A query expression for nested queries. More...

#include <AST.hpp>

Inheritance diagram for m::ast::QueryExpr:

Collaboration diagram for m::ast::QueryExpr:

Public Member Functions
	QueryExpr (Token op, std::unique_ptr< Stmt > query)

bool	is_constant () const override
	Returns true iff this `Expr` is constant, i.e.

bool	can_be_null () const override
	Returns true iff this `Expr` is nullable, i.e.

bool	contains_free_variables () const override
	Conceptually, `QueryExpr`s have no variables at all.

bool	contains_bound_variables () const override
	Conceptually, `QueryExpr`s have no variables at all.

uint64_t	hash () const override
	Computes a hash of `this`, considering only syntactic properties.

bool	operator== (const Expr &other) const override
	Returns `true` iff `other` is syntactically equal to `this`.

void	accept (ASTExprVisitor &v) override

void	accept (ConstASTExprVisitor &v) const override

const ThreadSafePooledString &	alias () const

const Type *	type () const
	Returns the `Type` of this `Expr`.

void	type (const Type *type)
	Sets the `Type` of this `Expr`.

bool	has_type () const
	Returns true iff this `Expr` has been assigned a `Type`, most likely by `Sema`.

bool	operator!= (const Expr &other) const
	Returns `false` iff `other` is syntactically equal to `this`.

Schema	get_required () const
	Returns a `Schema` instance containing all required definitions.

void	dot (std::ostream &out) const
	Writes a Graphivz dot representation of this `Expr` to `out`.

M_LCOV_EXCL_STOP void	dump (std::ostream &out) const

void	dump () const

Data Fields
std::unique_ptr< Stmt >	query

Token	tok
	the token of the expression; serves as an anchor to locate the expression in the source

Static Private Member Functions
static ThreadSafePooledString	make_unique_alias ()

Private Attributes
ThreadSafePooledString	alias_
	the alias that is used for this query expression

const Type *	type_ = nullptr
	‍the type of an expression, determined by the semantic analysis

bool	is_correlated_ = false
	Whether this `Expr` is correlated within its query, i.e.

Detailed Description

A query expression for nested queries.

Definition at line 388 of file AST.hpp.

Constructor & Destructor Documentation

◆ QueryExpr()

m::ast::QueryExpr::QueryExpr	(	Token	op,
		std::unique_ptr< Stmt >	query
	)

inline

Definition at line 396 of file AST.hpp.

Member Function Documentation

◆ accept() [1/2]

void m::ast::QueryExpr::accept ( ASTExprVisitor & v )

overridevirtual

Implements m::ast::Expr.

◆ accept() [2/2]

void m::ast::QueryExpr::accept ( ConstASTExprVisitor & v ) const

overridevirtual

Implements m::ast::Expr.

◆ alias()

const ThreadSafePooledString & m::ast::QueryExpr::alias ( ) const

inline

Definition at line 421 of file AST.hpp.

Referenced by m::wasm::ExprCompiler::operator()().

◆ can_be_null()

bool QueryExpr::can_be_null ( ) const

overridevirtual

Returns true iff this Expr is nullable, i.e.

may evaluate to NULL at runtime.

Implements m::ast::Expr.

Definition at line 270 of file AST.cpp.

References M_insist, and query.

◆ contains_bound_variables()

bool m::ast::QueryExpr::contains_bound_variables ( ) const

inlineoverridevirtual

Conceptually, QueryExprs have no variables at all.

They only contain another SelectStmt. The correlation of expressions within this SelectStmt does not matter here. Therefore, conceptually, all variables within the QueryExpr are bound and this method always returns true.

Implements m::ast::Expr.

Definition at line 412 of file AST.hpp.

◆ contains_free_variables()

bool m::ast::QueryExpr::contains_free_variables ( ) const

inlineoverridevirtual

Conceptually, QueryExprs have no variables at all.

They only contain another SelectStmt. The correlation of expressions within this SelectStmt does not matter here. Therefore, QueryExprs never have free variables and this method always returns false.

Implements m::ast::Expr.

Definition at line 408 of file AST.hpp.

◆ dot()

void Expr::dot ( std::ostream & out ) const

inherited

Writes a Graphivz dot representation of this Expr to out.

Used to render ASTs with Graphivz.

Definition at line 205 of file AST.cpp.

References m::ast::Expr::dot().

Referenced by m::ast::Expr::dot().

◆ dump() [1/2]

void Expr::dump ( ) const

inherited

Definition at line 235 of file AST.cpp.

References m::ast::Expr::dump().

Referenced by m::ast::Expr::dump().

◆ dump() [2/2]

M_LCOV_EXCL_START void Expr::dump ( std::ostream & out ) const

inherited

Definition at line 229 of file AST.cpp.

◆ get_required()

Schema Expr::get_required ( ) const

inherited

Returns a Schema instance containing all required definitions.

Recursively traverses the Expr to find all Designators. Note, that FnApplicationExprs require special handling: a FnApplicationExpr that is an aggregation is stringified to a Schema::Identifier and not processed further recursively. The reason for this special treatment is that aggregations are performed during grouping and the aggregate value is referenced by the stringified expression (or alias, if given).

Definition at line 145 of file AST.cpp.

References m::Schema::add(), m::Catalog::Get(), m::Schema::has(), id, m::Catalog::pool(), and m::visit().

◆ has_type()

bool m::ast::Expr::has_type ( ) const

inlineinherited

Returns true iff this Expr has been assigned a Type, most likely by Sema.

Definition at line 63 of file AST.hpp.

◆ hash()

uint64_t QueryExpr::hash ( ) const

overridevirtual

Computes a hash of this, considering only syntactic properties.

Other properties are ignored, e.g. type or designator target.

Implements m::ast::Expr.

Definition at line 76 of file AST.cpp.

References query.

◆ is_constant()

M_LCOV_EXCL_STOP bool QueryExpr::is_constant ( ) const

overridevirtual

Returns true iff this Expr is constant, i.e.

consists only of constants and can be evaluated at compilation time.

Implements m::ast::Expr.

Definition at line 259 of file AST.cpp.

References M_insist, and query.

◆ make_unique_alias()

ThreadSafePooledString QueryExpr::make_unique_alias ( )

staticprivate

Definition at line 14 of file AST.cpp.

References m::Catalog::Get(), id, and m::Catalog::pool().

◆ operator!=()

bool m::ast::Expr::operator!= ( const Expr & other ) const

inlineinherited

Returns false iff other is syntactically equal to this.

Definition at line 85 of file AST.hpp.

◆ operator==()

bool QueryExpr::operator== ( const Expr & other ) const

overridevirtual

Returns true iff other is syntactically equal to this.

Implements m::ast::Expr.

Definition at line 133 of file AST.cpp.

References query.

◆ type() [1/2]

const Type * m::ast::Expr::type ( ) const

inlineinherited

Returns the Type of this Expr.

Assumes that the Expr has been assigned a Type by the Sema.

Definition at line 58 of file AST.hpp.

References M_notnull.

Referenced by m::ast::Sema::create_designator(), m::ast::UnaryExpr::hash(), m::ast::BinaryExpr::hash(), index_scan_codegen_compilation(), m::wasm::ExprCompiler::operator()(), and WeighExpr::operator()().

◆ type() [2/2]

void m::ast::Expr::type ( const Type * type )

inlineinherited

Sets the Type of this Expr.

Should be used when constructing an Expr outside of the Sema. Should not be called to replace an already assigned type.

Definition at line 61 of file AST.hpp.

References M_insist, and m::ast::Expr::type().

Referenced by m::ast::Expr::type().

Field Documentation

◆ alias_

ThreadSafePooledString m::ast::QueryExpr::alias_

private

the alias that is used for this query expression

Definition at line 393 of file AST.hpp.

◆ is_correlated_

bool m::ast::Expr::is_correlated_ = false

privateinherited

Whether this Expr is correlated within its query, i.e.

whether this Expr contains free variables that are bound by an outside query.

Definition at line 50 of file AST.hpp.

◆ query

std::unique_ptr<Stmt> m::ast::QueryExpr::query

Definition at line 390 of file AST.hpp.

Referenced by can_be_null(), hash(), is_constant(), and operator==().

◆ tok

Token m::ast::Expr::tok

inherited

the token of the expression; serves as an anchor to locate the expression in the source

Definition at line 43 of file AST.hpp.

Referenced by m::ast::Sema::create_designator(), m::ast::Constant::hash(), m::Interpreter::M_OPERATOR_LIST(), and m::ast::Constant::operator==().

◆ type_

const Type* m::ast::Expr::type_ = nullptr

privateinherited

‍the type of an expression, determined by the semantic analysis

Definition at line 47 of file AST.hpp.

The documentation for this struct was generated from the following files:

include/mutable/parse/AST.hpp
src/parse/AST.cpp

Public Member Functions

Data Fields

Static Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ QueryExpr()

Member Function Documentation

◆ accept() [1/2]

◆ accept() [2/2]

◆ alias()

◆ can_be_null()

◆ contains_bound_variables()

◆ contains_free_variables()

◆ dot()

◆ dump() [1/2]

◆ dump() [2/2]

◆ get_required()

◆ has_type()

◆ hash()

◆ is_constant()

◆ make_unique_alias()

◆ operator!=()

◆ operator==()

◆ type() [1/2]

◆ type() [2/2]

Field Documentation

◆ alias_

◆ is_correlated_

◆ query

◆ tok

◆ type_