in_double Class Reference

#include <item_cmpfunc.h>

Inheritance diagram for in_double:

Public Member Functions
	in_double (MEM_ROOT *mem_root, uint elements)
Item_basic_constant *	create_item (MEM_ROOT *mem_root) const override
	Create an instance of Item_{type} (e.g. More...
void	value_to_item (uint pos, Item_basic_constant *item) const override
	Store the value at position pos into provided item object. 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...
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
virtual bool	is_row_result () const
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
Mem_root_array< double >	base

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_double()

in_double::in_double ( MEM_ROOT *  mem_root, uint  elements  )

inline

Member Function Documentation

compare_elems()

bool in_double::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_double::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_double::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.

set()

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

overrideprivatevirtual

Implements in_vector.

sort_array()

void in_double::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_double::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

Mem_root_array<double> in_double::base

private

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

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