MySQL  8.0.17
Source Code Documentation
in_string Class Referencefinal

#include <item_cmpfunc.h>

Inheritance diagram for in_string:
in_vector

Public Member Functions

 in_string (MEM_ROOT *mem_root, uint elements, const CHARSET_INFO *cs)
 
Item_basic_constantcreate_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 ()
 
virtual bool is_row_result () const
 
bool fill (Item **items, uint item_count)
 Fill the vector by evaluating the items passed as arguments. More...
 

Private Member Functions

void set (uint pos, Item *item) override
 
void resize_and_sort () override
 Resize and then sort the IN-list array, so we can do efficient lookup with binary_search. More...
 

Private Attributes

char buff [STRING_BUFFER_USUAL_SIZE]
 
String tmp
 
Mem_root_array< Stringbase_objects
 
Mem_root_array< String * > base_pointers
 
const CHARSET_INFOcollation
 

Additional Inherited Members

- Public Attributes inherited from in_vector
uint used_count
 The actual size of the vector (NULL may be ignored) More...
 

Constructor & Destructor Documentation

◆ in_string()

in_string::in_string ( MEM_ROOT mem_root,
uint  elements,
const CHARSET_INFO cs 
)

Member Function Documentation

◆ compare_elems()

bool in_string::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_string::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_rootWhere to allocate the Item.

Implements in_vector.

◆ find_item()

bool in_string::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
itemto evaluate, and lookup in the IN-list.
Returns
true if evaluated value of the item was found.

Implements in_vector.

◆ resize_and_sort()

void in_string::resize_and_sort ( )
overrideprivatevirtual

Resize and then sort the IN-list array, so we can do efficient lookup with binary_search.

Implements in_vector.

◆ set()

void in_string::set ( uint  pos,
Item item 
)
overrideprivatevirtual

Implements in_vector.

◆ value_to_item()

void in_string::value_to_item ( uint  pos,
Item_basic_constant item 
) const
inlineoverridevirtual

Store the value at position pos into provided item object.

Parameters
posIndex of value to store
itemConstant 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<String> in_string::base_objects
private

◆ base_pointers

Mem_root_array<String *> in_string::base_pointers
private

◆ buff

char in_string::buff[STRING_BUFFER_USUAL_SIZE]
private

◆ collation

const CHARSET_INFO* in_string::collation
private

◆ tmp

String in_string::tmp
private

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