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<h2 title="Class ComparisonPredicate" class="title">Class ComparisonPredicate&lt;C extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a>&lt;C&gt;&gt;</h2>
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<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/drill/common/expression/LogicalExpressionBase.html" title="class in org.apache.drill.common.expression">org.apache.drill.common.expression.LogicalExpressionBase</a></li>
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<li>org.apache.drill.exec.expr.ComparisonPredicate&lt;C&gt;</li>
</ul>
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<dt>All Implemented Interfaces:</dt>
<dd><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;<a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a>&gt;, <a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a>, <a href="../../../../../org/apache/drill/exec/expr/FilterPredicate.html" title="interface in org.apache.drill.exec.expr">FilterPredicate</a>&lt;C&gt;</dd>
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<pre>public class <span class="typeNameLabel">ComparisonPredicate&lt;C extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a>&lt;C&gt;&gt;</span>
extends <a href="../../../../../org/apache/drill/common/expression/LogicalExpressionBase.html" title="class in org.apache.drill.common.expression">LogicalExpressionBase</a>
implements <a href="../../../../../org/apache/drill/exec/expr/FilterPredicate.html" title="interface in org.apache.drill.exec.expr">FilterPredicate</a>&lt;C&gt;</pre>
<div class="block">Comparison predicates for metadata filter pushdown.</div>
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<h3>Nested classes/interfaces inherited from interface&nbsp;org.apache.drill.common.expression.<a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a></h3>
<code><a href="../../../../../org/apache/drill/common/expression/LogicalExpression.De.html" title="class in org.apache.drill.common.expression">LogicalExpression.De</a>, <a href="../../../../../org/apache/drill/common/expression/LogicalExpression.Se.html" title="class in org.apache.drill.common.expression">LogicalExpression.Se</a></code></li>
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<td class="colFirst"><code>&lt;T,V,E extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a>&gt;<br>T</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/ComparisonPredicate.html#accept-org.apache.drill.common.expression.visitors.ExprVisitor-V-">accept</a></span>(<a href="../../../../../org/apache/drill/common/expression/visitors/ExprVisitor.html" title="interface in org.apache.drill.common.expression.visitors">ExprVisitor</a>&lt;T,V,E&gt;&nbsp;visitor,
V&nbsp;value)</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>static &lt;C extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a>&lt;C&gt;&gt;<br><a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/ComparisonPredicate.html#createComparisonPredicate-java.lang.String-org.apache.drill.common.expression.LogicalExpression-org.apache.drill.common.expression.LogicalExpression-">createComparisonPredicate</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;function,
<a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a>&nbsp;left,
<a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a>&nbsp;right)</code>&nbsp;</td>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/ComparisonPredicate.html#iterator--">iterator</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code><a href="../../../../../org/apache/drill/exec/expr/stat/RowsMatch.html" title="enum in org.apache.drill.exec.expr.stat">RowsMatch</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/exec/expr/ComparisonPredicate.html#matches-org.apache.drill.exec.expr.StatisticsProvider-">matches</a></span>(<a href="../../../../../org/apache/drill/exec/expr/StatisticsProvider.html" title="class in org.apache.drill.exec.expr">StatisticsProvider</a>&lt;<a href="../../../../../org/apache/drill/exec/expr/ComparisonPredicate.html" title="type parameter in ComparisonPredicate">C</a>&gt;&nbsp;evaluator)</code>
<div class="block">Semantics of matches() is very similar to what is implemented in Parquet library's
<code>org.apache.parquet.filter2.statisticslevel.StatisticsFilter</code> and
<code>FilterPredicate</code>
Main difference :
1.</div>
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<code><a href="../../../../../org/apache/drill/common/expression/LogicalExpressionBase.html#getCumulativeCost--">getCumulativeCost</a>, <a href="../../../../../org/apache/drill/common/expression/LogicalExpressionBase.html#getDescription--">getDescription</a>, <a href="../../../../../org/apache/drill/common/expression/LogicalExpressionBase.html#getMajorType--">getMajorType</a>, <a href="../../../../../org/apache/drill/common/expression/LogicalExpressionBase.html#getPosition--">getPosition</a>, <a href="../../../../../org/apache/drill/common/expression/LogicalExpressionBase.html#getSelfCost--">getSelfCost</a>, <a href="../../../../../org/apache/drill/common/expression/LogicalExpressionBase.html#i-java.lang.StringBuilder-int-">i</a></code></li>
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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true#forEach-java.util.function.Consumer-" title="class or interface in java.lang">forEach</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true#spliterator--" title="class or interface in java.lang">spliterator</a></code></li>
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<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a>&gt;&nbsp;iterator()</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true#iterator--" title="class or interface in java.lang">iterator</a></code>&nbsp;in interface&nbsp;<code><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;<a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a>&gt;</code></dd>
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<a name="accept-org.apache.drill.common.expression.visitors.ExprVisitor-java.lang.Object-">
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<h4>accept</h4>
<pre>public&nbsp;&lt;T,V,E extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a>&gt;&nbsp;T&nbsp;accept(<a href="../../../../../org/apache/drill/common/expression/visitors/ExprVisitor.html" title="interface in org.apache.drill.common.expression.visitors">ExprVisitor</a>&lt;T,V,E&gt;&nbsp;visitor,
V&nbsp;value)
throws E extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html#accept-org.apache.drill.common.expression.visitors.ExprVisitor-V-">accept</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>E extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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<h4>matches</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/drill/exec/expr/stat/RowsMatch.html" title="enum in org.apache.drill.exec.expr.stat">RowsMatch</a>&nbsp;matches(<a href="../../../../../org/apache/drill/exec/expr/StatisticsProvider.html" title="class in org.apache.drill.exec.expr">StatisticsProvider</a>&lt;<a href="../../../../../org/apache/drill/exec/expr/ComparisonPredicate.html" title="type parameter in ComparisonPredicate">C</a>&gt;&nbsp;evaluator)</pre>
<div class="block">Semantics of matches() is very similar to what is implemented in Parquet library's
<code>org.apache.parquet.filter2.statisticslevel.StatisticsFilter</code> and
<code>FilterPredicate</code>
Main difference :
1. A RangeExprEvaluator is used to compute the min/max of an expression, such as CAST function
of a column. CAST function could be explicitly added by Drill user (It's recommended to use CAST
function after DRILL-4372, if user wants to reduce planning time for limit 0 query), or implicitly
inserted by Drill, when the types of compare operands are not identical. Therefore, it's important
to allow CAST function to appear in the filter predicate.
2. We do not require list of ColumnChunkMetaData to do the evaluation, while Parquet library's
StatisticsFilter has such requirement. Drill's ParquetTableMetaData does not maintain ColumnChunkMetaData,
making it impossible to directly use Parquet library's StatisticFilter in query planning time.
3. We allows both sides of comparison operator to be a min/max range. As such, we support
expression_of(Column1) < expression_of(Column2),
where Column1 and Column2 are from same parquet table.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/drill/exec/expr/FilterPredicate.html#matches-org.apache.drill.exec.expr.StatisticsProvider-">matches</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/drill/exec/expr/FilterPredicate.html" title="interface in org.apache.drill.exec.expr">FilterPredicate</a>&lt;<a href="../../../../../org/apache/drill/exec/expr/ComparisonPredicate.html" title="type parameter in ComparisonPredicate">C</a> extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a>&lt;<a href="../../../../../org/apache/drill/exec/expr/ComparisonPredicate.html" title="type parameter in ComparisonPredicate">C</a>&gt;&gt;</code></dd>
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<h4>createComparisonPredicate</h4>
<pre>public static&nbsp;&lt;C extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a>&lt;C&gt;&gt;&nbsp;<a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a>&nbsp;createComparisonPredicate(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;function,
<a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a>&nbsp;left,
<a href="../../../../../org/apache/drill/common/expression/LogicalExpression.html" title="interface in org.apache.drill.common.expression">LogicalExpression</a>&nbsp;right)</pre>
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