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This ChangeSet Introdices Item_equal.

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The objects of this class represent multiple conjunctive equalities
in where conditions: =(f1,f2,...fn) <=> f1=f2 and f2= ... and =fn.
The objects are used to generate new possibale paths to access
the tables when executing a query.
They are also used to optimize the execution plan 
chosen by the optimizer for the query.  


sql/item.cc:
  Introduced Item_equal
sql/item.h:
  Introduced Item_equal.
  Added traverse method.
sql/item_cmpfunc.cc:
  Introduced Item_equal.
  Added traverse mehtod.
sql/item_cmpfunc.h:
  Itroduced Item_equal and Item_equal_iterator.
sql/item_func.cc:
  Added traverse method.
  Introduced Item_equal.
sql/item_func.h:
  Introduced Item_equal.
  Added traverse method.
sql/item_row.cc:
  Added traverse method.
sql/item_row.h:
  Added traverse method.
sql/item_strfunc.h:
  Added traverse method.
sql/opt_range.cc:
  Used Item_equal in range analysis.
sql/opt_sum.cc:
  Introduced Item_equal.
sql/sql_list.h:
  Added concat and disjoin methods to lists.
  Fixed remove method for lists.
sql/sql_select.cc:
  Introdiced Item_equal:
    created Item_equal;
    used Item_equal objects to generate new paths to access tables.
    used Item_equal objects to optimize the execution plan chosen by optimizer.
sql/sql_select.h:
  Introduced Item_equal.
This commit is contained in:
unknown
2003-11-26 17:23:52 -08:00
parent afe2186e3b
commit da566c16c0
14 changed files with 1394 additions and 106 deletions
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34
sql/sql_list.h
View File

@@ -121,10 +121,12 @@ public:
void remove(list_node **prev)
{
list_node *node=(*prev)->next;
delete *prev;
*prev=node;
if (!--elements)
last= &first;
else if (last == &(*prev)->next)
last= prev;
delete *prev;
*prev=node;
}
inline void *pop(void)
{
@@ -135,6 +137,30 @@ public:
last= &first;
return tmp->info;
}
inline void concat(base_list *list)
{
if (!list->is_empty())
{
*last= list->first;
last= list->last;
elements+= list->elements;
}
}
inline void disjoin(base_list *list)
{
list_node **prev= &first;
list_node *node= first;
list_node *list_first= list->first;
elements=0;
while (node && node != list_first)
{
prev= &node->next;
node= node->next;
elements++;
}
*prev= *last;
last= prev;
}
inline list_node* last_node() { return *last; }
inline list_node* first_node() { return first;}
inline void *head() { return first->info; }
@@ -245,6 +271,8 @@ public:
inline T* head() {return (T*) base_list::head(); }
inline T** head_ref() {return (T**) base_list::head_ref(); }
inline T* pop() {return (T*) base_list::pop(); }
inline void concat(List<T> *list) { return base_list::concat(list); }
inline void disjoin(List<T> *list) { return base_list::disjoin(list); }
void delete_elements(void)
{
list_node *element,*next;
@@ -265,6 +293,8 @@ public:
inline T* operator++(int) { return (T*) base_list_iterator::next(); }
inline T *replace(T *a) { return (T*) base_list_iterator::replace(a); }
inline T *replace(List<T> &a) { return (T*) base_list_iterator::replace(a); }
inline void rewind(void) { base_list_iterator::rewind(); }
inline void remove() { base_list_iterator::remove(); }
inline void after(T *a) { base_list_iterator::after(a); }
inline T** ref(void) { return (T**) base_list_iterator::ref(); }
};