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EXISTS type of subselect

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more correct parameters in result creation script


mysql-test/create-test-result:
  more correct parameters in result creation script
mysql-test/r/subselect.result:
  test of EXISTS
mysql-test/t/subselect.test:
  test of EXISTS
sql/item_subselect.cc:
  EXISTS type of subselect
sql/item_subselect.h:
  EXISTS type of subselect
sql/sql_class.cc:
  EXISTS type of subselect
sql/sql_class.h:
  EXISTS type of subselect
sql/sql_yacc.yy:
  EXISTS type of subselect
This commit is contained in:
unknown 2002-06-19 17:52:44 +03:00
commit c6a2ae17a0
8 changed files with 235 additions and 79 deletions
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89
sql/item_subselect.h
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@ -24,42 +24,34 @@ struct st_select_lex;
class JOIN;
class select_subselect;
/* simple (not depended of covered select ) subselect */
/* base class for subselects */
class Item_subselect :public Item
{
protected:
longlong int_value;
double real_value;
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 */
enum Item_result res_type;
int exec();
void assign_null()
virtual void assign_null()
{
null_value= 1;
int_value= 0;
real_value= 0;
max_length= 4;
res_type= STRING_RESULT;
}
public:
st_select_lex *select_lex;
JOIN *join;
select_subselect *result;
Item_subselect(THD *thd, st_select_lex *select_lex);
Item_subselect(THD *thd, st_select_lex *select_lex,
select_subselect* result);
Item_subselect(Item_subselect *item)
{
null_value= item->null_value;
int_value= item->int_value;
real_value= item->real_value;
max_length= item->max_length;
decimals= item->decimals;
res_type= item->res_type;
max_columns= item->max_columns;
assigned= item->assigned;
executed= item->executed;
select_lex= item->select_lex;
@ -69,16 +61,75 @@ public:
error= item->error;
}
enum Type type() const;
double val ();
longlong val_int ();
String *val_str (String *);
bool is_null() { return null_value; }
void make_field (Send_field *);
bool fix_fields(THD *thd, TABLE_LIST *tables);
Item *new_item() { return new Item_subselect(this); }
enum Item_result result_type() const { return res_type; }
table_map used_tables() const;
friend class select_subselect;
};
/* single value subselect */
class Item_singleval_subselect :public Item_subselect
{
protected:
longlong int_value;
double real_value;
enum Item_result res_type;
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):
Item_subselect(item)
{
int_value= item->int_value;
real_value= item->real_value;
max_length= item->max_length;
decimals= item->decimals;
res_type= item->res_type;
}
double val ();
longlong val_int ();
String *val_str (String *);
Item *new_item() { return new Item_singleval_subselect(this); }
enum Item_result result_type() const { return res_type; }
friend class select_singleval_subselect;
};
/* exists subselect */
class Item_exists_subselect :public Item_subselect
{
protected:
longlong value;
virtual void assign_null()
{
value= 0;
}
public:
Item_exists_subselect(THD *thd, st_select_lex *select_lex);
Item_exists_subselect(Item_exists_subselect *item):
Item_subselect(item)
{
value= item->value;
}
Item *new_item() { return new Item_exists_subselect(this); }
enum Item_result result_type() const { return INT_RESULT;}
longlong val_int();
double val();
String *val_str(String*);
friend class select_exists_subselect;
};