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<div class="subTitle">org.apache.calcite.rex</div>
<h2 title="Class RexSimplify" class="title">Class RexSimplify</h2>
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<pre>public class <span class="typeNameLabel">RexSimplify</span>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">Context required to simplify a row-expression.</div>
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<h3>Field Summary</h3>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#rexBuilder">rexBuilder</a></span></code>&nbsp;</td>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#RexSimplify-org.apache.calcite.rex.RexBuilder-boolean-org.apache.calcite.rex.RexExecutor-">RexSimplify</a></span>(<a href="../../../../org/apache/calcite/rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a>&nbsp;rexBuilder,
boolean&nbsp;unknownAsFalse,
<a href="../../../../org/apache/calcite/rex/RexExecutor.html" title="interface in org.apache.calcite.rex">RexExecutor</a>&nbsp;executor)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#RexSimplify-org.apache.calcite.rex.RexBuilder-org.apache.calcite.plan.RelOptPredicateList-boolean-org.apache.calcite.rex.RexExecutor-">RexSimplify</a></span>(<a href="../../../../org/apache/calcite/rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a>&nbsp;rexBuilder,
<a href="../../../../org/apache/calcite/plan/RelOptPredicateList.html" title="class in org.apache.calcite.plan">RelOptPredicateList</a>&nbsp;predicates,
boolean&nbsp;unknownAsFalse,
<a href="../../../../org/apache/calcite/rex/RexExecutor.html" title="interface in org.apache.calcite.rex">RexExecutor</a>&nbsp;executor)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</td>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#RexSimplify-org.apache.calcite.rex.RexBuilder-org.apache.calcite.plan.RelOptPredicateList-org.apache.calcite.rex.RexExecutor-">RexSimplify</a></span>(<a href="../../../../org/apache/calcite/rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a>&nbsp;rexBuilder,
<a href="../../../../org/apache/calcite/plan/RelOptPredicateList.html" title="class in org.apache.calcite.plan">RelOptPredicateList</a>&nbsp;predicates,
<a href="../../../../org/apache/calcite/rex/RexExecutor.html" title="interface in org.apache.calcite.rex">RexExecutor</a>&nbsp;executor)</code>
<div class="block">Creates a RexSimplify.</div>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t6" class="tableTab"><span><a href="javascript:show(32);">Deprecated Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#removeNullabilityCast-org.apache.calcite.rex.RexNode-">removeNullabilityCast</a></span>(<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;e)</code>
<div class="block">Removes any casts that change nullability but not type.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplify-org.apache.calcite.rex.RexNode-">simplify</a></span>(<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;e)</code>
<div class="block">Simplifies a boolean expression.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplifyAnd-org.apache.calcite.rex.RexCall-">simplifyAnd</a></span>(<a href="../../../../org/apache/calcite/rex/RexCall.html" title="class in org.apache.calcite.rex">RexCall</a>&nbsp;e)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplifyAnds-java.lang.Iterable-">simplifyAnds</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a>&lt;? extends <a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&nbsp;nodes)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplifyFilterPredicates-java.lang.Iterable-">simplifyFilterPredicates</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a>&lt;? extends <a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&nbsp;predicates)</code>
<div class="block">Combines predicates AND, optimizes, and returns null if the result is
always false.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplifyOr-org.apache.calcite.rex.RexCall-">simplifyOr</a></span>(<a href="../../../../org/apache/calcite/rex/RexCall.html" title="class in org.apache.calcite.rex">RexCall</a>&nbsp;call)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplifyOrs-java.util.List-">simplifyOrs</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&nbsp;terms)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplifyPreservingType-org.apache.calcite.rex.RexNode-">simplifyPreservingType</a></span>(<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;e)</code>
<div class="block">Simplifies a boolean expression, always preserving its type and its
nullability.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplifyPreservingType-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexUnknownAs-boolean-">simplifyPreservingType</a></span>(<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;e,
<a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a>&nbsp;unknownAs,
boolean&nbsp;matchNullability)</code>&nbsp;</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplifyUnknownAs-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexUnknownAs-">simplifyUnknownAs</a></span>(<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;e,
<a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a>&nbsp;unknownAs)</code>
<div class="block">As <a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplify-org.apache.calcite.rex.RexNode-"><code>simplify(RexNode)</code></a>, but specifying how UNKNOWN values are to be
treated.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplifyUnknownAsFalse-org.apache.calcite.rex.RexNode-">simplifyUnknownAsFalse</a></span>(<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;e)</code>
<div class="block">As <a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplify-org.apache.calcite.rex.RexNode-"><code>simplify(RexNode)</code></a>, but for a boolean expression
for which a result of UNKNOWN will be treated as FALSE.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexSimplify.html" title="class in org.apache.calcite.rex">RexSimplify</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#withParanoid-boolean-">withParanoid</a></span>(boolean&nbsp;paranoid)</code>
<div class="block">Returns a RexSimplify the same as this but which verifies that
the expression before and after simplification are equivalent.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexSimplify.html" title="class in org.apache.calcite.rex">RexSimplify</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#withPredicates-org.apache.calcite.plan.RelOptPredicateList-">withPredicates</a></span>(<a href="../../../../org/apache/calcite/plan/RelOptPredicateList.html" title="class in org.apache.calcite.plan">RelOptPredicateList</a>&nbsp;predicates)</code>
<div class="block">Returns a RexSimplify the same as this but with a specified
<a href="../../../../org/apache/calcite/rex/RexSimplify.html#predicates"><code>predicates</code></a> value.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/calcite/rex/RexSimplify.html" title="class in org.apache.calcite.rex">RexSimplify</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/rex/RexSimplify.html#withUnknownAsFalse-boolean-">withUnknownAsFalse</a></span>(boolean&nbsp;unknownAsFalse)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">Use methods with a <a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="enum in org.apache.calcite.rex"><code>RexUnknownAs</code></a> argument, such as
<a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplify-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexUnknownAs-"><code>simplify(RexNode, RexUnknownAs)</code></a>.</span></div>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h3>Field Detail</h3>
<a name="rexBuilder">
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<h4>rexBuilder</h4>
<pre>public final&nbsp;<a href="../../../../org/apache/calcite/rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a> rexBuilder</pre>
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<h3>Constructor Detail</h3>
<a name="RexSimplify-org.apache.calcite.rex.RexBuilder-org.apache.calcite.plan.RelOptPredicateList-org.apache.calcite.rex.RexExecutor-">
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<h4>RexSimplify</h4>
<pre>public&nbsp;RexSimplify(<a href="../../../../org/apache/calcite/rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a>&nbsp;rexBuilder,
<a href="../../../../org/apache/calcite/plan/RelOptPredicateList.html" title="class in org.apache.calcite.plan">RelOptPredicateList</a>&nbsp;predicates,
<a href="../../../../org/apache/calcite/rex/RexExecutor.html" title="interface in org.apache.calcite.rex">RexExecutor</a>&nbsp;executor)</pre>
<div class="block">Creates a RexSimplify.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rexBuilder</code> - Rex builder</dd>
<dd><code>predicates</code> - Predicates known to hold on input fields</dd>
<dd><code>executor</code> - Executor for constant reduction, not null</dd>
</dl>
</li>
</ul>
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<h4>RexSimplify</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;RexSimplify(<a href="../../../../org/apache/calcite/rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a>&nbsp;rexBuilder,
boolean&nbsp;unknownAsFalse,
<a href="../../../../org/apache/calcite/rex/RexExecutor.html" title="interface in org.apache.calcite.rex">RexExecutor</a>&nbsp;executor)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
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<h4>RexSimplify</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;RexSimplify(<a href="../../../../org/apache/calcite/rex/RexBuilder.html" title="class in org.apache.calcite.rex">RexBuilder</a>&nbsp;rexBuilder,
<a href="../../../../org/apache/calcite/plan/RelOptPredicateList.html" title="class in org.apache.calcite.plan">RelOptPredicateList</a>&nbsp;predicates,
boolean&nbsp;unknownAsFalse,
<a href="../../../../org/apache/calcite/rex/RexExecutor.html" title="interface in org.apache.calcite.rex">RexExecutor</a>&nbsp;executor)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;<a href="../../../../org/apache/calcite/rex/RexSimplify.html" title="class in org.apache.calcite.rex">RexSimplify</a>&nbsp;withUnknownAsFalse(boolean&nbsp;unknownAsFalse)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">Use methods with a <a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="enum in org.apache.calcite.rex"><code>RexUnknownAs</code></a> argument, such as
<a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplify-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexUnknownAs-"><code>simplify(RexNode, RexUnknownAs)</code></a>.</span></div>
<div class="block">Returns a RexSimplify the same as this but with a specified
<a href="../../../../org/apache/calcite/rex/RexSimplify.html#defaultUnknownAs"><code>defaultUnknownAs</code></a> value.</div>
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<h4>withPredicates</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/rex/RexSimplify.html" title="class in org.apache.calcite.rex">RexSimplify</a>&nbsp;withPredicates(<a href="../../../../org/apache/calcite/plan/RelOptPredicateList.html" title="class in org.apache.calcite.plan">RelOptPredicateList</a>&nbsp;predicates)</pre>
<div class="block">Returns a RexSimplify the same as this but with a specified
<a href="../../../../org/apache/calcite/rex/RexSimplify.html#predicates"><code>predicates</code></a> value.</div>
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<pre>public&nbsp;<a href="../../../../org/apache/calcite/rex/RexSimplify.html" title="class in org.apache.calcite.rex">RexSimplify</a>&nbsp;withParanoid(boolean&nbsp;paranoid)</pre>
<div class="block">Returns a RexSimplify the same as this but which verifies that
the expression before and after simplification are equivalent.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/apache/calcite/rex/RexSimplify.html#verify-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexNode-org.apache.calcite.rex.RexUnknownAs-"><code>verify(org.apache.calcite.rex.RexNode, org.apache.calcite.rex.RexNode, org.apache.calcite.rex.RexUnknownAs)</code></a></dd>
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<pre>public&nbsp;<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;simplifyPreservingType(<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;e)</pre>
<div class="block">Simplifies a boolean expression, always preserving its type and its
nullability.
<p>This is useful if you are simplifying expressions in a
<a href="../../../../org/apache/calcite/rel/core/Project.html" title="class in org.apache.calcite.rel.core"><code>Project</code></a>.</div>
</li>
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<pre>public&nbsp;<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;simplifyPreservingType(<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;e,
<a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a>&nbsp;unknownAs,
boolean&nbsp;matchNullability)</pre>
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<h4>simplify</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;simplify(<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;e)</pre>
<div class="block">Simplifies a boolean expression.
<p>In particular:</p>
<ul>
<li><code>simplify(x = 1 AND y = 2 AND NOT x = 1)</code>
returns <code>y = 2</code></li>
<li><code>simplify(x = 1 AND FALSE)</code>
returns <code>FALSE</code></li>
</ul>
<p>Handles UNKNOWN values using the policy specified when you created this
<code>RexSimplify</code>. Unless you used a deprecated constructor, that policy
is <a href="../../../../org/apache/calcite/rex/RexUnknownAs.html#UNKNOWN"><code>RexUnknownAs.UNKNOWN</code></a>.
<p>If the expression is a predicate in a WHERE clause, consider instead
using <a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplifyUnknownAsFalse-org.apache.calcite.rex.RexNode-"><code>simplifyUnknownAsFalse(RexNode)</code></a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>e</code> - Expression to simplify</dd>
</dl>
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</ul>
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<pre>public final&nbsp;<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;simplifyUnknownAsFalse(<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;e)</pre>
<div class="block">As <a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplify-org.apache.calcite.rex.RexNode-"><code>simplify(RexNode)</code></a>, but for a boolean expression
for which a result of UNKNOWN will be treated as FALSE.
<p>Use this form for expressions on a WHERE, ON, HAVING or FILTER(WHERE)
clause.
<p>This may allow certain additional simplifications. A result of UNKNOWN
may yield FALSE, however it may still yield UNKNOWN. (If the simplified
expression has type BOOLEAN NOT NULL, then of course it can only return
FALSE.)</div>
</li>
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<pre>public&nbsp;<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;simplifyUnknownAs(<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;e,
<a href="../../../../org/apache/calcite/rex/RexUnknownAs.html" title="enum in org.apache.calcite.rex">RexUnknownAs</a>&nbsp;unknownAs)</pre>
<div class="block">As <a href="../../../../org/apache/calcite/rex/RexSimplify.html#simplify-org.apache.calcite.rex.RexNode-"><code>simplify(RexNode)</code></a>, but specifying how UNKNOWN values are to be
treated.
<p>If UNKNOWN is treated as FALSE, this may allow certain additional
simplifications. A result of UNKNOWN may yield FALSE, however it may still
yield UNKNOWN. (If the simplified expression has type BOOLEAN NOT NULL,
then of course it can only return FALSE.)</div>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;simplifyAnds(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a>&lt;? extends <a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&nbsp;nodes)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Simplifies a conjunction of boolean expressions.</div>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;simplifyAnd(<a href="../../../../org/apache/calcite/rex/RexCall.html" title="class in org.apache.calcite.rex">RexCall</a>&nbsp;e)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;simplifyOr(<a href="../../../../org/apache/calcite/rex/RexCall.html" title="class in org.apache.calcite.rex">RexCall</a>&nbsp;call)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Simplifies OR(x, x) into x, and similar.
The simplified expression returns UNKNOWN values as is (not as FALSE).</div>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;simplifyOrs(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&nbsp;terms)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
<div class="block">Simplifies a list of terms and combines them into an OR.
Modifies the list in place.
The simplified expression returns UNKNOWN values as is (not as FALSE).</div>
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<h4>removeNullabilityCast</h4>
<pre>public&nbsp;<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;removeNullabilityCast(<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;e)</pre>
<div class="block">Removes any casts that change nullability but not type.
<p>For example, <code>CAST(1 = 0 AS BOOLEAN)</code> becomes <code>1 = 0</code>.</div>
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<pre>public&nbsp;<a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&nbsp;simplifyFilterPredicates(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a>&lt;? extends <a href="../../../../org/apache/calcite/rex/RexNode.html" title="class in org.apache.calcite.rex">RexNode</a>&gt;&nbsp;predicates)</pre>
<div class="block">Combines predicates AND, optimizes, and returns null if the result is
always false.
<p>The expression is simplified on the assumption that an UNKNOWN value
is always treated as FALSE. Therefore the simplified expression may
sometimes evaluate to FALSE where the original expression would evaluate to
UNKNOWN.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>predicates</code> - Filter condition predicates</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>simplified conjunction of predicates for the filter, null if always false</dd>
</dl>
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