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| <h1 title="Package" class="title">Package org.apache.drill.exec.expr</h1> |
| <div class="docSummary"> |
| <div class="block">Drill expression materialization and evaluation facilities.</div> |
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| <p>See: <a href="#package.description">Description</a></p> |
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| <tr> |
| <th class="colFirst" scope="col">Interface</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/DrillAggFunc.html" title="interface in org.apache.drill.exec.expr">DrillAggFunc</a></td> |
| <td class="colLast"> |
| <div class="block">Aggregate function interface.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/DrillFunc.html" title="interface in org.apache.drill.exec.expr">DrillFunc</a></td> |
| <td class="colLast"> </td> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/DrillSimpleFunc.html" title="interface in org.apache.drill.exec.expr">DrillSimpleFunc</a></td> |
| <td class="colLast"> </td> |
| </tr> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/FilterPredicate.html" title="interface in org.apache.drill.exec.expr">FilterPredicate</a><T 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><T>></td> |
| <td class="colLast"> </td> |
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| <tr> |
| <th class="colFirst" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/AbstractExecExprVisitor.html" title="class in org.apache.drill.exec.expr">AbstractExecExprVisitor</a><T,VAL,EXCEP 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>></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/BatchReference.html" title="class in org.apache.drill.exec.expr">BatchReference</a></td> |
| <td class="colLast"> |
| <div class="block">Holder class that contains batch naming, batch and record index.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/BooleanPredicate.html" title="class in org.apache.drill.exec.expr">BooleanPredicate</a><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><C>></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.html" title="class in org.apache.drill.exec.expr">ClassGenerator</a><T></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.HoldingContainer.html" title="class in org.apache.drill.exec.expr">ClassGenerator.HoldingContainer</a></td> |
| <td class="colLast"> |
| <div class="block">Represents a (Nullable)?(Type)Holder instance.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/CloneVisitor.html" title="class in org.apache.drill.exec.expr">CloneVisitor</a></td> |
| <td class="colLast"> |
| <div class="block">Creates a deep copy of a LogicalExpression.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/CodeGenerator.html" title="class in org.apache.drill.exec.expr">CodeGenerator</a><T></td> |
| <td class="colLast"> |
| <div class="block">A code generator is responsible for generating the Java source code required |
| to complete the implementation of an abstract template.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/ComparisonPredicate.html" title="class in org.apache.drill.exec.expr">ComparisonPredicate</a><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><C>></td> |
| <td class="colLast"> |
| <div class="block">Comparison predicates for metadata filter pushdown.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/DebugStringBuilder.html" title="class in org.apache.drill.exec.expr">DebugStringBuilder</a></td> |
| <td class="colLast"> |
| <div class="block">Utility class to build a debug string for an object |
| in a standard format.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/DirectExpression.html" title="class in org.apache.drill.exec.expr">DirectExpression</a></td> |
| <td class="colLast"> |
| <div class="block">Encapsulates a Java expression, defined as anything that is |
| valid in the following code:<br> |
| <code>(<i>expr</i>)</code></div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/DrillFuncHolderExpr.html" title="class in org.apache.drill.exec.expr">DrillFuncHolderExpr</a></td> |
| <td class="colLast"> |
| <div class="block">Represents the call of a function within a query and includes |
| the actual arguments and a reference to the function declaration (as a |
| "function holder.")</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/EscapeTest1.html" title="class in org.apache.drill.exec.expr">EscapeTest1</a></td> |
| <td class="colLast"> </td> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/EscapeTest1.EH.html" title="class in org.apache.drill.exec.expr">EscapeTest1.EH</a></td> |
| <td class="colLast"> </td> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/EscapeTest1.Monkey.html" title="class in org.apache.drill.exec.expr">EscapeTest1.Monkey</a></td> |
| <td class="colLast"> </td> |
| </tr> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/EscapeTest1.RR.html" title="class in org.apache.drill.exec.expr">EscapeTest1.RR</a></td> |
| <td class="colLast"> </td> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/EscapeTest1.Timer.html" title="class in org.apache.drill.exec.expr">EscapeTest1.Timer</a></td> |
| <td class="colLast"> </td> |
| </tr> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/EvaluationVisitor.html" title="class in org.apache.drill.exec.expr">EvaluationVisitor</a></td> |
| <td class="colLast"> |
| <div class="block">Visitor that generates code for eval</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/EvaluationVisitor.VectorVariableHolder.html" title="class in org.apache.drill.exec.expr">EvaluationVisitor.VectorVariableHolder</a></td> |
| <td class="colLast"> |
| <div class="block">Extended variable descriptor ("holding container") for the variable |
| which references the value holder ("FooHolder") that stores the value |
| from a value vector.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/ExpressionTest.html" title="class in org.apache.drill.exec.expr">ExpressionTest</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/ExpressionTreeMaterializer.html" title="class in org.apache.drill.exec.expr">ExpressionTreeMaterializer</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/FilterBuilder.html" title="class in org.apache.drill.exec.expr">FilterBuilder</a></td> |
| <td class="colLast"> |
| <div class="block">A visitor which visits a materialized logical expression, and build |
| FilterPredicate If a visitXXX method returns null, that means the |
| corresponding filter branch is not qualified for push down.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/GetSetVectorHelper.html" title="class in org.apache.drill.exec.expr">GetSetVectorHelper</a></td> |
| <td class="colLast"> </td> |
| </tr> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/HashVisitor.html" title="class in org.apache.drill.exec.expr">HashVisitor</a></td> |
| <td class="colLast"> </td> |
| </tr> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/HiveFuncHolderExpr.html" title="class in org.apache.drill.exec.expr">HiveFuncHolderExpr</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/HoldingContainerExpression.html" title="class in org.apache.drill.exec.expr">HoldingContainerExpression</a></td> |
| <td class="colLast"> |
| <div class="block">Wrapper around a representation of a "Holder" to represent that |
| Holder as an expression.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/IsPredicate.html" title="class in org.apache.drill.exec.expr">IsPredicate</a><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><C>></td> |
| <td class="colLast"> </td> |
| </tr> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/SingleClassStringWriter.html" title="class in org.apache.drill.exec.expr">SingleClassStringWriter</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/SizedJBlock.html" title="class in org.apache.drill.exec.expr">SizedJBlock</a></td> |
| <td class="colLast"> |
| <div class="block">Uses this class to keep track # of Drill Logical Expressions that are |
| put to JBlock.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/StatisticsProvider.html" title="class in org.apache.drill.exec.expr">StatisticsProvider</a><T 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><T>></td> |
| <td class="colLast"> </td> |
| </tr> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/TestLogicalExprSerDe.html" title="class in org.apache.drill.exec.expr">TestLogicalExprSerDe</a></td> |
| <td class="colLast"> |
| <div class="block">Test LogicalExpressions are serialized and deserialized properly when query is planned into multiple fragments.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/TestSchemaPathMaterialization.html" title="class in org.apache.drill.exec.expr">TestSchemaPathMaterialization</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/ValueVectorReadExpression.html" title="class in org.apache.drill.exec.expr">ValueVectorReadExpression</a></td> |
| <td class="colLast"> |
| <div class="block">Wraps a value vector field to be read, providing metadata about the field.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/ValueVectorWriteExpression.html" title="class in org.apache.drill.exec.expr">ValueVectorWriteExpression</a></td> |
| <td class="colLast"> </td> |
| </tr> |
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| <th class="colFirst" scope="col">Enum</th> |
| <th class="colLast" scope="col">Description</th> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.BlkCreateMode.html" title="enum in org.apache.drill.exec.expr">ClassGenerator.BlkCreateMode</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../org/apache/drill/exec/expr/ClassGenerator.BlockType.html" title="enum in org.apache.drill.exec.expr">ClassGenerator.BlockType</a></td> |
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| <a name="package.description"> |
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| <h2 title="Package org.apache.drill.exec.expr Description">Package org.apache.drill.exec.expr Description</h2> |
| <div class="block">Drill expression materialization and evaluation facilities. |
| |
| Drill exposes an interface for defining custom scalar and aggregate functions. |
| These functions are found by scanning the classpath at runtime and allow users |
| to add their own functions without rebuilding Drill or changing cluster |
| configuration. |
| |
| The classes that define these functions are actually decomposed at the source |
| level, copied into generated code blocks to evaluate an entire expression |
| tree. This generated source is built at run-time as schema is discovered. |
| |
| This package contains the <code>DrillSimpleFunc</code> and <code>DrillAggFunc</code> |
| interfaces that can be implemented by users to define their own aggregate |
| and scalar functions.</div> |
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