iceberg::ExpressionVisitor< R > Class Template Reference

Base visitor for traversing expression trees. More...

#include <expression_visitor.h>

Inheritance diagram for iceberg::ExpressionVisitor< R >:

Public Member Functions
virtual Result< R >	AlwaysTrue ()=0
	Visit a True expression (always evaluates to true).
virtual Result< R >	AlwaysFalse ()=0
	Visit a False expression (always evaluates to false).
virtual Result< R >	Not (ParamType child_result)=0
	Visit a Not expression.
virtual Result< R >	And (ParamType left_result, ParamType right_result)=0
	Visit an And expression.
virtual Result< R >	Or (ParamType left_result, ParamType right_result)=0
	Visit an Or expression.
virtual Result< R >	Predicate (const std::shared_ptr< BoundPredicate > &pred)=0
	Visit a bound predicate.
virtual Result< R >	Predicate (const std::shared_ptr< UnboundPredicate > &pred)=0
	Visit an unbound predicate.
virtual Result< R >	Aggregate (const std::shared_ptr< BoundAggregate > &aggregate)
	Visit a bound aggregate.
virtual Result< R >	Aggregate (const std::shared_ptr< UnboundAggregate > &aggregate)
	Visit an unbound aggregate.

Detailed Description

template<typename R>
class iceberg::ExpressionVisitor< R >

Base visitor for traversing expression trees.

This visitor traverses expression trees in postorder traversal and calls appropriate visitor methods for each node. Subclasses can override specific methods to implement custom behavior.

Template Parameters

R	The return type produced by visitor methods

Member Function Documentation

Aggregate() [1/2]

template<typename R >

virtual Result< R > iceberg::ExpressionVisitor< R >::Aggregate ( const std::shared_ptr< BoundAggregate > &  aggregate )

inlinevirtual

Visit a bound aggregate.

Parameters

aggregate

The bound aggregate to visit.

Reimplemented in iceberg::Binder, iceberg::IsBoundVisitor, and iceberg::ReferenceVisitor.

Aggregate() [2/2]

template<typename R >

virtual Result< R > iceberg::ExpressionVisitor< R >::Aggregate ( const std::shared_ptr< UnboundAggregate > &  aggregate )

inlinevirtual

Visit an unbound aggregate.

Parameters

aggregate

The unbound aggregate to visit.

Reimplemented in iceberg::Binder, iceberg::IsBoundVisitor, and iceberg::ReferenceVisitor.

AlwaysFalse()

template<typename R >

virtual Result< R > iceberg::ExpressionVisitor< R >::AlwaysFalse ( )

pure virtual

Visit a False expression (always evaluates to false).

Implemented in iceberg::Binder, iceberg::IsBoundVisitor, iceberg::ReferenceVisitor, iceberg::EvalVisitor, iceberg::InclusiveMetricsVisitor, iceberg::ManifestEvalVisitor, iceberg::ProjectionVisitor, iceberg::RewriteNot, and iceberg::StrictMetricsVisitor.

AlwaysTrue()

template<typename R >

virtual Result< R > iceberg::ExpressionVisitor< R >::AlwaysTrue ( )

pure virtual

Visit a True expression (always evaluates to true).

Implemented in iceberg::Binder, iceberg::IsBoundVisitor, iceberg::ReferenceVisitor, iceberg::EvalVisitor, iceberg::InclusiveMetricsVisitor, iceberg::ManifestEvalVisitor, iceberg::ProjectionVisitor, iceberg::RewriteNot, and iceberg::StrictMetricsVisitor.

And()

template<typename R >

virtual Result< R > iceberg::ExpressionVisitor< R >::And ( ParamType  left_result, ParamType  right_result  )

pure virtual

Visit an And expression.

Parameters

left_result	The result from visiting the left child
right_result	The result from visiting the right child

Not()

template<typename R >

virtual Result< R > iceberg::ExpressionVisitor< R >::Not ( ParamType  child_result )

pure virtual

Visit a Not expression.

Parameters

child_result

The result from visiting the child expression

Or()

template<typename R >

virtual Result< R > iceberg::ExpressionVisitor< R >::Or ( ParamType  left_result, ParamType  right_result  )

pure virtual

Visit an Or expression.

Parameters

left_result	The result from visiting the left child
right_result	The result from visiting the right child

Predicate() [1/2]

template<typename R >

virtual Result< R > iceberg::ExpressionVisitor< R >::Predicate ( const std::shared_ptr< BoundPredicate > &  pred )

pure virtual

Visit a bound predicate.

Parameters

pred	The bound predicate to visit

Implemented in iceberg::Binder, iceberg::IsBoundVisitor, iceberg::ReferenceVisitor, iceberg::BoundVisitor< R >, iceberg::BoundVisitor< bool >, iceberg::ProjectionVisitor, iceberg::InclusiveProjectionVisitor, iceberg::StrictProjectionVisitor, and iceberg::RewriteNot.

Predicate() [2/2]

template<typename R >

virtual Result< R > iceberg::ExpressionVisitor< R >::Predicate ( const std::shared_ptr< UnboundPredicate > &  pred )

pure virtual

Visit an unbound predicate.

Parameters

pred	The unbound predicate to visit

Implemented in iceberg::Binder, iceberg::IsBoundVisitor, iceberg::ReferenceVisitor, iceberg::BoundVisitor< R >, iceberg::BoundVisitor< bool >, iceberg::ProjectionVisitor, and iceberg::RewriteNot.

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The documentation for this class was generated from the following file:

• iceberg/expression/expression_visitor.h