Package org.apache.drill.exec.store.parquet

Class FilterEvaluatorUtils.FieldReferenceFinder

java.lang.Object

org.apache.drill.common.expression.visitors.AbstractExprVisitor<Set<SchemaPath>,Void,RuntimeException>

org.apache.drill.exec.store.parquet.FilterEvaluatorUtils.FieldReferenceFinder

All Implemented Interfaces:

ExprVisitor<Set<SchemaPath>,Void,RuntimeException>

Enclosing class:

FilterEvaluatorUtils

public static class FilterEvaluatorUtils.FieldReferenceFinder
extends AbstractExprVisitor<Set<SchemaPath>,Void,RuntimeException>

Search through a LogicalExpression, finding all internal schema path references and returning them in a set.

Field Summary

Fields

Modifier and Type	Field	Description
static final FilterEvaluatorUtils.FieldReferenceFinder	INSTANCE

Constructor Summary

Constructors

Constructor	Description
FieldReferenceFinder()

Method Summary

Modifier and Type	Method	Description
Set<SchemaPath>	visitSchemaPath(SchemaPath path, Void value)
Set<SchemaPath>	visitUnknown(LogicalExpression e, Void value)	Handles implementation-specific expressions not known to the visitor structure.

Methods inherited from class org.apache.drill.common.expression.visitors.AbstractExprVisitor

visitAnyValueExpression, visitBooleanConstant, visitBooleanOperator, visitCastExpression, visitConvertExpression, visitDateConstant, visitDecimal18Constant, visitDecimal28Constant, visitDecimal38Constant, visitDecimal9Constant, visitDoubleConstant, visitFloatConstant, visitFunctionCall, visitFunctionHolderExpression, visitIfExpression, visitIntConstant, visitIntervalDayConstant, visitIntervalYearConstant, visitLongConstant, visitNullConstant, visitNullExpression, visitParameter, visitQuotedStringConstant, visitTimeConstant, visitTimeStampConstant, visitTypedFieldExpr, visitVarDecimalConstant

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

INSTANCE

public static final FilterEvaluatorUtils.FieldReferenceFinder INSTANCE

Constructor Details

FieldReferenceFinder

public FieldReferenceFinder()

Method Details

visitSchemaPath

public Set<SchemaPath> visitSchemaPath(SchemaPath path,
 Void value)

Specified by:

visitSchemaPath in interface ExprVisitor<Set<SchemaPath>,Void,RuntimeException>

Overrides:

visitSchemaPath in class AbstractExprVisitor<Set<SchemaPath>,Void,RuntimeException>

visitUnknown

public Set<SchemaPath> visitUnknown(LogicalExpression e,
 Void value)

Description copied from class: AbstractExprVisitor

Handles implementation-specific expressions not known to the visitor structure. Since there are no "visitFoo" methods for these "unknown" expressions, subclassses should use the functionally-equivalent instanceof approach to parse out these "unknown" expressions.

Specified by:

visitUnknown in interface ExprVisitor<Set<SchemaPath>,Void,RuntimeException>

Overrides:

visitUnknown in class AbstractExprVisitor<Set<SchemaPath>,Void,RuntimeException>