org.apache.tajo.plan.util

Class ExprFinder

java.lang.Object

org.apache.tajo.plan.algebra.BaseAlgebraVisitor<CONTEXT,RESULT>

org.apache.tajo.plan.visitor.SimpleAlgebraVisitor<org.apache.tajo.plan.util.ExprFinder.Context,Object>

org.apache.tajo.plan.util.ExprFinder

All Implemented Interfaces:

AlgebraVisitor<org.apache.tajo.plan.util.ExprFinder.Context,Object>

public class ExprFinder
extends SimpleAlgebraVisitor<org.apache.tajo.plan.util.ExprFinder.Context,Object>

Constructor Summary

Constructors

Constructor and Description
ExprFinder()

Method Summary

Methods

Modifier and Type	Method and Description
static <T extends Expr> Set<T>	finds(Expr expr, OpType type)
Object	visit(org.apache.tajo.plan.util.ExprFinder.Context ctx, Stack<Expr> stack, Expr expr) visit visits each relational operator expression recursively.

Methods inherited from class org.apache.tajo.plan.visitor.SimpleAlgebraVisitor

visitAlterTable, visitBetween, visitBinaryOperator, visitCaseWhen, visitCountRowsFunction, visitCreateTable, visitDataType, visitDropTable, visitFilter, visitFunction, visitGeneralSetFunction, visitGroupBy, visitHaving, visitInsert, visitJoin, visitLimit, visitLiteral, visitNullLiteral, visitProjection, visitRelationList, visitSort, visitTableSubQuery, visitTimeLiteral, visitTimestampLiteral, visitUnaryOperator, visitValueListExpr, visitWindowFunction

Methods inherited from class org.apache.tajo.plan.algebra.BaseAlgebraVisitor

postHook, preHook, visitAlterTablespace, visitAnd, visitCastExpr, visitColumnReference, visitConcatenate, visitCreateDatabase, visitDateLiteral, visitDivide, visitDropDatabase, visitEquals, visitExcept, visitExistsPredicate, visitExplain, visitGreaterThan, visitGreaterThanOrEquals, visitInPredicate, visitIntersect, visitIntervalLiteral, visitIsNullPredicate, visitLessThan, visitLessThanOrEquals, visitLikePredicate, visitMinus, visitModular, visitMultiply, visitNot, visitNotEquals, visitOr, visitPlus, visitQualifiedAsterisk, visitRegexpPredicate, visitRelation, visitScalarSubQuery, visitSetSession, visitSign, visitSimilarToPredicate, visitSimpleTableSubQuery, visitTargetExpr, visitTruncateTable, visitUnion

Methods inherited from class java.lang.Object

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

Constructor Detail

ExprFinder

public ExprFinder()

Method Detail

finds

public static <T extends Expr> Set<T> finds(Expr expr,
                            OpType type)

visit

public Object visit(org.apache.tajo.plan.util.ExprFinder.Context ctx,
           Stack<Expr> stack,
           Expr expr)
             throws PlanningException

Description copied from class: BaseAlgebraVisitor

visit visits each relational operator expression recursively.

Overrides:

visit in class SimpleAlgebraVisitor<org.apache.tajo.plan.util.ExprFinder.Context,Object>

stack - The stack contains the upper operators' type.

expr - The visiting relational operator

Throws:

PlanningException