MySQL 8.4.0
Source Code Documentation
in_double Class Referencefinal

#include <item_cmpfunc.h>

Inheritance diagram for in_double:

Public Member Functions

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

Member Function Documentation

◆ compare_elems()

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

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

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)

mem_rootWhere to allocate the Item.

Implements in_vector.

◆ find_item()

bool in_double::find_item ( Item item)

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

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

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

Implements in_vector.

◆ set()

void in_double::set ( uint  pos,
Item item 

Implements in_vector.

◆ sort_array()

void in_double::sort_array ( )

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

Store the value at position pos into provided item object.

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

Mem_root_array<double> in_double::base

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