cmp_item Class Reference

#include <item_cmpfunc.h>

Inheritance diagram for cmp_item:

Public Member Functions
	cmp_item ()=default
virtual	~cmp_item ()=default
virtual bool	allocate_value_comparators (MEM_ROOT *mem_root, cmp_item *tmpl, Item *arg)
	Allocate comparator objects for each value object, based on the template comparator objects. More...
virtual void	store_value (Item *item)=0
virtual int	cmp (Item *item)=0
virtual int	compare (const cmp_item *item) const =0
virtual cmp_item *	make_same ()=0
virtual void	store_value_by_template (cmp_item *, Item *item)

Static Public Member Functions
static cmp_item *	new_comparator (THD *thd, Item_result result_type, Item *item, const CHARSET_INFO *cs)
	Create an appropriate comparator for the given type. More...

Constructor & Destructor Documentation

cmp_item()

cmp_item::cmp_item ( )

default

~cmp_item()

virtual cmp_item::~cmp_item ( )

virtualdefault

Member Function Documentation

allocate_value_comparators()

bool cmp_item::allocate_value_comparators ( MEM_ROOT *  mem_root, cmp_item *  tmpl, Item *  arg  )

virtual

Allocate comparator objects for each value object, based on the template comparator objects.

Only implemented for derived class cmp_item_row.

Parameters

mem_root	mem_root for allocation.
tmpl	The template item object.
arg	The value item.

Returns

false if success, true if error.

Reimplemented in cmp_item_row.

cmp()

virtual int cmp_item::cmp ( Item *  item )

pure virtual

Returns

result (true, false or UNKNOWN) of "stored argument's value <> item's value"

Implemented in cmp_item_string, cmp_item_json, cmp_item_int, cmp_item_datetime, cmp_item_real, cmp_item_decimal, and cmp_item_row.

compare()

virtual int cmp_item::compare ( const cmp_item *  item ) const

pure virtual

Implemented in cmp_item_row, cmp_item_decimal, cmp_item_string, cmp_item_json, cmp_item_int, cmp_item_datetime, and cmp_item_real.

make_same()

virtual cmp_item * cmp_item::make_same ( )

pure virtual

Implemented in cmp_item_string, cmp_item_json, cmp_item_int, cmp_item_datetime, cmp_item_real, cmp_item_decimal, and cmp_item_row.

new_comparator()

cmp_item * cmp_item::new_comparator ( THD *  thd, Item_result  result_type, Item *  item, const CHARSET_INFO *  cs  )

static

Create an appropriate comparator for the given type.

Parameters

thd	Session handle.
result_type	Used to find the appropriate comparator.
item	Item object used to distinguish temporal types.
cs	Charset

Returns

new cmp_item_xxx object, or nullptr if error.

store_value()

virtual void cmp_item::store_value ( Item *  item )

pure virtual

Implemented in cmp_item_string, cmp_item_json, cmp_item_int, cmp_item_datetime, cmp_item_real, cmp_item_decimal, and cmp_item_row.

store_value_by_template()

virtual void cmp_item::store_value_by_template ( cmp_item *  , Item *  item  )

inlinevirtual

Reimplemented in cmp_item_row.

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

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