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| <div class="aboutLanguage"><b>Apache Calcite</b></div> |
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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.plan</a></div> |
| <h1 title="Class Strong" class="title">Class Strong</h1> |
| </div> |
| <div class="contentContainer"> |
| <div class="inheritance" title="Inheritance Tree"><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">java.lang.Object</a> |
| <div class="inheritance">org.apache.calcite.plan.Strong</div> |
| </div> |
| <section class="description"> |
| <hr> |
| <pre>public class <span class="typeNameLabel">Strong</span> |
| extends <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></pre> |
| <div class="block">Utilities for strong predicates. |
| |
| <p>A predicate is strong (or null-rejecting) if it is UNKNOWN if any of its |
| inputs is UNKNOWN.</p> |
| |
| <p>By the way, UNKNOWN is just the boolean form of NULL.</p> |
| |
| <p>Examples:</p> |
| <ul> |
| <li><code>UNKNOWN</code> is strong in [] (definitely null) |
| <li><code>c = 1</code> is strong in [c] (definitely null if and only if c is |
| null) |
| <li><code>c IS NULL</code> is not strong (always returns TRUE or FALSE, never |
| null) |
| <li><code>p1 AND p2</code> is strong in [p1, p2] (definitely null if either p1 |
| is null or p2 is null) |
| <li><code>p1 OR p2</code> is strong if p1 and p2 are strong |
| <li><code>c1 = 1 OR c2 IS NULL</code> is strong in [c1] (definitely null if c1 |
| is null) |
| </ul></div> |
| </section> |
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| <!-- ======== NESTED CLASS SUMMARY ======== --> |
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| <thead> |
| <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> |
| </thead> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="Strong.Policy.html" title="enum in org.apache.calcite.plan">Strong.Policy</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">How whether an operator's operands are null affects whether a call to |
| that operator evaluates to null.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </section> |
| </li> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <li class="blockList"> |
| <section class="constructorSummary"><a id="constructor.summary"> |
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| <h2>Constructor Summary</h2> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <thead> |
| <tr> |
| <th class="colFirst" scope="col">Constructor</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">Strong</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| </tbody> |
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| </section> |
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| <h2>Method Summary</h2> |
| <div class="memberSummary"> |
| <div role="tablist" aria-orientation="horizontal"><button role="tab" aria-selected="true" aria-controls="memberSummary_tabpanel" tabindex="0" onkeydown="switchTab(event)" id="t0" class="activeTableTab">All Methods</button><button role="tab" aria-selected="false" aria-controls="memberSummary_tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t1" class="tableTab" onclick="show(1);">Static Methods</button><button role="tab" aria-selected="false" aria-controls="memberSummary_tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t2" class="tableTab" onclick="show(2);">Instance Methods</button><button role="tab" aria-selected="false" aria-controls="memberSummary_tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t4" class="tableTab" onclick="show(8);">Concrete Methods</button><button role="tab" aria-selected="false" aria-controls="memberSummary_tabpanel" tabindex="-1" onkeydown="switchTab(event)" id="t6" class="tableTab" onclick="show(32);">Deprecated Methods</button></div> |
| <div id="memberSummary_tabpanel" role="tabpanel"> |
| <table aria-labelledby="t0"> |
| <thead> |
| <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> |
| </thead> |
| <tbody> |
| <tr class="altColor" id="i0"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#allStrong(java.util.List)">allStrong</a></span>​(<a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a><<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns whether all expressions in a list are strong.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i1"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isNotTrue(org.apache.calcite.rex.RexNode)">isNotTrue</a></span>​(<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> node)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns whether an expression is definitely not true.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i2"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isNotTrue(org.apache.calcite.rex.RexNode,org.apache.calcite.util.ImmutableBitSet)">isNotTrue</a></span>​(<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> node, |
| <a href="../util/ImmutableBitSet.html" title="class in org.apache.calcite.util">ImmutableBitSet</a> nullColumns)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns whether the analyzed expression will definitely not return true |
| (equivalently, will definitely not return null or false) if |
| all of a given set of input columns are null.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i3"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isNull(org.apache.calcite.rex.RexInputRef)">isNull</a></span>​(<a href="../rex/RexInputRef.html" title="class in org.apache.calcite.rex">RexInputRef</a> ref)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns whether a given input is definitely null.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i4"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isNull(org.apache.calcite.rex.RexNode)">isNull</a></span>​(<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> node)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns whether an expression is definitely null.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i5"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isNull(org.apache.calcite.rex.RexNode,org.apache.calcite.util.ImmutableBitSet)">isNull</a></span>​(<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> node, |
| <a href="../util/ImmutableBitSet.html" title="class in org.apache.calcite.util">ImmutableBitSet</a> nullColumns)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns whether the analyzed expression will definitely return null if |
| all of a given set of input columns are null.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i6"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isStrong(org.apache.calcite.rex.RexNode)">isStrong</a></span>​(<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> e)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns whether a given expression is strong.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i7"> |
| <td class="colFirst"><code>static <a href="Strong.html" title="class in org.apache.calcite.plan">Strong</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#of(org.apache.calcite.util.ImmutableBitSet)">of</a></span>​(<a href="../util/ImmutableBitSet.html" title="class in org.apache.calcite.util">ImmutableBitSet</a> nullColumns)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns a checker that consults a bit set to find out whether particular |
| inputs may be null.</div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i8"> |
| <td class="colFirst"><code>static <a href="Strong.Policy.html" title="enum in org.apache.calcite.plan">Strong.Policy</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#policy(org.apache.calcite.rex.RexNode)">policy</a></span>​(<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> rexNode)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns how to deduce whether a particular <a href="../rex/RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> expression is null, |
| given whether its arguments are null.</div> |
| </td> |
| </tr> |
| <tr class="rowColor" id="i9"> |
| <td class="colFirst"><code>static <a href="Strong.Policy.html" title="enum in org.apache.calcite.plan">Strong.Policy</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#policy(org.apache.calcite.sql.SqlKind)">policy</a></span>​(<a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a> kind)</code></th> |
| <td class="colLast"> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="deprecationComment">Use <a href="#policy(org.apache.calcite.rex.RexNode)"><code>policy(RexNode)</code></a> or <a href="#policy(org.apache.calcite.sql.SqlOperator)"><code>policy(SqlOperator)</code></a></div> |
| </div> |
| </td> |
| </tr> |
| <tr class="altColor" id="i10"> |
| <td class="colFirst"><code>static <a href="Strong.Policy.html" title="enum in org.apache.calcite.plan">Strong.Policy</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#policy(org.apache.calcite.sql.SqlOperator)">policy</a></span>​(<a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> operator)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns how to deduce whether a particular <a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql"><code>SqlOperator</code></a> expression is null, |
| given whether its arguments are null.</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/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#clone()" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Object.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/Object.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/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#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</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#toString()" title="class or interface in java.lang" class="externalLink">toString</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"> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <li class="blockList"> |
| <section class="constructorDetails"><a id="constructor.detail"> |
| <!-- --> |
| </a> |
| <h2>Constructor Details</h2> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="<init>()">Strong</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="memberName">Strong</span>()</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="of(org.apache.calcite.util.ImmutableBitSet)">of</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static</span> <span class="returnType"><a href="Strong.html" title="class in org.apache.calcite.plan">Strong</a></span> <span class="memberName">of</span>​(<span class="arguments"><a href="../util/ImmutableBitSet.html" title="class in org.apache.calcite.util">ImmutableBitSet</a> nullColumns)</span></div> |
| <div class="block">Returns a checker that consults a bit set to find out whether particular |
| inputs may be null.</div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="isNull(org.apache.calcite.rex.RexNode,org.apache.calcite.util.ImmutableBitSet)">isNull</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static</span> <span class="returnType">boolean</span> <span class="memberName">isNull</span>​(<span class="arguments"><a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> node, |
| <a href="../util/ImmutableBitSet.html" title="class in org.apache.calcite.util">ImmutableBitSet</a> nullColumns)</span></div> |
| <div class="block">Returns whether the analyzed expression will definitely return null if |
| all of a given set of input columns are null.</div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="isNotTrue(org.apache.calcite.rex.RexNode,org.apache.calcite.util.ImmutableBitSet)">isNotTrue</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static</span> <span class="returnType">boolean</span> <span class="memberName">isNotTrue</span>​(<span class="arguments"><a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> node, |
| <a href="../util/ImmutableBitSet.html" title="class in org.apache.calcite.util">ImmutableBitSet</a> nullColumns)</span></div> |
| <div class="block">Returns whether the analyzed expression will definitely not return true |
| (equivalently, will definitely not return null or false) if |
| all of a given set of input columns are null.</div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="policy(org.apache.calcite.sql.SqlKind)">policy</a></h3> |
| <div class="memberSignature"><span class="annotations"><a href="https://docs.oracle.com/javase/9/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang" class="externalLink">@Deprecated</a> |
| </span><span class="modifiers">public static</span> <span class="returnType"><a href="Strong.Policy.html" title="enum in org.apache.calcite.plan">Strong.Policy</a></span> <span class="memberName">policy</span>​(<span class="arguments"><a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a> kind)</span></div> |
| <div class="deprecationBlock"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="deprecationComment">Use <a href="#policy(org.apache.calcite.rex.RexNode)"><code>policy(RexNode)</code></a> or <a href="#policy(org.apache.calcite.sql.SqlOperator)"><code>policy(SqlOperator)</code></a></div> |
| </div> |
| <div class="block">Returns how to deduce whether a particular kind of expression is null, |
| given whether its arguments are null.</div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="policy(org.apache.calcite.rex.RexNode)">policy</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static</span> <span class="returnType"><a href="Strong.Policy.html" title="enum in org.apache.calcite.plan">Strong.Policy</a></span> <span class="memberName">policy</span>​(<span class="arguments"><a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> rexNode)</span></div> |
| <div class="block">Returns how to deduce whether a particular <a href="../rex/RexNode.html" title="class in org.apache.calcite.rex"><code>RexNode</code></a> expression is null, |
| given whether its arguments are null.</div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="policy(org.apache.calcite.sql.SqlOperator)">policy</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static</span> <span class="returnType"><a href="Strong.Policy.html" title="enum in org.apache.calcite.plan">Strong.Policy</a></span> <span class="memberName">policy</span>​(<span class="arguments"><a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql">SqlOperator</a> operator)</span></div> |
| <div class="block">Returns how to deduce whether a particular <a href="../sql/SqlOperator.html" title="class in org.apache.calcite.sql"><code>SqlOperator</code></a> expression is null, |
| given whether its arguments are null.</div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="isStrong(org.apache.calcite.rex.RexNode)">isStrong</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static</span> <span class="returnType">boolean</span> <span class="memberName">isStrong</span>​(<span class="arguments"><a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> e)</span></div> |
| <div class="block">Returns whether a given expression is strong. |
| |
| <p>Examples:</p> |
| <ul> |
| <li>Returns true for <code>c = 1</code> since it returns null if and only if |
| c is null |
| <li>Returns false for <code>c IS NULL</code> since it always returns TRUE |
| or FALSE |
| </ul></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>e</code> - Expression</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the expression is strong, false otherwise</dd> |
| </dl> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="allStrong(java.util.List)">allStrong</a></h3> |
| <div class="memberSignature"><span class="modifiers">public static</span> <span class="returnType">boolean</span> <span class="memberName">allStrong</span>​(<span class="arguments"><a href="https://docs.oracle.com/javase/9/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util" class="externalLink">List</a><<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</span></div> |
| <div class="block">Returns whether all expressions in a list are strong.</div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="isNotTrue(org.apache.calcite.rex.RexNode)">isNotTrue</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType">boolean</span> <span class="memberName">isNotTrue</span>​(<span class="arguments"><a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> node)</span></div> |
| <div class="block">Returns whether an expression is definitely not true.</div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="isNull(org.apache.calcite.rex.RexNode)">isNull</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType">boolean</span> <span class="memberName">isNull</span>​(<span class="arguments"><a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> node)</span></div> |
| <div class="block">Returns whether an expression is definitely null. |
| |
| <p>The answer is based on calls to <a href="#isNull(org.apache.calcite.rex.RexNode,org.apache.calcite.util.ImmutableBitSet)"><code>isNull(org.apache.calcite.rex.RexNode, org.apache.calcite.util.ImmutableBitSet)</code></a> for its constituent |
| expressions, and you may override methods to test hypotheses such as |
| "if <code>x</code> is null, is <code>x + y</code> null?</div> |
| </section> |
| </li> |
| <li class="blockList"> |
| <section class="detail"> |
| <h3><a id="isNull(org.apache.calcite.rex.RexInputRef)">isNull</a></h3> |
| <div class="memberSignature"><span class="modifiers">public</span> <span class="returnType">boolean</span> <span class="memberName">isNull</span>​(<span class="arguments"><a href="../rex/RexInputRef.html" title="class in org.apache.calcite.rex">RexInputRef</a> ref)</span></div> |
| <div class="block">Returns whether a given input is definitely null.</div> |
| </section> |
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