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| <li>Summary: </li> |
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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.plan</a></div> |
| <h2 title="Class Strong" class="title">Class Strong</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <li>org.apache.calcite.plan.Strong</li> |
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| <pre>public class <span class="typeNameLabel">Strong</span> |
| extends java.lang.Object</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> |
| </li> |
| </ul> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <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> |
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| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static java.util.Map<<a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a>,​<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="#MAP">MAP</a></span></code></th> |
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| </tr> |
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| <th class="colFirst" scope="col">Constructor</th> |
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| </tr> |
| <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> |
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| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#allNull(java.util.List)">allNull</a></span>​(java.util.List<<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 definitely null.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <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>​(java.util.List<<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 id="i2" class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#anyNull(java.util.List)">anyNull</a></span>​(java.util.List<<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 any expressions in a list are definitely null.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>private static java.util.Map<<a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a>,​<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="#createPolicyMap()">createPolicyMap</a></span>()</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <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 id="i5" class="rowColor"> |
| <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 id="i6" class="altColor"> |
| <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 id="i7" class="rowColor"> |
| <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 id="i8" class="altColor"> |
| <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 id="i9" class="rowColor"> |
| <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 id="i10" class="altColor"> |
| <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 id="i11" class="rowColor"> |
| <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">Returns how to deduce whether a particular kind of expression is null, |
| given whether its arguments are null.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a id="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
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| <h3>Field Detail</h3> |
| <a id="MAP"> |
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| <h4>MAP</h4> |
| <pre>private static final java.util.Map<<a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a>,​<a href="Strong.Policy.html" title="enum in org.apache.calcite.plan">Strong.Policy</a>> MAP</pre> |
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| <a id="<init>()"> |
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| <h4>Strong</h4> |
| <pre>public Strong()</pre> |
| </li> |
| </ul> |
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| <h4>of</h4> |
| <pre class="methodSignature">public static <a href="Strong.html" title="class in org.apache.calcite.plan">Strong</a> of​(<a href="../util/ImmutableBitSet.html" title="class in org.apache.calcite.util">ImmutableBitSet</a> nullColumns)</pre> |
| <div class="block">Returns a checker that consults a bit set to find out whether particular |
| inputs may be null.</div> |
| </li> |
| </ul> |
| <a id="isNull(org.apache.calcite.rex.RexNode,org.apache.calcite.util.ImmutableBitSet)"> |
| <!-- --> |
| </a> |
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| <h4>isNull</h4> |
| <pre class="methodSignature">public static boolean isNull​(<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)</pre> |
| <div class="block">Returns whether the analyzed expression will definitely return null if |
| all of a given set of input columns are null.</div> |
| </li> |
| </ul> |
| <a id="isNotTrue(org.apache.calcite.rex.RexNode,org.apache.calcite.util.ImmutableBitSet)"> |
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| <h4>isNotTrue</h4> |
| <pre class="methodSignature">public static boolean isNotTrue​(<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)</pre> |
| <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> |
| </li> |
| </ul> |
| <a id="policy(org.apache.calcite.sql.SqlKind)"> |
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| <h4>policy</h4> |
| <pre class="methodSignature">public static <a href="Strong.Policy.html" title="enum in org.apache.calcite.plan">Strong.Policy</a> policy​(<a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a> kind)</pre> |
| <div class="block">Returns how to deduce whether a particular kind of expression is null, |
| given whether its arguments are null.</div> |
| </li> |
| </ul> |
| <a id="isStrong(org.apache.calcite.rex.RexNode)"> |
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| <h4>isStrong</h4> |
| <pre class="methodSignature">public static boolean isStrong​(<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> e)</pre> |
| <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> |
| </li> |
| </ul> |
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| <h4>allStrong</h4> |
| <pre class="methodSignature">public static boolean allStrong​(java.util.List<<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</pre> |
| <div class="block">Returns whether all expressions in a list are strong.</div> |
| </li> |
| </ul> |
| <a id="isNotTrue(org.apache.calcite.rex.RexNode)"> |
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| </a> |
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| <h4>isNotTrue</h4> |
| <pre class="methodSignature">public boolean isNotTrue​(<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> node)</pre> |
| <div class="block">Returns whether an expression is definitely not true.</div> |
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| <h4>isNull</h4> |
| <pre class="methodSignature">public boolean isNull​(<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a> node)</pre> |
| <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> |
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| <h4>isNull</h4> |
| <pre class="methodSignature">public boolean isNull​(<a href="../rex/RexInputRef.html" title="class in org.apache.calcite.rex">RexInputRef</a> ref)</pre> |
| <div class="block">Returns whether a given input is definitely null.</div> |
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| <h4>allNull</h4> |
| <pre class="methodSignature">private boolean allNull​(java.util.List<<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</pre> |
| <div class="block">Returns whether all expressions in a list are definitely null.</div> |
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| <h4>anyNull</h4> |
| <pre class="methodSignature">private boolean anyNull​(java.util.List<<a href="../rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>> operands)</pre> |
| <div class="block">Returns whether any expressions in a list are definitely null.</div> |
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| <h4>createPolicyMap</h4> |
| <pre class="methodSignature">private static java.util.Map<<a href="../sql/SqlKind.html" title="enum in org.apache.calcite.sql">SqlKind</a>,​<a href="Strong.Policy.html" title="enum in org.apache.calcite.plan">Strong.Policy</a>> createPolicyMap()</pre> |
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