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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rex</a></div> |
| <h1 title="Enum RexUnknownAs" class="title">Enum RexUnknownAs</h1> |
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| <div class="inheritance"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang" class="externalLink">java.lang.Enum</a><<a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a>> |
| <div class="inheritance">org.apache.calcite.rex.RexUnknownAs</div> |
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| </div> |
| <section class="description"> |
| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io" class="externalLink">Serializable</a></code>, <code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang" class="externalLink">Comparable</a><<a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a>></code>, <code>java.lang.constant.Constable</code></dd> |
| </dl> |
| <hr> |
| <pre>public enum <span class="typeNameLabel">RexUnknownAs</span> |
| extends <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang" class="externalLink">Enum</a><<a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a>></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">See Also:</span></dt> |
| <dd><a href="RexSimplify.html" title="class in org.apache.calcite.rex"><code>RexSimplify</code></a></dd> |
| </dl> |
| </section> |
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| <h2>Nested classes/interfaces inherited from class java.lang.<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang" class="externalLink">Enum</a></h2> |
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| <caption><span>Enum Constants</span><span class="tabEnd"> </span></caption> |
| <thead> |
| <tr> |
| <th class="colFirst" scope="col">Enum Constant</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#FALSE">FALSE</a></span></code></th> |
| <td class="colLast"> |
| <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"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#TRUE">TRUE</a></span></code></th> |
| <td class="colLast"> |
| <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"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#UNKNOWN">UNKNOWN</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Policy that indicates that the expression is being used in a context |
| Where an UNKNOWN value is treated as is.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
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| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor" id="i0"> |
| <td class="colFirst"><code>static <a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#falseIf(boolean)">falseIf</a></span>​(boolean unknownAsFalse)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns <a href="#FALSE"><code>FALSE</code></a> if <code>unknownAsFalse</code> is true, |
| <a href="#UNKNOWN"><code>UNKNOWN</code></a> otherwise.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i1"> |
| <td class="colFirst"><code><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#negate()">negate</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor" id="i2"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toBoolean()">toBoolean</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor" id="i3"> |
| <td class="colFirst"><code>static <a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#valueOf(java.lang.String)">valueOf</a></span>​(<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> name)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the enum constant of this type with the specified name.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i4"> |
| <td class="colFirst"><code>static <a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a>[]</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#values()">values</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="inheritedList"> |
| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang" class="externalLink">Enum</a></h3> |
| <a id="methods.inherited.from.class.java.lang.Enum"> |
| <!-- --> |
| </a><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#clone()" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#compareTo(E)" title="class or interface in java.lang" class="externalLink">compareTo</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#describeConstable()" title="class or interface in java.lang" class="externalLink">describeConstable</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#getDeclaringClass()" title="class or interface in java.lang" class="externalLink">getDeclaringClass</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#name()" title="class or interface in java.lang" class="externalLink">name</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#ordinal()" title="class or interface in java.lang" class="externalLink">ordinal</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink">toString</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Enum.html?is-external=true#valueOf(java.lang.Class,java.lang.String)" title="class or interface in java.lang" class="externalLink">valueOf</a></code></div> |
| <div class="inheritedList"> |
| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></h3> |
| <a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="blockList"> |
| <!-- ============ ENUM CONSTANT DETAIL =========== --> |
| <li class="blockList"> |
| <section class="constantDetails"><a id="enum.constant.detail"> |
| <!-- --> |
| </a> |
| <h2>Enum Constant Details</h2> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="FALSE">FALSE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></span> <span class="memberName">FALSE</span></div> |
| <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> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="TRUE">TRUE</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></span> <span class="memberName">TRUE</span></div> |
| <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> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="UNKNOWN">UNKNOWN</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static final</span> <span class="returnType"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></span> <span class="memberName">UNKNOWN</span></div> |
| <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> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li class="blockList"> |
| <section class="methodDetails"><a id="method.detail"> |
| <!-- --> |
| </a> |
| <h2>Method Details</h2> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="values()">values</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static</span> <span class="returnType"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a>[]</span> <span class="memberName">values</span>()</div> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an array containing the constants of this enum type, in the order they are declared</dd> |
| </dl> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="valueOf(java.lang.String)">valueOf</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static</span> <span class="returnType"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></span> <span class="memberName">valueOf</span>​(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a> name)</span></div> |
| <div class="block">Returns the enum constant of this type with the specified name. |
| The string must match <i>exactly</i> an identifier used to declare an |
| enum constant in this type. (Extraneous whitespace characters are |
| not permitted.)</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>name</code> - the name of the enum constant to be returned.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the enum constant with the specified name</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if this enum type has no constant with the specified name</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang" class="externalLink">NullPointerException</a></code> - if the argument is null</dd> |
| </dl> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="falseIf(boolean)">falseIf</a></h3> |
| <div class="memberSignature"><span class="annotations"><a href="https://docs.oracle.com/javase/9/docs/api/javax/annotation/Nonnull.html?is-external=true" title="class or interface in javax.annotation" class="externalLink">@Nonnull</a> |
| </span><span class="modifiers">public static</span> <span class="returnType"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></span> <span class="memberName">falseIf</span>​(<span class="arguments">boolean unknownAsFalse)</span></div> |
| <div class="block">Returns <a href="#FALSE"><code>FALSE</code></a> if <code>unknownAsFalse</code> is true, |
| <a href="#UNKNOWN"><code>UNKNOWN</code></a> otherwise.</div> |
| </section> |
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