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| <li>Summary: </li> |
| <li><a href="#nested-class-summary">Nested</a> | </li> |
| <li><a href="#enum-constant-summary">Enum Constants</a> | </li> |
| <li>Field | </li> |
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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.calcite.rex</a></div> |
| <h1 title="Enum RexUnknownAs" class="title">Enum RexUnknownAs</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html" title="class or interface in java.lang" class="external-link">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> |
| </div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <dl class="notes"> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/Serializable.html" title="class or interface in java.io" class="external-link">Serializable</a></code>, <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Comparable.html" title="class or interface in java.lang" class="external-link">Comparable</a><<a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a>></code>, <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/constant/Constable.html" title="class or interface in java.lang.constant" class="external-link">Constable</a></code></dd> |
| </dl> |
| <hr> |
| <div class="type-signature"><span class="modifiers">public enum </span><span class="element-name type-name-label">RexUnknownAs</span> |
| <span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html" title="class or interface in java.lang" class="external-link">Enum</a><<a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a>></span></div> |
| <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 class="notes"> |
| <dt>See Also:</dt> |
| <dd> |
| <ul class="see-list"> |
| <li><a href="RexSimplify.html" title="class in org.apache.calcite.rex"><code>RexSimplify</code></a></li> |
| </ul> |
| </dd> |
| </dl> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ======== NESTED CLASS SUMMARY ======== --> |
| <li> |
| <section class="nested-class-summary" id="nested-class-summary"> |
| <h2>Nested Class Summary</h2> |
| <div class="inherited-list"> |
| <h2 id="nested-classes-inherited-from-class-java.lang.Enum">Nested classes/interfaces inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html" title="class or interface in java.lang" class="external-link">Enum</a></h2> |
| <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.EnumDesc.html" title="class or interface in java.lang" class="external-link">Enum.EnumDesc</a><<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.EnumDesc.html" title="class or interface in java.lang" class="external-link">E</a> extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html" title="class or interface in java.lang" class="external-link">Enum</a><<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.EnumDesc.html" title="class or interface in java.lang" class="external-link">E</a>>></code></div> |
| </section> |
| </li> |
| <!-- =========== ENUM CONSTANT SUMMARY =========== --> |
| <li> |
| <section class="constants-summary" id="enum-constant-summary"> |
| <h2>Enum Constant Summary</h2> |
| <div class="caption"><span>Enum Constants</span></div> |
| <div class="summary-table two-column-summary"> |
| <div class="table-header col-first">Enum Constant</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color"><code><a href="#FALSE" class="member-name-link">FALSE</a></code></div> |
| <div class="col-last even-row-color"> |
| <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> |
| </div> |
| <div class="col-first odd-row-color"><code><a href="#TRUE" class="member-name-link">TRUE</a></code></div> |
| <div class="col-last odd-row-color"> |
| <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> |
| </div> |
| <div class="col-first even-row-color"><code><a href="#UNKNOWN" class="member-name-link">UNKNOWN</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Policy that indicates that the expression is being used in a context |
| Where an UNKNOWN value is treated as is.</div> |
| </div> |
| </div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
| <div id="method-summary-table"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div> |
| <div id="method-summary-table.tabpanel" role="tabpanel"> |
| <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#falseIf(boolean)" class="member-name-link">falseIf</a><wbr>(boolean unknownAsFalse)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <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> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#negate()" class="member-name-link">negate</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#or(org.apache.calcite.rex.RexUnknownAs)" class="member-name-link">or</a><wbr>(<a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a> other)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Combines this with another <code>RexUnknownAs</code> in the same way as the |
| three-valued logic of OR.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#toBoolean()" class="member-name-link">toBoolean</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#valueOf(java.lang.String)" class="member-name-link">valueOf</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a> name)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Returns the enum constant of this type with the specified name.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a>[]</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#values()" class="member-name-link">values</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Enum">Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html" title="class or interface in java.lang" class="external-link">Enum</a></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html#compareTo(E)" title="class or interface in java.lang" class="external-link">compareTo</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html#describeConstable()" title="class or interface in java.lang" class="external-link">describeConstable</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html#getDeclaringClass()" title="class or interface in java.lang" class="external-link">getDeclaringClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html#name()" title="class or interface in java.lang" class="external-link">name</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html#ordinal()" title="class or interface in java.lang" class="external-link">ordinal</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Enum.html#valueOf(java.lang.Class,java.lang.String)" title="class or interface in java.lang" class="external-link">valueOf</a></code></div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ ENUM CONSTANT DETAIL =========== --> |
| <li> |
| <section class="constant-details" id="enum-constant-detail"> |
| <h2>Enum Constant Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="FALSE"> |
| <h3>FALSE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></span> <span class="element-name">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> |
| <section class="detail" id="TRUE"> |
| <h3>TRUE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></span> <span class="element-name">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> |
| <section class="detail" id="UNKNOWN"> |
| <h3>UNKNOWN</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></span> <span class="element-name">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> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="values()"> |
| <h3>values</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a>[]</span> <span class="element-name">values</span>()</div> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>an array containing the constants of this enum type, in the order they are declared</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="valueOf(java.lang.String)"> |
| <h3>valueOf</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></span> <span class="element-name">valueOf</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">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 class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>name</code> - the name of the enum constant to be returned.</dd> |
| <dt>Returns:</dt> |
| <dd>the enum constant with the specified name</dd> |
| <dt>Throws:</dt> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if this enum type has no constant with the specified name</dd> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/NullPointerException.html" title="class or interface in java.lang" class="external-link">NullPointerException</a></code> - if the argument is null</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="falseIf(boolean)"> |
| <h3>falseIf</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></span> <span class="element-name">falseIf</span><wbr><span class="parameters">(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> |
| </li> |
| <li> |
| <section class="detail" id="toBoolean()"> |
| <h3>toBoolean</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">boolean</span> <span class="element-name">toBoolean</span>()</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="negate()"> |
| <h3>negate</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></span> <span class="element-name">negate</span>()</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="or(org.apache.calcite.rex.RexUnknownAs)"> |
| <h3>or</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a></span> <span class="element-name">or</span><wbr><span class="parameters">(<a href="RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a> other)</span></div> |
| <div class="block">Combines this with another <code>RexUnknownAs</code> in the same way as the |
| three-valued logic of OR. |
| |
| <p>For example, <code>TRUE or FALSE</code> returns <code>TRUE</code>; |
| <code>FALSE or UNKNOWN</code> returns <code>UNKNOWN</code>.</div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </section> |
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