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new SELECT_LEX structure

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mysql-test/r/derived.result:
  derived table bug test
mysql-test/t/derived.test:
  derived table bug test
sql/mysql_priv.h:
  new mysql_new_select call & layout fixing
sql/sql_class.h:
  passing unit as parameter of Table_ident constructor
sql/sql_lex.cc:
  new SELECT_LEX structure methods
sql/sql_lex.h:
  new SELECT_LEX structure definition
sql/table.h:
  fixed layout
This commit is contained in:
unknown
2002-05-07 00:04:16 +03:00
parent 234dc3a35e
commit 2c62a868a6
11 changed files with 372 additions and 111 deletions
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149
sql/sql_lex.h
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@ -103,28 +103,143 @@ typedef struct st_lex_master_info
} LEX_MASTER_INFO;
enum sub_select_type {UNSPECIFIED_TYPE,UNION_TYPE, INTERSECT_TYPE, EXCEPT_TYPE, NOT_A_SELECT, DERIVED_TABLE_TYPE};
enum sub_select_type {UNSPECIFIED_TYPE,UNION_TYPE, INTERSECT_TYPE,
EXCEPT_TYPE, GLOBAL_OPTIONS_TYPE, DERIVED_TABLE_TYPE};
/* The state of the lex parsing for selects */
/*
The state of the lex parsing for selects
All select describing structures linked with following pointers:
- list of neighbors (next/prev) (prev of first element point to slave
pointer of upper structure)
- one level units for unit (union) structure
- member of one union(unit) for ordinary select_lex
- pointer to master
- outer select_lex for unit (union)
- unit structure for ordinary select_lex
- pointer to slave
- first list element of select_lex belonged to this unit for unit
- first unit in list of units that belong to this select_lex (as
subselects or derived tables) for ordinary select_lex
- list of all select_lex (for group operation like correcting list of opened
tables)
for example for following query:
typedef struct st_select_lex {
select *
from table1
where table1.field IN (select * from table1_1_1 union
select * from table1_1_2)
union
select *
from table2
where table2.field=(select (select f1 from table2_1_1_1_1
where table2_1_1_1_1.f2=table2_1_1.f3)
from table2_1_1
where table2_1_1.f1=table2.f2)
union
select * from table3;
we will have following structure:
main unit
select1 select2 select3
|^^ |^
s||| ||master
l||| |+---------------------------------+
a||| +---------------------------------+|
v|||master slave ||
e||+-------------------------+ ||
V| neighbor | V|
unit 1.1<==================>unit1.2 unit2.1
select1.1.1 select 1.1.2 select1.2.1 select2.1.1 select2.1.2
|^
||
V|
unit2.1.1.1
select2.1.1.1.1
relation in main unit will be following:
main unit
|^^^
||||
|||+------------------------------+
||+--------------+ |
slave||master | |
V| neighbor | neighbor |
select1<========>select2<========>select3
list of all select_lex will be following (as it will be constructed by
parser):
select1->select2->select3->select2.1.1->select 2.1.2->select2.1.1.1.1-+
|
+---------------------------------------------------------------------+
|
+->select1.1.1->select1.1.2
*/
/*
Base class for st_select_lex (SELECT_LEX) &
st_select_lex_unit (SELECT_LEX_UNIT)
*/
struct st_select_lex_node {
enum sub_select_type linkage;
char *db,*db1,*table1,*db2,*table2; /* For outer join using .. */
Item *where,*having;
ha_rows select_limit,offset_limit;
st_select_lex_node *next, **prev, /* neighbor list */
*master, *slave, /* vertical links */
*link_next, **link_prev; /* list of whole SELECT_LEX */
SQL_LIST order_list; /* ORDER clause */
ha_rows select_limit, offset_limit; /* LIMIT clause parameters */
void init_query();
void init_select();
void include_down(st_select_lex_node *upper);
void include_neighbour(st_select_lex_node *before);
void include_global(st_select_lex_node **plink);
void exclude();
private:
void fast_exclude();
};
/*
SELECT_LEX_UNIT - unit of selects (UNION, INTERSECT, ...) group
SELECT_LEXs
*/
struct st_select_lex_unit: public st_select_lex_node {
/*
Pointer to 'last' select or pointer to unit where stored
global parameters for union
*/
st_select_lex_node *global_parameters;
/* LIMIT clause runtime counters */
ha_rows select_limit_cnt, offset_limit_cnt;
void init_query();
};
typedef struct st_select_lex_unit SELECT_LEX_UNIT;
/*
SELECT_LEX - store information of parsed SELECT_LEX statment
*/
struct st_select_lex: public st_select_lex_node {
char *db, *db1, *table1, *db2, *table2; /* For outer join using .. */
Item *where, *having; /* WHERE & HAVING clauses */
ulong options;
List<List_item> expr_list;
List<List_item> when_list;
SQL_LIST order_list,table_list,group_list;
List<Item> item_list;
List<String> interval_list,use_index, *use_index_ptr,
List<List_item> when_list; /* WHEN clause */
SQL_LIST table_list, group_list; /* FROM & GROUP BY clauses */
List<Item> item_list; /* list of fields & expressions */
List<String> interval_list, use_index, *use_index_ptr,
ignore_index, *ignore_index_ptr;
List<Item_func_match> ftfunc_list;
uint in_sum_expr, sort_default;
bool create_refs, braces;
st_select_lex *next, *prev;
} SELECT_LEX;
bool create_refs,
braces; /* SELECT ... UNION (SELECT ... ) <- this braces */
void init_query();
void init_select();
};
typedef struct st_select_lex SELECT_LEX;
class Set_option :public Sql_alloc {
public:
@ -137,13 +252,15 @@ public:
:name(par_name), item(par_item), name_length(length), type(par_type) {}
};
/* The state of the lex parsing. This is saved in the THD struct */
typedef struct st_lex {
uint yylineno,yytoklen; /* Simulate lex */
LEX_YYSTYPE yylval;
SELECT_LEX select_lex, *select, *last_select;
SELECT_LEX_UNIT unit; /* most upper unit */
SELECT_LEX select_lex, /* first SELECT_LEX */
/* current SELECT_LEX in parsing */
*select;
uchar *ptr,*tok_start,*tok_end,*end_of_query;
char *length,*dec,*change,*name;
char *backup_dir; /* For RESTORE/BACKUP */