ExprNode is an abstract class of all expressions. More...

#include <expr/ExprNode.h>

Inheritance diagram for taco::ExprNode:

Public Member Functions
template<class ... UniquePtrs>
	ExprNode (NodeTag tag, UniquePtrs &&...input)
	Base constructor for all expression nodes. More...

virtual	~ExprNode ()
	Deconstructor. More...

virtual Datum	Eval (const std::vector< NullableDatumRef > &record) const =0
	Evaluate function upon a deserialized record. More...

virtual Datum	Eval (const char *record) const =0
	Evaluate function on top of a serialized record. More...

std::shared_ptr< const SysTable_Type >	ReturnType () const
	Derive the return type of this expression. More...

Public Member Functions inherited from taco::TreeNode
template<class ... UniquePtrs>
	TreeNode (NodeTag tag, UniquePtrs &&...input)

virtual	~TreeNode ()

	TreeNode (TreeNode &&)=default

TreeNode &	operator= (TreeNode &&)=default

	TreeNode (const TreeNode &)=delete

TreeNode &	operator= (const TreeNode &)=delete

constexpr NodeTag	get_tag () const

TreeNode *	get_input (size_t i) const

template<class Node >
Node *	get_input_as (size_t i) const

std::string	to_string () const

void	node_to_string (std::string &buf, int indent) const
	Prints the node contents to a string buffer. More...

const char *	node_name () const

virtual void	node_properties_to_string (std::string &buf, int indent) const =0

Protected Attributes
std::shared_ptr< const SysTable_Type >	m_type

Additional Inherited Members
Static Public Member Functions inherited from taco::TreeNode
static void	append_indent (std::string &buf, int indent)

Detailed Description

ExprNode is an abstract class of all expressions.

It provides the basic interface to construct, evaluate and derive return type of expressions. An expression should be evaluated upon a record, where essential schema and type information is passed through certain levels of the expression tree (e.g. Variable, Literal, Cast, etc.).

Constructor & Destructor Documentation

◆ ExprNode()

template<class ... UniquePtrs>

taco::ExprNode::ExprNode	(	NodeTag	tag,
		UniquePtrs &&...	input
	)

inline

Base constructor for all expression nodes.

It is marked with a node tag (see include/utils/tree/node_Tags.inc for more details) and unique pointers to all of its children execution states. The unique pointers to its children will be moved to TreeNode internal states after the construction so you don't have to remember it separately.

Note: You can use TAG(ClassName) to get the corresponding tag for a plan execution state. For example, TAG(Literal) will give you the tag of Literal.

◆ ~ExprNode()

virtual taco::ExprNode::~ExprNode ( )

inlinevirtual

Deconstructor.

Member Function Documentation

◆ Eval() [1/2]

virtual Datum taco::ExprNode::Eval ( const char * record ) const

pure virtual

Evaluate function on top of a serialized record.

Implemented in taco::FuncCallOperator, taco::BinaryOperator, taco::Literal, taco::OrOperator, taco::UnaryOperator, taco::Variable, taco::AndOperator, and taco::Cast.

◆ Eval() [2/2]

virtual Datum taco::ExprNode::Eval ( const std::vector< NullableDatumRef > & record ) const

pure virtual

Evaluate function upon a deserialized record.

Implemented in taco::FuncCallOperator, taco::BinaryOperator, taco::Literal, taco::OrOperator, taco::UnaryOperator, taco::Variable, taco::AndOperator, and taco::Cast.

◆ ReturnType()

std::shared_ptr<const SysTable_Type> taco::ExprNode::ReturnType ( ) const

inline

Derive the return type of this expression.

Member Data Documentation

◆ m_type

std::shared_ptr<const SysTable_Type> taco::ExprNode::m_type

protected

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

expr/ExprNode.h

Public Member Functions

Protected Attributes

Additional Inherited Members