枚举">RexUnknownAs</a> UNKNOWN</pre>
 <div class="block">Policy that indicates that the expression is being used in a context
  Where an UNKNOWN value is treated as is. This occurs:

  <ul>
    <li>In any expression whose type is not <code>BOOLEAN</code>
    <li>In <code>BOOLEAN</code> expressions that are <code>NOT NULL</code>
    <li>In <code>BOOLEAN</code> expressions where <code>UNKNOWN</code> should be
        returned as is, for example in a <code>SELECT</code> clause, or within an
        expression such as an operand to <code>AND</code>, <code>OR</code> or
        <code>NOT</code>
  </ul>

  <p>If you are unsure, use UNKNOWN. It is the safest option.</div>
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 <h4>values</h4>
 <pre>public static&nbsp;<a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="org.apache.calcite.rex中的枚举">RexUnknownAs</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 (RexUnknownAs c : RexUnknownAs.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>
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 <h4>valueOf</h4>
 <pre>public static&nbsp;<a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="org.apache.calcite.rex中的枚举">RexUnknownAs</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>
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 <h4>falseIf</h4>
 <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 static&nbsp;<a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="org.apache.calcite.rex中的枚举">RexUnknownAs</a>&nbsp;falseIf(boolean&nbsp;unknownAsFalse)</pre>
 <div class="block">Returns <a href="../../../../org/apache/calcite/rex/RexUnknownAs.html#FALSE"><code>FALSE</code></a> if <code>unknownAsFalse</code> is true,
  <a href="../../../../org/apache/calcite/rex/RexUnknownAs.html#UNKNOWN"><code>UNKNOWN</code></a> otherwise.</div>
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 <h4>toBoolean</h4>
 <pre>public&nbsp;boolean&nbsp;toBoolean()</pre>
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 <h4>negate</h4>
 <pre>public&nbsp;<a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="org.apache.calcite.rex中的枚举">RexUnknownAs</a>&nbsp;negate()</pre>
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