in_vector Class Reference

#include <item_cmpfunc.h>

Inheritance diagram for in_vector:

Public Member Functions
	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	find_item (Item *item)=0
	Calls item->val_int() or item->val_str() etc. More...
virtual Item_basic_constant *	create_item (MEM_ROOT *mem_root) const =0
	Create an instance of Item_{type} (e.g. More...
virtual void	value_to_item (uint pos, Item_basic_constant *item) const =0
	Store the value at position pos into provided item object. More...
virtual bool	compare_elems (uint pos1, uint pos2) const =0
	Compare values number pos1 and pos2 for equality. More...
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 ()

Public Attributes
uint	m_used_size {0}
	The actual size of the vector (NULL may be ignored) More...

Private Member Functions
virtual void	set (uint pos, Item *item)=0
virtual void	sort_array ()=0
	Sort the IN-list array, so we can do efficient lookup with binary_search. More...

Private Attributes
const uint	m_size
	Size of the vector. More...

Constructor & Destructor Documentation

in_vector()

in_vector::in_vector ( uint  elements )

inlineexplicit

See Item_func_in::resolve_type() for why we need both count and used_count.

~in_vector()

virtual in_vector::~in_vector ( )

virtualdefault

Member Function Documentation

cleanup()

virtual void in_vector::cleanup ( )

inlinevirtual

Reimplemented in in_string.

compare_elems()

virtual bool in_vector::compare_elems ( uint  pos1, uint  pos2  ) const

pure virtual

Compare values number pos1 and pos2 for equality.

Implemented in in_string, in_longlong, in_double, in_decimal, and in_row.

create_item()

virtual Item_basic_constant * in_vector::create_item ( MEM_ROOT *  mem_root ) const

pure virtual

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.

Implemented in in_row, in_string, in_longlong, in_datetime_as_longlong, in_time_as_longlong, in_datetime, in_double, and in_decimal.

fill()

bool in_vector::fill	(	Item **	items,
		uint	item_count
	)

Fill the vector by evaluating the items passed as arguments.

Note that null values are skipped so the vector may end up containing fewer elements than the number of items. The vector is sorted so that it can be used for binary search.

Parameters

items	Items to evaluate
item_count	Number of items

Returns

true if any null values was found, false otherwise.

find_item()

virtual bool in_vector::find_item ( Item *  item )

pure virtual

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.

Implemented in in_string, in_longlong, in_double, in_decimal, and in_row.

is_row_result()

virtual bool in_vector::is_row_result ( ) const

inlinevirtual

Reimplemented in in_row.

set()

virtual void in_vector::set ( uint  pos, Item *  item  )

privatepure virtual

Implemented in in_string, in_longlong, in_datetime, in_double, in_decimal, and in_row.

sort_array()

virtual void in_vector::sort_array ( )

privatepure virtual

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

Implemented in in_string, in_longlong, in_double, in_decimal, and in_row.

value_to_item()

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

pure virtual

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.

Implemented in in_string, in_longlong, in_double, in_decimal, and in_row.

Member Data Documentation

m_size

const uint in_vector::m_size

private

Size of the vector.

m_used_size

uint in_vector::m_used_size {0}

The actual size of the vector (NULL may be ignored)

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

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