Semijoin_decorrelation Class Reference

Context object used by semijoin equality decorrelation code. More...

Public Member Functions
	Semijoin_decorrelation (mem_root_deque< Item * > *sj_outer_exprs_arg, mem_root_deque< Item * > *sj_inner_exprs_arg, Mem_root_array< Item_func::Functype > *op_types_arg)
void	add_outer (Item *i)
void	add_inner (Item *i)
bool	decorrelate_only_eq () const
bool	add_op_type (Item_func::Functype op_type)
Item_func::Functype	op_type_at (int j) const

Private Attributes
mem_root_deque< Item * > *	sj_outer_exprs
mem_root_deque< Item * > *	sj_inner_exprs
Mem_root_array< Item_func::Functype > *	op_types
	If nullptr: only a=b is decorrelated. More...

Detailed Description

Context object used by semijoin equality decorrelation code.

Constructor & Destructor Documentation

Semijoin_decorrelation()

Semijoin_decorrelation::Semijoin_decorrelation ( mem_root_deque< Item * > *  sj_outer_exprs_arg, mem_root_deque< Item * > *  sj_inner_exprs_arg, Mem_root_array< Item_func::Functype > *  op_types_arg  )

inline

Member Function Documentation

add_inner()

void Semijoin_decorrelation::add_inner ( Item *  i )

inline

add_op_type()

bool Semijoin_decorrelation::add_op_type ( Item_func::Functype  op_type )

inline

add_outer()

void Semijoin_decorrelation::add_outer ( Item *  i )

inline

decorrelate_only_eq()

bool Semijoin_decorrelation::decorrelate_only_eq ( ) const

inline

op_type_at()

Item_func::Functype Semijoin_decorrelation::op_type_at ( int  j ) const

inline

Member Data Documentation

op_types

Mem_root_array<Item_func::Functype>* Semijoin_decorrelation::op_types

private

If nullptr: only a=b is decorrelated.

Otherwise, a OP b is decorrelated for OP in <>, >=, >, <=, <, and for each decorrelated SJ outer/inner pair, located at position N in sj_outer_exprs and sj_inner_exprs, we store, at the same position in op_types, the operator's type code representing "outer OP inner" (for example, LE_FUNC for outer<=inner as well as inner>=outer).

sj_inner_exprs

mem_root_deque<Item *> * Semijoin_decorrelation::sj_inner_exprs

private

sj_outer_exprs

mem_root_deque<Item *>* Semijoin_decorrelation::sj_outer_exprs

private

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

• sql/sql_resolver.cc