in_row Class Reference

#include <item_cmpfunc.h>

Inheritance diagram for in_row:

Public Member Functions
	in_row (MEM_ROOT *mem_root, uint elements, cmp_item_row *cmp)
bool	is_row_result () const override
bool	allocate (MEM_ROOT *mem_root, Item *lhs, uint arg_count)
	Allocate extra objects for evaluation. More...
bool	find_item (Item *item) override
	Calls item->val_int() or item->val_str() etc. More...
bool	compare_elems (uint pos1, uint pos2) const override
	Compare values number pos1 and pos2 for equality. More...
Item_basic_constant *	create_item (MEM_ROOT *) const override
	Create an instance of Item_{type} (e.g. More...
void	value_to_item (uint, Item_basic_constant *) const override
	Store the value at position pos into provided item object. More...
Public Member Functions inherited from in_vector
	in_vector (uint elements)
	See Item_func_in::resolve_type() for why we need both count and used_count. More...
virtual	~in_vector ()=default
bool	fill (Item **items, uint item_count)
	Fill the vector by evaluating the items passed as arguments. More...
virtual void	cleanup ()

Private Member Functions
void	set (uint pos, Item *item) override
void	sort_array () override
	Sort the IN-list array, so we can do efficient lookup with binary_search. More...

Private Attributes
unique_ptr_destroy_only< cmp_item_row >	tmp
Mem_root_array< cmp_item_row >	base_objects
Mem_root_array< cmp_item_row * >	base_pointers

Additional Inherited Members
Public Attributes inherited from in_vector
uint	m_used_size {0}
	The actual size of the vector (NULL may be ignored) More...

Constructor & Destructor Documentation

in_row()

in_row::in_row	(	MEM_ROOT *	mem_root,
		uint	elements,
		cmp_item_row *	cmp
	)

Member Function Documentation

allocate()

bool in_row::allocate	(	MEM_ROOT *	mem_root,
		Item *	lhs,
		uint	arg_count
	)

Allocate extra objects for evaluation.

Parameters

mem_root	Memory root for allocation.
lhs	The left-hand side object of the IN predicate.
arg_count	Number of arguments on the right-hand side of the predicate

Returns

false if success, true if error.

compare_elems()

bool in_row::compare_elems ( uint  pos1, uint  pos2  ) const

overridevirtual

Compare values number pos1 and pos2 for equality.

Implements in_vector.

create_item()

Item_basic_constant * in_row::create_item ( MEM_ROOT *  mem_root ) const

inlineoverridevirtual

Create an instance of Item_{type} (e.g.

Item_decimal) constant object which type allows it to hold an element of this vector without any conversions. The purpose of this function is to be able to get elements of this vector in form of Item_xxx constants without creating Item_xxx object for every array element you get (i.e. this implements "FlyWeight" pattern)

Parameters

mem_root

Where to allocate the Item.

Implements in_vector.

find_item()

bool in_row::find_item ( Item *  item )

overridevirtual

Calls item->val_int() or item->val_str() etc.

and then does binary_search if the value is non-null.

Parameters

item	to evaluate, and lookup in the IN-list.

Returns

true if evaluated value of the item was found.

Implements in_vector.

is_row_result()

bool in_row::is_row_result ( ) const

inlineoverridevirtual

Reimplemented from in_vector.

set()

void in_row::set ( uint  pos, Item *  item  )

overrideprivatevirtual

Implements in_vector.

sort_array()

void in_row::sort_array ( )

overrideprivatevirtual

Sort the IN-list array, so we can do efficient lookup with binary_search.

Implements in_vector.

value_to_item()

void in_row::value_to_item ( uint  pos, Item_basic_constant *  item  ) const

inlineoverridevirtual

Store the value at position pos into provided item object.

Parameters

pos	Index of value to store
item	Constant item to store value into. The item must be of the same type that create_item() returns.

Implements in_vector.

Member Data Documentation

base_objects

Mem_root_array<cmp_item_row> in_row::base_objects

private

base_pointers

Mem_root_array<cmp_item_row *> in_row::base_pointers

private

tmp

unique_ptr_destroy_only<cmp_item_row> in_row::tmp

private

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

• sql/item_cmpfunc.h
• sql/item_cmpfunc.cc