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Kirill Smelkov
mariadb
Commits
d96c670c
Commit
d96c670c
authored
Nov 09, 2002
by
Sinisa@sinisa.nasamreza.org
Browse files
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Plain Diff
Some code optimisations related to EXPLAIN of derived tables and the
resulting code cleanup in our main loop.
parent
bd6f8e0b
Changes
6
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Showing
6 changed files
with
37 additions
and
90 deletions
+37
-90
mysql-test/r/subselect.result
mysql-test/r/subselect.result
+1
-1
sql/mysql_priv.h
sql/mysql_priv.h
+1
-2
sql/sql_derived.cc
sql/sql_derived.cc
+5
-5
sql/sql_lex.cc
sql/sql_lex.cc
+1
-0
sql/sql_parse.cc
sql/sql_parse.cc
+26
-81
sql/sql_select.cc
sql/sql_select.cc
+3
-1
No files found.
mysql-test/r/subselect.result
View file @
d96c670c
...
@@ -71,8 +71,8 @@ select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
...
@@ -71,8 +71,8 @@ select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
explain select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
explain select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from
(select * from t2 where a>1) as tt;
(select * from t2 where a>1) as tt;
id select_type table type possible_keys key key_len ref rows Extra
id select_type table type possible_keys key key_len ref rows Extra
3 DERIVED t2 ALL NULL NULL NULL NULL 2 where used
1 PRIMARY <derived3> system NULL NULL NULL NULL 1
1 PRIMARY <derived3> system NULL NULL NULL NULL 1
3 DERIVED t2 ALL NULL NULL NULL NULL 2 where used
2 SUBSELECT t3 ALL NULL NULL NULL NULL 3 where used; Using filesort
2 SUBSELECT t3 ALL NULL NULL NULL NULL 3 where used; Using filesort
select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3) order by 1 desc limit 1);
select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3) order by 1 desc limit 1);
a
a
...
...
sql/mysql_priv.h
View file @
d96c670c
...
@@ -399,8 +399,7 @@ int mysql_explain_union(THD *thd, SELECT_LEX_UNIT *unit,
...
@@ -399,8 +399,7 @@ int mysql_explain_union(THD *thd, SELECT_LEX_UNIT *unit,
int
mysql_explain_select
(
THD
*
thd
,
SELECT_LEX
*
sl
,
char
const
*
type
,
int
mysql_explain_select
(
THD
*
thd
,
SELECT_LEX
*
sl
,
char
const
*
type
,
select_result
*
result
);
select_result
*
result
);
int
mysql_union
(
THD
*
thd
,
LEX
*
lex
,
select_result
*
result
);
int
mysql_union
(
THD
*
thd
,
LEX
*
lex
,
select_result
*
result
);
int
mysql_derived
(
THD
*
thd
,
LEX
*
lex
,
SELECT_LEX_UNIT
*
s
,
TABLE_LIST
*
t
,
int
mysql_derived
(
THD
*
thd
,
LEX
*
lex
,
SELECT_LEX_UNIT
*
s
,
TABLE_LIST
*
t
);
bool
tables_is_opened
);
Field
*
create_tmp_field
(
THD
*
thd
,
TABLE
*
table
,
Item
*
item
,
Item
::
Type
type
,
Field
*
create_tmp_field
(
THD
*
thd
,
TABLE
*
table
,
Item
*
item
,
Item
::
Type
type
,
Item_result_field
***
copy_func
,
Field
**
from_field
,
Item_result_field
***
copy_func
,
Field
**
from_field
,
bool
group
,
bool
modify_item
);
bool
group
,
bool
modify_item
);
...
...
sql/sql_derived.cc
View file @
d96c670c
...
@@ -28,8 +28,7 @@
...
@@ -28,8 +28,7 @@
static
const
char
*
any_db
=
"*any*"
;
// Special symbol for check_access
static
const
char
*
any_db
=
"*any*"
;
// Special symbol for check_access
int
mysql_derived
(
THD
*
thd
,
LEX
*
lex
,
SELECT_LEX_UNIT
*
unit
,
TABLE_LIST
*
t
,
int
mysql_derived
(
THD
*
thd
,
LEX
*
lex
,
SELECT_LEX_UNIT
*
unit
,
TABLE_LIST
*
t
)
bool
tables_is_opened
)
{
{
/*
/*
TODO: make derived tables with union inside (now only 1 SELECT may be
TODO: make derived tables with union inside (now only 1 SELECT may be
...
@@ -58,7 +57,7 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t,
...
@@ -58,7 +57,7 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t,
if
(
cursor
->
derived
)
if
(
cursor
->
derived
)
{
{
res
=
mysql_derived
(
thd
,
lex
,
(
SELECT_LEX_UNIT
*
)
cursor
->
derived
,
res
=
mysql_derived
(
thd
,
lex
,
(
SELECT_LEX_UNIT
*
)
cursor
->
derived
,
cursor
,
0
);
cursor
);
if
(
res
)
DBUG_RETURN
(
res
);
if
(
res
)
DBUG_RETURN
(
res
);
}
}
}
}
...
@@ -68,7 +67,7 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t,
...
@@ -68,7 +67,7 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t,
while
((
item
=
it
++
))
while
((
item
=
it
++
))
item_list
.
push_back
(
item
);
item_list
.
push_back
(
item
);
if
(
tables_is_opened
||
!
(
res
=
open_and_lock_tables
(
thd
,
tables
)))
if
(
!
(
res
=
open_and_lock_tables
(
thd
,
tables
)))
{
{
if
(
setup_fields
(
thd
,
tables
,
item_list
,
0
,
0
,
1
))
if
(
setup_fields
(
thd
,
tables
,
item_list
,
0
,
0
,
1
))
{
{
...
@@ -112,6 +111,7 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t,
...
@@ -112,6 +111,7 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t,
t
->
real_name
=
table
->
real_name
;
t
->
real_name
=
table
->
real_name
;
t
->
table
=
table
;
t
->
table
=
table
;
table
->
derived_select_number
=
sl
->
select_number
;
table
->
derived_select_number
=
sl
->
select_number
;
if
(
!
lex
->
describe
)
sl
->
exclude
();
sl
->
exclude
();
t
->
db
=
(
tables
&&
tables
->
db
&&
tables
->
db
[
0
])
?
t
->
db
:
thd
->
db
;
t
->
db
=
(
tables
&&
tables
->
db
&&
tables
->
db
[
0
])
?
t
->
db
:
thd
->
db
;
t
->
derived
=
(
SELECT_LEX
*
)
0
;
// just in case ...
t
->
derived
=
(
SELECT_LEX
*
)
0
;
// just in case ...
...
...
sql/sql_lex.cc
View file @
d96c670c
...
@@ -959,6 +959,7 @@ void st_select_lex::init_query()
...
@@ -959,6 +959,7 @@ void st_select_lex::init_query()
table_list
.
next
=
(
byte
**
)
&
table_list
.
first
;
table_list
.
next
=
(
byte
**
)
&
table_list
.
first
;
item_list
.
empty
();
item_list
.
empty
();
join
=
0
;
join
=
0
;
olap
=
UNSPECIFIED_OLAP_TYPE
;
}
}
void
st_select_lex
::
init_select
()
void
st_select_lex
::
init_select
()
...
...
sql/sql_parse.cc
View file @
d96c670c
...
@@ -1328,68 +1328,18 @@ mysql_execute_command(THD *thd)
...
@@ -1328,68 +1328,18 @@ mysql_execute_command(THD *thd)
#endif
#endif
}
}
select_result
*
explain_result
=
0
;
/*
/*
TODO: make derived tables processing 'inside' SELECT processing.
TODO: make derived tables processing 'inside' SELECT processing.
TODO: solve problem with depended derived tables in subselects
TODO: solve problem with depended derived tables in subselects
*/
*/
if
(
lex
->
sql_command
==
SQLCOM_SELECT
&&
if
(
lex
->
derived_tables
)
lex
->
describe
&&
lex
->
derived_tables
)
{
if
(
!
(
explain_result
=
new
select_send
()))
{
send_error
(
thd
,
ER_OUT_OF_RESOURCES
);
DBUG_VOID_RETURN
;
}
//check rights
for
(
cursor
=
tables
;
cursor
;
cursor
=
cursor
->
next
)
if
(
cursor
->
derived
)
{
TABLE_LIST
*
tables
=
(
TABLE_LIST
*
)((
SELECT_LEX_UNIT
*
)
cursor
->
derived
)
->
first_select
()
->
table_list
.
first
;
int
res
;
if
(
tables
)
res
=
check_table_access
(
thd
,
SELECT_ACL
,
tables
);
else
res
=
check_access
(
thd
,
SELECT_ACL
,
any_db
);
if
(
res
)
DBUG_VOID_RETURN
;
}
thd
->
send_explain_fields
(
explain_result
);
// EXPLAIN derived tables
for
(
cursor
=
tables
;
cursor
;
cursor
=
cursor
->
next
)
if
(
cursor
->
derived
)
{
SELECT_LEX
*
select_lex
=
((
SELECT_LEX_UNIT
*
)
cursor
->
derived
)
->
first_select
();
if
(
!
open_and_lock_tables
(
thd
,
(
TABLE_LIST
*
)
select_lex
->
table_list
.
first
))
{
mysql_explain_select
(
thd
,
select_lex
,
"DERIVED"
,
explain_result
);
// execute derived table SELECT to provide table for other SELECTs
if
(
mysql_derived
(
thd
,
lex
,
(
SELECT_LEX_UNIT
*
)
cursor
->
derived
,
cursor
,
1
))
DBUG_VOID_RETURN
;
}
else
DBUG_VOID_RETURN
;
}
}
else
if
(
lex
->
derived_tables
)
{
{
for
(
TABLE_LIST
*
cursor
=
tables
;
for
(
TABLE_LIST
*
cursor
=
tables
;
cursor
;
cursor
;
cursor
=
cursor
->
next
)
cursor
=
cursor
->
next
)
if
(
cursor
->
derived
&&
(
res
=
mysql_derived
(
thd
,
lex
,
if
(
cursor
->
derived
&&
(
res
=
mysql_derived
(
thd
,
lex
,
(
SELECT_LEX_UNIT
*
)
cursor
->
derived
,
(
SELECT_LEX_UNIT
*
)
cursor
->
derived
,
cursor
,
0
)))
cursor
)))
{
{
if
(
res
<
0
)
if
(
res
<
0
)
send_error
(
thd
,
thd
->
killed
?
ER_SERVER_SHUTDOWN
:
0
);
send_error
(
thd
,
thd
->
killed
?
ER_SERVER_SHUTDOWN
:
0
);
...
@@ -1435,19 +1385,18 @@ mysql_execute_command(THD *thd)
...
@@ -1435,19 +1385,18 @@ mysql_execute_command(THD *thd)
{
{
if
(
lex
->
describe
)
if
(
lex
->
describe
)
{
{
if
(
!
explain_result
)
if
(
!
(
result
=
new
select_send
()))
if
(
!
(
explain_result
=
new
select_send
()))
{
{
send_error
(
thd
,
ER_OUT_OF_RESOURCES
);
send_error
(
thd
,
ER_OUT_OF_RESOURCES
);
DBUG_VOID_RETURN
;
DBUG_VOID_RETURN
;
}
}
else
else
thd
->
send_explain_fields
(
explain_
result
);
thd
->
send_explain_fields
(
result
);
fix_tables_pointers
(
select_lex
);
fix_tables_pointers
(
select_lex
);
res
=
mysql_explain_union
(
thd
,
&
thd
->
lex
.
unit
,
explain_
result
);
res
=
mysql_explain_union
(
thd
,
&
thd
->
lex
.
unit
,
result
);
MYSQL_LOCK
*
save_lock
=
thd
->
lock
;
MYSQL_LOCK
*
save_lock
=
thd
->
lock
;
thd
->
lock
=
(
MYSQL_LOCK
*
)
0
;
thd
->
lock
=
(
MYSQL_LOCK
*
)
0
;
explain_
result
->
send_eof
();
result
->
send_eof
();
thd
->
lock
=
save_lock
;
thd
->
lock
=
save_lock
;
}
}
else
else
...
@@ -2901,26 +2850,24 @@ void
...
@@ -2901,26 +2850,24 @@ void
mysql_init_query
(
THD
*
thd
)
mysql_init_query
(
THD
*
thd
)
{
{
DBUG_ENTER
(
"mysql_init_query"
);
DBUG_ENTER
(
"mysql_init_query"
);
thd
->
lex
.
unit
.
init_query
();
LEX
*
lex
=&
thd
->
lex
;
thd
->
lex
.
unit
.
init_select
();
lex
->
unit
.
init_query
();
thd
->
lex
.
select_lex
.
init_query
();
lex
->
unit
.
init_select
();
thd
->
lex
.
unit
.
slave
=
&
thd
->
lex
.
select_lex
;
lex
->
select_lex
.
init_query
();
thd
->
lex
.
unit
.
global_parameters
=
&
thd
->
lex
.
select_lex
;
//Global limit & order
lex
->
value_list
.
empty
();
thd
->
lex
.
select_lex
.
master
=
&
thd
->
lex
.
unit
;
lex
->
param_list
.
empty
();
thd
->
lex
.
select_lex
.
prev
=
&
thd
->
lex
.
unit
.
slave
;
lex
->
unit
.
global_parameters
=
lex
->
unit
.
slave
=
lex
->
current_select
=
&
lex
->
select_lex
;
thd
->
select_number
=
thd
->
lex
.
select_lex
.
select_number
=
1
;
lex
->
select_lex
.
master
=
&
lex
->
unit
;
thd
->
lex
.
value_list
.
empty
();
lex
->
select_lex
.
prev
=
&
lex
->
unit
.
slave
;
lex
->
olap
=
lex
->
describe
=
0
;
lex
->
derived_tables
=
false
;
thd
->
select_number
=
lex
->
select_lex
.
select_number
=
1
;
thd
->
free_list
=
0
;
thd
->
free_list
=
0
;
thd
->
lex
.
current_select
=
&
thd
->
lex
.
select_lex
;
thd
->
lex
.
olap
=
thd
->
lex
.
describe
=
0
;
thd
->
lex
.
select_lex
.
olap
=
UNSPECIFIED_OLAP_TYPE
;
thd
->
fatal_error
=
0
;
// Safety
thd
->
total_warn_count
=
0
;
// Warnings for this query
thd
->
total_warn_count
=
0
;
// Warnings for this query
thd
->
last_insert_id_used
=
thd
->
query_start_used
=
thd
->
insert_id_used
=
0
;
thd
->
last_insert_id_used
=
thd
->
query_start_used
=
thd
->
insert_id_used
=
0
;
thd
->
sent_row_count
=
thd
->
examined_row_count
=
0
;
thd
->
sent_row_count
=
thd
->
examined_row_count
=
0
;
thd
->
rand_used
=
0
;
thd
->
fatal_error
=
thd
->
rand_used
=
0
;
thd
->
safe_to_cache_query
=
1
;
thd
->
safe_to_cache_query
=
1
;
thd
->
lex
.
param_list
.
empty
();
DBUG_VOID_RETURN
;
DBUG_VOID_RETURN
;
}
}
...
@@ -2932,7 +2879,6 @@ mysql_init_select(LEX *lex)
...
@@ -2932,7 +2879,6 @@ mysql_init_select(LEX *lex)
select_lex
->
init_select
();
select_lex
->
init_select
();
select_lex
->
master_unit
()
->
select_limit
=
select_lex
->
select_limit
=
select_lex
->
master_unit
()
->
select_limit
=
select_lex
->
select_limit
=
lex
->
thd
->
variables
.
select_limit
;
lex
->
thd
->
variables
.
select_limit
;
select_lex
->
olap
=
UNSPECIFIED_OLAP_TYPE
;
lex
->
exchange
=
0
;
lex
->
exchange
=
0
;
lex
->
result
=
0
;
lex
->
result
=
0
;
lex
->
proc_list
.
first
=
0
;
lex
->
proc_list
.
first
=
0
;
...
@@ -3016,14 +2962,13 @@ mysql_parse(THD *thd, char *inBuf, uint length)
...
@@ -3016,14 +2962,13 @@ mysql_parse(THD *thd, char *inBuf, uint length)
mysql_init_query
(
thd
);
mysql_init_query
(
thd
);
thd
->
query_length
=
length
;
thd
->
query_length
=
length
;
thd
->
lex
.
derived_tables
=
false
;
if
(
query_cache_send_result_to_client
(
thd
,
inBuf
,
length
)
<=
0
)
if
(
query_cache_send_result_to_client
(
thd
,
inBuf
,
length
)
<=
0
)
{
{
LEX
*
lex
=
lex_start
(
thd
,
(
uchar
*
)
inBuf
,
length
);
LEX
*
lex
=
lex_start
(
thd
,
(
uchar
*
)
inBuf
,
length
);
if
(
!
yyparse
()
&&
!
thd
->
fatal_error
)
if
(
!
yyparse
()
&&
!
thd
->
fatal_error
)
{
{
if
(
mqh_used
&&
thd
->
user_connect
&&
if
(
mqh_used
&&
thd
->
user_connect
&&
check_mqh
(
thd
,
thd
->
lex
.
sql_command
))
check_mqh
(
thd
,
lex
->
sql_command
))
{
{
thd
->
net
.
error
=
0
;
thd
->
net
.
error
=
0
;
}
}
...
...
sql/sql_select.cc
View file @
d96c670c
...
@@ -7458,8 +7458,10 @@ int mysql_explain_union(THD *thd, SELECT_LEX_UNIT *unit, select_result *result)
...
@@ -7458,8 +7458,10 @@ int mysql_explain_union(THD *thd, SELECT_LEX_UNIT *unit, select_result *result)
((
sl
->
next_select_in_list
())
?
"PRIMARY"
:
((
sl
->
next_select_in_list
())
?
"PRIMARY"
:
"SIMPLE"
)
:
"SIMPLE"
)
:
((
sl
==
first
)
?
((
sl
==
first
)
?
((
sl
->
linkage
==
DERIVED_TABLE_TYPE
)
?
"DERIVED"
:
((
sl
->
dependent
)
?
"DEPENDENT SUBSELECT"
:
((
sl
->
dependent
)
?
"DEPENDENT SUBSELECT"
:
"SUBSELECT"
)
:
"SUBSELECT"
)
)
:
((
sl
->
dependent
)
?
"DEPENDENT UNION"
:
((
sl
->
dependent
)
?
"DEPENDENT UNION"
:
"UNION"
))),
"UNION"
))),
result
);
result
);
...
...
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