org.apache.pig.newplan.logical.expression

Class BinCondExpression

java.lang.Object

org.apache.pig.newplan.Operator

org.apache.pig.newplan.logical.expression.LogicalExpression

org.apache.pig.newplan.logical.expression.BinCondExpression

public class BinCondExpression
extends LogicalExpression

Field Summary

Fields inherited from class org.apache.pig.newplan.logical.expression.LogicalExpression

fieldSchema, uidOnlyFieldSchema

Fields inherited from class org.apache.pig.newplan.Operator

annotations, hashPrime, location, name, plan

Constructor Summary

Constructors

Constructor and Description
BinCondExpression(OperatorPlan plan, LogicalExpression condition, LogicalExpression lhs, LogicalExpression rhs) Will add this operator to the plan and connect it to the left and right hand side operators and the condition operator

Method Summary

Modifier and Type	Method and Description
void	accept(PlanVisitor v) Accept a visitor at this node in the graph.
LogicalExpression	deepCopy(LogicalExpressionPlan lgExpPlan) Create the deep copy of this expression and add that into the passed LogicalExpressionPlan Return the copy of this expression with updated logical expression plan.
LogicalExpression	getCondition() Returns the operator which handles this condition
LogicalSchema.LogicalFieldSchema	getFieldSchema() Get the field schema for the output of this expression operator.
LogicalExpression	getLhs() Get the left hand side of this expression.
LogicalExpression	getRhs() Get the right hand side of this expression.
boolean	isEqual(Operator other) This is like a shallow equals comparison.

Methods inherited from class org.apache.pig.newplan.logical.expression.LogicalExpression

getNextUid, getType, hasFieldSchema, neverUseForRealSetFieldSchema, resetFieldSchema, resetNextUid, resetUid, toString

Methods inherited from class org.apache.pig.newplan.Operator

annotate, getAnnotation, getLocation, getName, getPlan, removeAnnotation, setLocation, setPlan

Methods inherited from class java.lang.Object

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

Constructor Detail

BinCondExpression

public BinCondExpression(OperatorPlan plan,
                         LogicalExpression condition,
                         LogicalExpression lhs,
                         LogicalExpression rhs)

Will add this operator to the plan and connect it to the left and right hand side operators and the condition operator

Parameters:

plan - plan this operator is part of

lhs - expression on its left hand side

rhs - expression on its right hand side

Method Detail

getCondition

public LogicalExpression getCondition()
                               throws FrontendException

Returns the operator which handles this condition

Returns:

expression which handles the condition

Throws:

FrontendException

getLhs

public LogicalExpression getLhs()
                         throws FrontendException

Get the left hand side of this expression.

Returns:

expression on the left hand side

Throws:

FrontendException

getRhs

public LogicalExpression getRhs()
                         throws FrontendException

Get the right hand side of this expression.

Returns:

expression on the right hand side

Throws:

FrontendException

accept

public void accept(PlanVisitor v)
            throws FrontendException

Description copied from class: Operator

Accept a visitor at this node in the graph.

Specified by:

accept in class Operator

Parameters:

v - Visitor to accept.

Throws:

FrontendException

isEqual

public boolean isEqual(Operator other)
                throws FrontendException

Description copied from class: Operator

This is like a shallow equals comparison. It returns true if two operators have equivalent properties even if they are different objects. Here properties mean equivalent plan and equivalent name.

Specified by:

isEqual in class Operator

Returns:

true if two object have equivalent properties, else false

Throws:

FrontendException

getFieldSchema

public LogicalSchema.LogicalFieldSchema getFieldSchema()
                                                throws FrontendException

Description copied from class: LogicalExpression

Get the field schema for the output of this expression operator. This does not merely return the field schema variable. If schema is not yet set, this will attempt to construct it. Therefore it is abstract since each operator will need to construct its field schema differently.

Specified by:

getFieldSchema in class LogicalExpression

Returns:

the FieldSchema

Throws:

FrontendException

deepCopy

public LogicalExpression deepCopy(LogicalExpressionPlan lgExpPlan)
                           throws FrontendException

Description copied from class: LogicalExpression

Create the deep copy of this expression and add that into the passed LogicalExpressionPlan Return the copy of this expression with updated logical expression plan.

Specified by:

deepCopy in class LogicalExpression

Parameters:

lgExpPlan - LogicalExpressionPlan in which this expression will be added.

Returns:

LogicalExpression with its own logical expression plan.

Throws:

FrontendException