MySQL 8.4.0
Source Code Documentation
in_row Class Referencefinal

#include <item_cmpfunc.h>

Inheritance diagram for in_row:

Public Member Functions

 in_row (MEM_ROOT *mem_root, uint elements, cmp_item_row *cmp)
bool is_row_result () const override
bool allocate (MEM_ROOT *mem_root, Item *lhs, uint arg_count)
 Allocate extra objects for evaluation. 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...
Item_basic_constantcreate_item (MEM_ROOT *) const override
 Create an instance of Item_{type} (e.g. More...
void value_to_item (uint, Item_basic_constant *) const override
 Store the value at position pos into provided item object. 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
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

unique_ptr_destroy_only< cmp_item_rowtmp
Mem_root_array< cmp_item_rowbase_objects
Mem_root_array< cmp_item_row * > base_pointers

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_row()

in_row::in_row ( MEM_ROOT mem_root,
uint  elements,
cmp_item_row cmp 

Member Function Documentation

◆ allocate()

bool in_row::allocate ( MEM_ROOT mem_root,
Item lhs,
uint  arg_count 

Allocate extra objects for evaluation.

mem_rootMemory root for allocation.
lhsThe left-hand side object of the IN predicate.
arg_countNumber of arguments on the right-hand side of the predicate
false if success, true if error.

◆ compare_elems()

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

Compare values number pos1 and pos2 for equality.

Implements in_vector.

◆ create_item()

Item_basic_constant * in_row::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_row::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.

◆ is_row_result()

bool in_row::is_row_result ( ) const

Reimplemented from in_vector.

◆ set()

void in_row::set ( uint  pos,
Item item 

Implements in_vector.

◆ sort_array()

void in_row::sort_array ( )

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

Implements in_vector.

◆ value_to_item()

void in_row::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_objects

Mem_root_array<cmp_item_row> in_row::base_objects

◆ base_pointers

Mem_root_array<cmp_item_row *> in_row::base_pointers

◆ tmp

unique_ptr_destroy_only<cmp_item_row> in_row::tmp

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