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subselect with union

Browse source 
new error handling
Item_ref bug fixed


include/mysql_com.h:
  new error handling
  query cache pointer description
mysql-test/r/distinct.result:
  new result's after Monty's bug fixing
mysql-test/r/subselect.result:
  subselect with union test
mysql-test/t/subselect.test:
  subselect with union test
sql/item.cc:
  subselect with union
  Item_ref bug fixed
sql/item_cmpfunc.cc:
  Monty's bug fixing
sql/item_subselect.cc:
  TODO changing
  subselect with union
sql/item_subselect.h:
  subselect with union
sql/mysql_priv.h:
  Item_ref bug fixed
sql/mysqld.cc:
  new error handling
sql/net_pkg.cc:
  new error handling
sql/net_serv.cc:
  new error handling
sql/sql_base.cc:
  Item_ref bug fixed
sql/sql_class.cc:
  new error handling
sql/sql_class.h:
  new error handling
sql/sql_derived.cc:
  subselect with union
sql/sql_insert.cc:
  new error handling (only with mysql_select now)
sql/sql_lex.cc:
  subselect with union
sql/sql_lex.h:
  subselect with union
sql/sql_parse.cc:
  new error handling
sql/sql_select.cc:
  new error handling
  subselect with union
  removed thd->where=0 hack
sql/sql_select.h:
  subselect with union
sql/sql_union.cc:
  subselect with union
sql/sql_update.cc:
  new error handling (only with mysql_select now)
sql/sql_yacc.yy:
  subselect with union
This commit is contained in:
unknown 2002-09-03 09:50:36 +03:00
commit 3fbcafea9c
25 changed files with 658 additions and 354 deletions
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125
sql/item_subselect.h
View file

@ -20,31 +20,25 @@
#pragma interface /* gcc class implementation */
#endif
struct st_select_lex;
class st_select_lex;
class st_select_lex_unit;
class JOIN;
class select_subselect;
class subselect_engine;
/* base class for subselects */
class Item_subselect :public Item
{
my_bool engine_owner; /* Is this item owner of engine */
my_bool value_assigned; /* value already assigned to subselect */
protected:
/* engine that perform execution of subselect (single select or union) */
subselect_engine *engine;
/* allowed number of columns (1 for single value subqueries) */
uint max_columns;
my_bool assigned; /* value already assigned to subselect */
my_bool executed; /* simple subselect is executed */
my_bool optimized; /* simple subselect is optimized */
my_bool error; /* error in query */
int exec();
virtual void assign_null()
{
null_value= 1;
}
public:
st_select_lex *select_lex;
JOIN *join;
select_subselect *result;
Item_subselect(THD *thd, st_select_lex *select_lex,
select_subselect* result);
Item_subselect(Item_subselect *item)
@ -52,14 +46,17 @@ public:
null_value= item->null_value;
decimals= item->decimals;
max_columns= item->max_columns;
assigned= item->assigned;
executed= item->executed;
select_lex= item->select_lex;
join= item->join;
result= item->result;
engine= item->engine;
engine_owner= 0;
name= item->name;
error= item->error;
}
~Item_subselect();
virtual void assign_null()
{
null_value= 1;
}
bool assigned() { return value_assigned; }
void assigned(bool a) { value_assigned= a; }
enum Type type() const;
bool is_null() { return null_value; }
void make_field (Send_field *);
@ -75,18 +72,10 @@ public:
class Item_singleval_subselect :public Item_subselect
{
protected:
longlong int_value;
double real_value;
enum Item_result res_type;
longlong int_value; /* here stored integer value of this item */
double real_value; /* here stored real value of this item */
enum Item_result res_type; /* type of results */
virtual void assign_null()
{
null_value= 1;
int_value= 0;
real_value= 0;
max_length= 4;
res_type= STRING_RESULT;
}
public:
Item_singleval_subselect(THD *thd, st_select_lex *select_lex);
Item_singleval_subselect(Item_singleval_subselect *item):
@ -98,6 +87,14 @@ public:
decimals= item->decimals;
res_type= item->res_type;
}
virtual void assign_null()
{
null_value= 1;
int_value= 0;
real_value= 0;
max_length= 4;
res_type= STRING_RESULT;
}
double val ();
longlong val_int ();
String *val_str (String *);
@ -112,12 +109,8 @@ public:
class Item_exists_subselect :public Item_subselect
{
protected:
longlong value;
longlong value; /* value of this item (boolean: exists/not-exists) */
virtual void assign_null()
{
value= 0;
}
public:
Item_exists_subselect(THD *thd, st_select_lex *select_lex);
Item_exists_subselect(Item_exists_subselect *item):
@ -125,6 +118,11 @@ public:
{
value= item->value;
}
virtual void assign_null()
{
value= 0;
}
Item *new_item() { return new Item_exists_subselect(this); }
enum Item_result result_type() const { return INT_RESULT;}
longlong val_int();
@ -133,3 +131,58 @@ public:
friend class select_exists_subselect;
};
class subselect_engine
{
protected:
select_subselect *result; /* results storage class */
THD *thd; /* pointer to current THD */
Item_subselect *item; /* item, that use this engine */
public:
static void *operator new(size_t size)
{
return (void*) sql_alloc((uint) size);
}
static void operator delete(void *ptr, size_t size) {}
subselect_engine(THD *thd, Item_subselect *si, select_subselect *res)
{
result= res;
item= si;
this->thd= thd;
}
virtual int prepare()= 0;
virtual int exec()= 0;
virtual uint cols()= 0; /* return number of columnss in select */
virtual bool depended()= 0; /* depended from outer select */
};
class subselect_single_select_engine: public subselect_engine
{
my_bool executed; /* simple subselect is executed */
my_bool optimized; /* simple subselect is optimized */
st_select_lex *select_lex; /* corresponding select_lex */
JOIN * join; /* corresponding JOIN structure */
public:
subselect_single_select_engine(THD *thd, st_select_lex *select,
select_subselect *result,
Item_subselect *item);
virtual int prepare();
virtual int exec();
virtual uint cols();
virtual bool depended();
};
class subselect_union_engine: public subselect_engine
{
st_select_lex_unit *unit; /* corresponding unit structure */
public:
subselect_union_engine(THD *thd,
st_select_lex_unit *u,
select_subselect *result,
Item_subselect *item);
virtual int prepare();
virtual int exec();
virtual uint cols();
virtual bool depended();
};