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include/mysql_com.h:
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mysql-test/r/create.result:
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mysql-test/r/distinct.result:
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mysql-test/r/group_by.result:
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mysql-test/r/innodb.result:
  Auto merged
mysql-test/r/key_primary.result:
  Auto merged
mysql-test/r/merge.result:
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mysql-test/r/odbc.result:
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mysql-test/r/order_by.result:
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mysql-test/r/union.result:
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mysql-test/r/user_var.result:
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mysql-test/r/varbinary.result:
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mysql-test/t/union.test:
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sql/item_cmpfunc.cc:
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sql/mysql_priv.h:
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sql/sql_derived.cc:
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sql/table.h:
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This commit is contained in:
unknown 2002-10-04 14:15:59 +03:00
commit 05c5908a9e
49 changed files with 1329 additions and 834 deletions
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7
include/mysql_com.h
View file

@ -133,8 +133,13 @@ typedef struct st_net {
unsigned int *return_status;
unsigned char reading_or_writing;
char save_char;
my_bool report_error; /* We should report error (we have unreported error) */
my_bool no_send_ok;
gptr query_cache_query;
/*
Pointer to query object in query cache, do not equal NULL (0) for
queries in cache that have not stored its results yet
*/
gptr query_cache_query;
} NET;
#define packet_error (~(unsigned long) 0)

3
mysql-test/create-test-result
View file

@ -27,6 +27,7 @@ test_name=$1
[ -z $test_name ] && usage
result_file=$RESULT_DIR/$test_name.result
reject_file=$RESULT_DIR/$test_name.reject
[ -f $result_file ] && die "result file $result_file has already been created"
@ -34,8 +35,6 @@ touch $result_file
echo "Running the test case against empty file, will fail, but don't worry"
./mysql-test-run --local $test_name
reject_file=$result_file.reject
if [ -f $reject_file ] ; then
echo "Below are the contents of the reject file:"
echo "-----start---------------------"

4
mysql-test/r/compare.result
View file

@ -2,8 +2,8 @@ drop table if exists t1;
CREATE TABLE t1 (id CHAR(12) not null, PRIMARY KEY (id));
insert into t1 values ('000000000001'),('000000000002');
explain select * from t1 where id=000000000001;
table type possible_keys key key_len ref rows Extra
t1 index PRIMARY PRIMARY 12 NULL 2 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 12 NULL 2 where used; Using index
select * from t1 where id=000000000001;
id
000000000001

4
mysql-test/r/create.result
View file

@ -62,8 +62,8 @@ create table t1 (a int auto_increment not null primary key, B CHAR(20));
insert into t1 (b) values ("hello"),("my"),("world");
create table t2 (key (b)) select * from t1;
explain select * from t2 where b="world";
table type possible_keys key key_len ref rows Extra
t2 ref B B 21 const 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref B B 21 const 1 where used
select * from t2 where b="world";
a B
3 world

30
mysql-test/r/distinct.result
View file

@ -172,10 +172,10 @@ b
INSERT INTO t2 values (1),(2),(3);
INSERT INTO t3 VALUES (1,'1'),(2,'2'),(1,'1'),(2,'2');
explain SELECT distinct t3.a FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a;
table type possible_keys key key_len ref rows Extra
t3 index a a 5 NULL 6 Using index; Using temporary
t2 index a a 4 NULL 5 Using index; Distinct
t1 eq_ref PRIMARY PRIMARY 4 t2.a 1 where used; Distinct
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 index a a 5 NULL 6 Using index; Using temporary
1 SIMPLE t2 index a a 4 NULL 5 Using index; Distinct
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 t2.a 1 where used; Distinct
SELECT distinct t3.a FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a;
a
1
@ -188,9 +188,9 @@ insert into t3 select * from t4;
insert into t4 select * from t3;
insert into t3 select * from t4;
explain select distinct t1.a from t1,t3 where t1.a=t3.a;
table type possible_keys key key_len ref rows Extra
t1 index PRIMARY PRIMARY 4 NULL 2 Using index; Using temporary
t3 ref a a 5 t1.a 10 Using index; Distinct
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 2 Using index; Using temporary
1 SIMPLE t3 ref a a 5 t1.a 10 Using index; Distinct
select distinct t1.a from t1,t3 where t1.a=t3.a;
a
1
@ -274,14 +274,14 @@ on j_lj_t3.id=t3_lj.id
WHERE
((t1.id=j_lj_t2.id AND t2_lj.id IS NULL) OR (t1.id=t2.id AND t2.idx=2))
AND ((t1.id=j_lj_t3.id AND t3_lj.id IS NULL) OR (t1.id=t3.id AND t3.idx=2));
table type possible_keys key key_len ref rows Extra
t1 index id id 4 NULL 2 Using index; Using temporary
t2 index id id 8 NULL 1 Using index; Distinct
t3 index id id 8 NULL 1 Using index; Distinct
j_lj_t2 index id id 4 NULL 2 where used; Using index; Distinct
t2_lj index id id 8 NULL 1 where used; Using index; Distinct
j_lj_t3 index id id 4 NULL 2 where used; Using index; Distinct
t3_lj index id id 8 NULL 1 where used; Using index; Distinct
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index id id 4 NULL 2 Using index; Using temporary
1 SIMPLE t2 index id id 8 NULL 1 Using index; Distinct
1 SIMPLE t3 index id id 8 NULL 1 Using index; Distinct
1 SIMPLE j_lj_t2 index id id 4 NULL 2 where used; Using index; Distinct
1 SIMPLE t2_lj index id id 8 NULL 1 where used; Using index; Distinct
1 SIMPLE j_lj_t3 index id id 4 NULL 2 where used; Using index; Distinct
1 SIMPLE t3_lj index id id 8 NULL 1 where used; Using index; Distinct
SELECT DISTINCT
t1.id
from

20
mysql-test/r/explain.result
View file

@ -9,22 +9,22 @@ select * from t1 where str="foo";
id str
3 foo
explain select * from t1 where str is null;
table type possible_keys key key_len ref rows Extra
t1 ref str str 11 const 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref str str 11 const 1 where used
explain select * from t1 where str="foo";
table type possible_keys key key_len ref rows Extra
t1 const str str 11 const 1
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 const str str 11 const 1
explain select * from t1 ignore key (str) where str="foo";
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 where used
explain select * from t1 use key (str,str) where str="foo";
table type possible_keys key key_len ref rows Extra
t1 const str str 11 const 1
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 const str str 11 const 1
explain select * from t1 use key (str,str,foo) where str="foo";
Key column 'foo' doesn't exist in table
explain select * from t1 ignore key (str,str,foo) where str="foo";
Key column 'foo' doesn't exist in table
drop table t1;
explain select 1;
Comment
No tables used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE No tables used

20
mysql-test/r/group_by.result
View file

@ -225,19 +225,19 @@ key (score)
);
INSERT INTO t1 VALUES (1,1,1),(2,2,2),(2,1,1),(3,3,3),(4,3,3),(5,3,3);
explain select userid,count(*) from t1 group by userid desc;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort
select userid,count(*) from t1 group by userid desc;
userid count(*)
3 3
2 1
1 2
explain select spid,count(*) from t1 where spid between 1 and 2 group by spid desc;
table type possible_keys key key_len ref rows Extra
t1 range spID spID 5 NULL 2 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range spID spID 5 NULL 2 where used; Using index
explain select spid,count(*) from t1 where spid between 1 and 2 group by spid;
table type possible_keys key key_len ref rows Extra
t1 range spID spID 5 NULL 2 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range spID spID 5 NULL 2 where used; Using index
select spid,count(*) from t1 where spid between 1 and 2 group by spid;
spid count(*)
1 1
@ -247,8 +247,8 @@ spid count(*)
2 2
1 1
explain select sql_big_result spid,sum(userid) from t1 group by spid desc;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 6 Using filesort
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 6 Using filesort
select sql_big_result spid,sum(userid) from t1 group by spid desc;
spid sum(userid)
5 3
@ -257,8 +257,8 @@ spid sum(userid)
2 3
1 1
explain select sql_big_result score,count(*) from t1 group by score desc;
table type possible_keys key key_len ref rows Extra
t1 index NULL score 3 NULL 6 Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL score 3 NULL 6 Using index
select sql_big_result score,count(*) from t1 group by score desc;
score count(*)
3 3

30
mysql-test/r/heap.result
View file

@ -65,8 +65,8 @@ a
869751
alter table t1 type=myisam;
explain select * from t1 where a in (869751,736494,226312,802616);
table type possible_keys key key_len ref rows Extra
t1 range uniq_id uniq_id 4 NULL 4 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range uniq_id uniq_id 4 NULL 4 where used; Using index
drop table t1;
create table t1 (x int not null, y int not null, key x (x), unique y (y))
type=heap;
@ -84,9 +84,9 @@ x y x y
2 5 2 2
2 6 2 2
explain select * from t1,t1 as t2 where t1.x=t2.y;
table type possible_keys key key_len ref rows Extra
t1 ALL x NULL NULL NULL 6
t2 eq_ref y y 4 t1.x 1
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL x NULL NULL NULL 6
1 SIMPLE t2 eq_ref y y 4 t1.x 1
drop table t1;
create table t1 (a int) type=heap;
insert into t1 values(1);
@ -158,18 +158,18 @@ drop table t1;
create table t1 (btn char(10) not null, key(btn)) type=heap;
insert into t1 values ("hello"),("hello"),("hello"),("hello"),("hello"),("a"),("b"),("c"),("d"),("e"),("f"),("g"),("h"),("i");
explain select * from t1 where btn like "q%";
table type possible_keys key key_len ref rows Extra
t1 ALL btn NULL NULL NULL 14 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL btn NULL NULL NULL 14 where used
select * from t1 where btn like "q%";
btn
alter table t1 add column new_col char(1) not null, add key (btn,new_col), drop key btn;
update t1 set new_col=btn;
explain select * from t1 where btn="a";
table type possible_keys key key_len ref rows Extra
t1 ALL btn NULL NULL NULL 14 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL btn NULL NULL NULL 14 where used
explain select * from t1 where btn="a" and new_col="a";
table type possible_keys key key_len ref rows Extra
t1 ref btn btn 11 const,const 10 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref btn btn 11 const,const 10 where used
drop table t1;
CREATE TABLE t1 (
a int default NULL,
@ -181,16 +181,16 @@ INSERT INTO t1 VALUES (NULL,99),(99,NULL),(1,1),(2,2),(1,3);
SELECT * FROM t1 WHERE a=NULL;
a b
explain SELECT * FROM t1 WHERE a IS NULL;
table type possible_keys key key_len ref rows Extra
t1 ref a a 5 const 10 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 5 const 10 where used
SELECT * FROM t1 WHERE a<=>NULL;
a b
NULL 99
SELECT * FROM t1 WHERE b=NULL;
a b
explain SELECT * FROM t1 WHERE b IS NULL;
table type possible_keys key key_len ref rows Extra
t1 ref b b 5 const 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref b b 5 const 1 where used
SELECT * FROM t1 WHERE b<=>NULL;
a b
99 NULL

42
mysql-test/r/heap_btree.result
View file

@ -65,8 +65,8 @@ a
869751
alter table t1 type=myisam;
explain select * from t1 where a in (869751,736494,226312,802616);
table type possible_keys key key_len ref rows Extra
t1 range uniq_id uniq_id 4 NULL 4 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range uniq_id uniq_id 4 NULL 4 where used; Using index
drop table t1;
create table t1 (x int not null, y int not null, key x using BTREE (x), unique y using BTREE (y))
type=heap;
@ -84,9 +84,9 @@ x y x y
2 5 2 2
2 6 2 2
explain select * from t1,t1 as t2 where t1.x=t2.y;
table type possible_keys key key_len ref rows Extra
t1 ALL x NULL NULL NULL 6
t2 eq_ref y y 4 t1.x 1
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL x NULL NULL NULL 6
1 SIMPLE t2 eq_ref y y 4 t1.x 1
drop table t1;
create table t1 (a int) type=heap;
insert into t1 values(1);
@ -120,18 +120,18 @@ a b
1 6
1 6
explain select * from tx where a=x order by a,b;
table type possible_keys key key_len ref rows Extra
tx ref a a x const x where used
id select_type table type possible_keys key key_len ref rows Extra
x SIMPLE tx ref a a x const x where used
explain select * from tx where a=x order by b;
table type possible_keys key key_len ref rows Extra
tx ref a a x const x where used
id select_type table type possible_keys key key_len ref rows Extra
x SIMPLE tx ref a a x const x where used
select * from t1 where b=1;
a b
1 1
1 1
explain select * from tx where b=x;
table type possible_keys key key_len ref rows Extra
tx ref b b x const x where used
id select_type table type possible_keys key key_len ref rows Extra
x SIMPLE tx ref b b x const x where used
drop table t1;
create table t1 (id int unsigned not null, primary key using BTREE (id)) type=HEAP;
insert into t1 values(1);
@ -171,18 +171,18 @@ drop table t1;
create table t1 (btn char(10) not null, key using BTREE (btn)) type=heap;
insert into t1 values ("hello"),("hello"),("hello"),("hello"),("hello"),("a"),("b"),("c"),("d"),("e"),("f"),("g"),("h"),("i");
explain select * from t1 where btn like "q%";
table type possible_keys key key_len ref rows Extra
t1 ALL btn NULL NULL NULL 14 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL btn NULL NULL NULL 14 where used
select * from t1 where btn like "q%";
btn
alter table t1 add column new_col char(1) not null, add key using BTREE (btn,new_col), drop key btn;
update t1 set new_col=btn;
explain select * from t1 where btn="a";
table type possible_keys key key_len ref rows Extra
t1 ref btn btn 10 const 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref btn btn 10 const 1 where used
explain select * from t1 where btn="a" and new_col="a";
table type possible_keys key key_len ref rows Extra
t1 ref btn btn 11 const,const 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref btn btn 11 const,const 1 where used
drop table t1;
CREATE TABLE t1 (
a int default NULL,
@ -194,16 +194,16 @@ INSERT INTO t1 VALUES (NULL,99),(99,NULL),(1,1),(2,2),(1,3);
SELECT * FROM t1 WHERE a=NULL;
a b
explain SELECT * FROM t1 WHERE a IS NULL;
table type possible_keys key key_len ref rows Extra
t1 ref a a 5 const 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 5 const 1 where used
SELECT * FROM t1 WHERE a<=>NULL;
a b
NULL 99
SELECT * FROM t1 WHERE b=NULL;
a b
explain SELECT * FROM t1 WHERE b IS NULL;
table type possible_keys key key_len ref rows Extra
t1 ref b b 5 const 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref b b 5 const 1 where used
SELECT * FROM t1 WHERE b<=>NULL;
a b
99 NULL

30
mysql-test/r/heap_hash.result
View file

@ -65,8 +65,8 @@ a
869751
alter table t1 type=myisam;
explain select * from t1 where a in (869751,736494,226312,802616);
table type possible_keys key key_len ref rows Extra
t1 range uniq_id uniq_id 4 NULL 4 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range uniq_id uniq_id 4 NULL 4 where used; Using index
drop table t1;
create table t1 (x int not null, y int not null, key x using HASH (x), unique y using HASH (y))
type=heap;
@ -84,9 +84,9 @@ x y x y
2 5 2 2
2 6 2 2
explain select * from t1,t1 as t2 where t1.x=t2.y;
table type possible_keys key key_len ref rows Extra
t1 ALL x NULL NULL NULL 6
t2 eq_ref y y 4 t1.x 1
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL x NULL NULL NULL 6
1 SIMPLE t2 eq_ref y y 4 t1.x 1
drop table t1;
create table t1 (a int) type=heap;
insert into t1 values(1);
@ -158,18 +158,18 @@ drop table t1;
create table t1 (btn char(10) not null, key using HASH (btn)) type=heap;
insert into t1 values ("hello"),("hello"),("hello"),("hello"),("hello"),("a"),("b"),("c"),("d"),("e"),("f"),("g"),("h"),("i");
explain select * from t1 where btn like "q%";
table type possible_keys key key_len ref rows Extra
t1 ALL btn NULL NULL NULL 14 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL btn NULL NULL NULL 14 where used
select * from t1 where btn like "q%";
btn
alter table t1 add column new_col char(1) not null, add key using HASH (btn,new_col), drop key btn;
update t1 set new_col=btn;
explain select * from t1 where btn="a";
table type possible_keys key key_len ref rows Extra
t1 ALL btn NULL NULL NULL 14 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL btn NULL NULL NULL 14 where used
explain select * from t1 where btn="a" and new_col="a";
table type possible_keys key key_len ref rows Extra
t1 ref btn btn 11 const,const 10 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref btn btn 11 const,const 10 where used
drop table t1;
CREATE TABLE t1 (
a int default NULL,
@ -181,16 +181,16 @@ INSERT INTO t1 VALUES (NULL,99),(99,NULL),(1,1),(2,2),(1,3);
SELECT * FROM t1 WHERE a=NULL;
a b
explain SELECT * FROM t1 WHERE a IS NULL;
table type possible_keys key key_len ref rows Extra
t1 ref a a 5 const 10 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 5 const 10 where used
SELECT * FROM t1 WHERE a<=>NULL;
a b
NULL 99
SELECT * FROM t1 WHERE b=NULL;
a b
explain SELECT * FROM t1 WHERE b IS NULL;
table type possible_keys key key_len ref rows Extra
t1 ref b b 5 const 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref b b 5 const 1 where used
SELECT * FROM t1 WHERE b<=>NULL;
a b
99 NULL

52
mysql-test/r/innodb.result
View file

@ -139,14 +139,14 @@ id parent_id level
1010 102 2
1015 102 2
explain select level from t1 where level=1;
table type possible_keys key key_len ref rows Extra
t1 ref level level 1 const 12 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref level level 1 const 12 where used; Using index
explain select level,id from t1 where level=1;
table type possible_keys key key_len ref rows Extra
t1 ref level level 1 const 12 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref level level 1 const 12 where used; Using index
explain select level,id,parent_id from t1 where level=1;
table type possible_keys key key_len ref rows Extra
t1 ref level level 1 const 12 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref level level 1 const 12 where used
select level,id from t1 where level=1;
level id
1 1002
@ -596,8 +596,8 @@ id parent_id level
1025 102 2
1016 102 2
explain select level from t1 where level=1;
table type possible_keys key key_len ref rows Extra
t1 ref level level 1 const 6 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref level level 1 const 6 where used; Using index
select level,id from t1 where level=1;
level id
1 1004
@ -758,8 +758,8 @@ DROP TABLE t1;
create table t1 (a int primary key,b int, c int, d int, e int, f int, g int, h int, i int, j int, k int, l int, m int, n int, o int, p int, q int, r int, s int, t int, u int, v int, w int, x int, y int, z int, a1 int, a2 int, a3 int, a4 int, a5 int, a6 int, a7 int, a8 int, a9 int, b1 int, b2 int, b3 int, b4 int, b5 int, b6 int) type = innodb;
insert into t1 values (1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1);
explain select * from t1 where a > 0 and a < 50;
table type possible_keys key key_len ref rows Extra
t1 range PRIMARY PRIMARY 4 NULL 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 1 where used
drop table t1;
create table t1 (id int NOT NULL,id2 int NOT NULL,id3 int NOT NULL,dummy1 char(30),primary key (id,id2),index index_id3 (id3)) type=innodb;
insert into t1 values (0,0,0,'ABCDEFGHIJ'),(2,2,2,'BCDEFGHIJK'),(1,1,1,'CDEFGHIJKL');
@ -892,29 +892,29 @@ drop table t1;
create table t1 (a int not null, b int not null, c int not null, primary key (a),key(b)) type=innodb;
insert into t1 values (3,3,3),(1,1,1),(2,2,2),(4,4,4);
explain select * from t1 order by a;
table type possible_keys key key_len ref rows Extra
t1 index NULL PRIMARY 4 NULL 4
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 4 NULL 4
explain select * from t1 order by b;
table type possible_keys key key_len ref rows Extra
t1 index NULL b 4 NULL 4
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL b 4 NULL 4
explain select * from t1 order by c;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4 Using filesort
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using filesort
explain select a from t1 order by a;
table type possible_keys key key_len ref rows Extra
t1 index NULL PRIMARY 4 NULL 4 Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 4 NULL 4 Using index
explain select b from t1 order by b;
table type possible_keys key key_len ref rows Extra
t1 index NULL b 4 NULL 4 Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL b 4 NULL 4 Using index
explain select a,b from t1 order by b;
table type possible_keys key key_len ref rows Extra
t1 index NULL b 4 NULL 4 Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL b 4 NULL 4 Using index
explain select a,b from t1;
table type possible_keys key key_len ref rows Extra
t1 index NULL b 4 NULL 4 Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL b 4 NULL 4 Using index
explain select a,b,c from t1;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
drop table t1;
create table t1 (t int not null default 1, key (t)) type=innodb;
desc t1;

46
mysql-test/r/join_outer.result
View file

@ -90,12 +90,12 @@ grp a c id a c d
2 3 c NULL NULL NULL NULL
NULL NULL NULL NULL NULL NULL
explain select t1.*,t2.* from t1,t2 where t1.a=t2.a and isnull(t2.a)=1;
Comment
Impossible WHERE noticed after reading const tables
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables
explain select t1.*,t2.* from t1 left join t2 on t1.a=t2.a where isnull(t2.a)=1;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 7
t2 eq_ref PRIMARY PRIMARY 8 t1.a 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 7
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 8 t1.a 1 where used
select t1.*,t2.*,t3.a from t1 left join t2 on (t1.a=t2.a) left join t1 as t3 on (t2.a=t3.a);
grp a c id a c d a
1 1 a 1 1 a 1 1
@ -311,13 +311,13 @@ select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where
name name id
Lilliana Angelovska NULL NULL
explain select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.id is null;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 3
t2 ALL NULL NULL NULL NULL 3 where used; Not exists
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 where used; Not exists
explain select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.name is null;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 3
t2 ALL NULL NULL NULL NULL 3 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 where used
select count(*) from t1 left join t2 on (t1.id = t2.owner);
count(*)
4
@ -331,13 +331,13 @@ select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where
name name id
Lilliana Angelovska NULL NULL
explain select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.id is null;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 3
t2 ALL NULL NULL NULL NULL 3 where used; Not exists
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 where used; Not exists
explain select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.name is null;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 3
t2 ALL NULL NULL NULL NULL 3 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 where used
select count(*) from t2 right join t1 on (t1.id = t2.owner);
count(*)
4
@ -618,9 +618,9 @@ UNIQUE id (id,idx)
);
INSERT INTO t2 VALUES (1,1);
explain SELECT * from t1 left join t2 on t1.id=t2.id where t2.id IS NULL;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 2
t2 index id id 8 NULL 1 where used; Using index; Not exists
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
1 SIMPLE t2 index id id 8 NULL 1 where used; Using index; Not exists
SELECT * from t1 left join t2 on t1.id=t2.id where t2.id IS NULL;
id name id idx
2 no NULL NULL
@ -638,9 +638,9 @@ create table t2 (fooID smallint unsigned not null, barID smallint unsigned not n
insert into t1 (fooID) values (10),(20),(30);
insert into t2 values (10,1),(20,2),(30,3);
explain select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
table type possible_keys key key_len ref rows Extra
t2 index NULL PRIMARY 4 NULL 3 Using index
t1 eq_ref PRIMARY PRIMARY 2 const 1 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL PRIMARY 4 NULL 3 Using index
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 2 const 1 where used; Using index
select * from t2 left join t1 on t1.fooID = t2.fooID and t1.fooID = 30;
fooID barID fooID
10 1 NULL

6
mysql-test/r/key_diff.result
View file

@ -34,9 +34,9 @@ C c a a
D E a a
a a a a
explain select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B;
table type possible_keys key key_len ref rows Extra
t1 ALL a NULL NULL NULL 5
t2 ALL b NULL NULL NULL 5 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL a NULL NULL NULL 5
1 SIMPLE t2 ALL b NULL NULL NULL 5 where used
select t1.*,t2.* from t1,t1 as t2 where t1.A=t2.B order by binary t1.a,t2.a;
a b a b
A B a a

8
mysql-test/r/key_primary.result
View file

@ -12,9 +12,9 @@ select * from t1 where t1 like "a_\%";
t1
AB%
describe select * from t1 where t1="ABC";
table type possible_keys key key_len ref rows Extra
t1 const PRIMARY PRIMARY 3 const 1
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 const PRIMARY PRIMARY 3 const 1
describe select * from t1 where t1="ABCD";
Comment
Impossible WHERE noticed after reading const tables
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables
drop table t1;

12
mysql-test/r/merge.result
View file

@ -34,11 +34,11 @@ insert into t2 select NULL,message from t1;
insert into t1 select NULL,message from t2;
create table t3 (a int not null, b char(20), key(a)) type=MERGE UNION=(test.t1,test.t2);
explain select * from t3 where a < 10;
table type possible_keys key key_len ref rows Extra
t3 range a a 4 NULL 10 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range a a 4 NULL 10 where used
explain select * from t3 where a > 10 and a < 20;
table type possible_keys key key_len ref rows Extra
t3 range a a 4 NULL 10 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range a a 4 NULL 10 where used
select * from t3 where a = 10;
a b
10 Testing
@ -84,8 +84,8 @@ a b
19 Testing
19 Testing
explain select a from t3 order by a desc limit 10;
table type possible_keys key key_len ref rows Extra
t3 index NULL a 4 NULL 1131 Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 index NULL a 4 NULL 1131 Using index
select a from t3 order by a desc limit 10;
a
699

32
mysql-test/r/myisam.result
View file

@ -51,29 +51,29 @@ drop table t1;
create table t1 (a int not null, b int not null, c int not null, primary key (a),key(b)) type=myisam;
insert into t1 values (3,3,3),(1,1,1),(2,2,2),(4,4,4);
explain select * from t1 order by a;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4 Using filesort
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using filesort
explain select * from t1 order by b;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4 Using filesort
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using filesort
explain select * from t1 order by c;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4 Using filesort
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using filesort
explain select a from t1 order by a;
table type possible_keys key key_len ref rows Extra
t1 index NULL PRIMARY 4 NULL 4 Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 4 NULL 4 Using index
explain select b from t1 order by b;
table type possible_keys key key_len ref rows Extra
t1 index NULL b 4 NULL 4 Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL b 4 NULL 4 Using index
explain select a,b from t1 order by b;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4 Using filesort
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using filesort
explain select a,b from t1;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
explain select a,b,c from t1;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
drop table t1;
CREATE TABLE `t1` (
`post_id` mediumint(8) unsigned NOT NULL auto_increment,

104
mysql-test/r/null_key.result
View file

@ -2,38 +2,38 @@ drop table if exists t1;
create table t1 (a int, b int not null,unique key (a,b),index(b)) type=myisam;
insert ignore into t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(null,7),(9,9),(8,8),(7,7),(null,9),(null,9),(6,6);
explain select * from t1 where a is null;
table type possible_keys key key_len ref rows Extra
t1 ref a a 5 const 3 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 5 const 3 where used; Using index
explain select * from t1 where a is null and b = 2;
table type possible_keys key key_len ref rows Extra
t1 ref a,b a 9 const,const 1 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 9 const,const 1 where used; Using index
explain select * from t1 where a is null and b = 7;
table type possible_keys key key_len ref rows Extra
t1 ref a,b a 9 const,const 1 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 9 const,const 1 where used; Using index
explain select * from t1 where a=2 and b = 2;
table type possible_keys key key_len ref rows Extra
t1 const a,b a 9 const,const 1
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 const a,b a 9 const,const 1
explain select * from t1 where a<=>b limit 2;
table type possible_keys key key_len ref rows Extra
t1 index NULL a 9 NULL 12 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 9 NULL 12 where used; Using index
explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
table type possible_keys key key_len ref rows Extra
t1 range a,b a 9 NULL 3 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,b a 9 NULL 3 where used; Using index
explain select * from t1 where (a is null or a = 7) and b=7;
table type possible_keys key key_len ref rows Extra
t1 ref a,b b 4 const 2 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b b 4 const 2 where used
explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
table type possible_keys key key_len ref rows Extra
t1 ref a,b a 5 const 3 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 where used; Using index
explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
table type possible_keys key key_len ref rows Extra
t1 range a,b a 9 NULL 2 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,b a 9 NULL 2 where used; Using index
explain select * from t1 where a > 1 and a < 3 limit 1;
table type possible_keys key key_len ref rows Extra
t1 range a a 5 NULL 1 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 1 where used; Using index
explain select * from t1 where a > 8 and a < 9;
table type possible_keys key key_len ref rows Extra
t1 range a a 5 NULL 1 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 1 where used; Using index
select * from t1 where a is null;
a b
NULL 7
@ -65,44 +65,44 @@ NULL 9
NULL 9
alter table t1 modify b blob not null, add c int not null, drop key a, add unique key (a,b(20),c), drop key b, add key (b(10));
explain select * from t1 where a is null and b = 2;
table type possible_keys key key_len ref rows Extra
t1 ref a,b a 5 const 3 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 where used
explain select * from t1 where a is null and b = 2 and c=0;
table type possible_keys key key_len ref rows Extra
t1 ref a,b a 5 const 3 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 where used
explain select * from t1 where a is null and b = 7 and c=0;
table type possible_keys key key_len ref rows Extra
t1 ref a,b a 5 const 3 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 where used
explain select * from t1 where a=2 and b = 2;
table type possible_keys key key_len ref rows Extra
t1 ref a,b a 5 const 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 1 where used
explain select * from t1 where a<=>b limit 2;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 12 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 12 where used
explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 and c=0 limit 3;
table type possible_keys key key_len ref rows Extra
t1 range a,b a 5 NULL 5 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,b a 5 NULL 5 where used
explain select * from t1 where (a is null or a = 7) and b=7 and c=0;
table type possible_keys key key_len ref rows Extra
t1 range a,b a 5 NULL 4 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,b a 5 NULL 4 where used
explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
table type possible_keys key key_len ref rows Extra
t1 ref a,b a 5 const 3 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 where used
explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
table type possible_keys key key_len ref rows Extra
t1 ref a,b a 5 const 3 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 where used
explain select * from t1 where a > 1 and a < 3 limit 1;
table type possible_keys key key_len ref rows Extra
t1 range a a 5 NULL 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 1 where used
explain select * from t1 where a is null and b=7 or a > 1 and a < 3 limit 1;
table type possible_keys key key_len ref rows Extra
t1 range a,b a 5 NULL 4 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,b a 5 NULL 4 where used
explain select * from t1 where a > 8 and a < 9;
table type possible_keys key key_len ref rows Extra
t1 range a a 5 NULL 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 1 where used
explain select * from t1 where b like "6%";
table type possible_keys key key_len ref rows Extra
t1 range b b 12 NULL 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range b b 12 NULL 1 where used
select * from t1 where a is null;
a b c
NULL 7 0
@ -151,11 +151,11 @@ PRIMARY KEY (id)
INSERT INTO t1 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
INSERT INTO t2 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
explain select id from t1 where uniq_id is null;
table type possible_keys key key_len ref rows Extra
t1 ref idx1 idx1 5 const 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref idx1 idx1 5 const 1 where used
explain select id from t1 where uniq_id =1;
table type possible_keys key key_len ref rows Extra
t1 const idx1 idx1 5 const 1
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 const idx1 idx1 5 const 1
UPDATE t1 SET id=id+100 where uniq_id is null;
UPDATE t2 SET id=id+100 where uniq_id is null;
select id from t1 where uniq_id is null;

4
mysql-test/r/odbc.result
View file

@ -11,6 +11,6 @@ a b
select * from t1 where a is null;
a b
explain select * from t1 where b is null;
Comment
Impossible WHERE noticed after reading const tables
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables
drop table t1;

98
mysql-test/r/order_by.result
View file

@ -263,14 +263,14 @@ drop table t1;
create table t1 (a int not null, b int, c varchar(10), key (a, b, c));
insert into t1 values (1, NULL, NULL), (1, NULL, 'b'), (1, 1, NULL), (1, 1, 'b'), (1, 1, 'b'), (2, 1, 'a'), (2, 1, 'b'), (2, 2, 'a'), (2, 2, 'b'), (2, 3, 'c'),(1,3,'b');
explain select * from t1 where (a = 1 and b is null and c = 'b') or (a > 2) order by a desc;
table type possible_keys key key_len ref rows Extra
t1 range a a 20 NULL 2 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 20 NULL 2 where used; Using index
select * from t1 where (a = 1 and b is null and c = 'b') or (a > 2) order by a desc;
a b c
1 NULL b
explain select * from t1 where a >= 1 and a < 3 order by a desc;
table type possible_keys key key_len ref rows Extra
t1 range a a 4 NULL 10 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 4 NULL 10 where used; Using index
select * from t1 where a >= 1 and a < 3 order by a desc;
a b c
2 3 c
@ -285,8 +285,8 @@ a b c
1 NULL b
1 NULL NULL
explain select * from t1 where a = 1 order by a desc, b desc;
table type possible_keys key key_len ref rows Extra
t1 ref a a 4 const 5 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 4 const 5 where used; Using index
select * from t1 where a = 1 order by a desc, b desc;
a b c
1 3 b
@ -296,35 +296,35 @@ a b c
1 NULL b
1 NULL NULL
explain select * from t1 where a = 1 and b is null order by a desc, b desc;
table type possible_keys key key_len ref rows Extra
t1 ref a a 9 const,const 2 where used; Using index; Using filesort
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 9 const,const 2 where used; Using index; Using filesort
select * from t1 where a = 1 and b is null order by a desc, b desc;
a b c
1 NULL NULL
1 NULL b
explain select * from t1 where a >= 1 and a < 3 and b >0 order by a desc,b desc;
table type possible_keys key key_len ref rows Extra
t1 range a a 9 NULL 8 where used; Using index; Using filesort
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 9 NULL 8 where used; Using index; Using filesort
explain select * from t1 where a = 2 and b >0 order by a desc,b desc;
table type possible_keys key key_len ref rows Extra
t1 range a a 9 NULL 5 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 9 NULL 5 where used; Using index
explain select * from t1 where a = 2 and b is null order by a desc,b desc;
table type possible_keys key key_len ref rows Extra
t1 ref a a 9 const,const 1 where used; Using index; Using filesort
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 9 const,const 1 where used; Using index; Using filesort
explain select * from t1 where a = 2 and (b is null or b > 0) order by a
desc,b desc;
table type possible_keys key key_len ref rows Extra
t1 range a a 9 NULL 6 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 9 NULL 6 where used; Using index
explain select * from t1 where a = 2 and b > 0 order by a desc,b desc;
table type possible_keys key key_len ref rows Extra
t1 range a a 9 NULL 5 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 9 NULL 5 where used; Using index
explain select * from t1 where a = 2 and b < 2 order by a desc,b desc;
table type possible_keys key key_len ref rows Extra
t1 range a a 9 NULL 2 where used; Using index; Using filesort
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 9 NULL 2 where used; Using index; Using filesort
alter table t1 modify b int not null, modify c varchar(10) not null;
explain select * from t1 order by a, b, c;
table type possible_keys key key_len ref rows Extra
t1 index NULL a 18 NULL 11 Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 18 NULL 11 Using index
select * from t1 order by a, b, c;
a b c
1 0
@ -339,8 +339,8 @@ a b c
2 2 b
2 3 c
explain select * from t1 order by a desc, b desc, c desc;
table type possible_keys key key_len ref rows Extra
t1 index NULL a 18 NULL 11 Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 18 NULL 11 Using index
select * from t1 order by a desc, b desc, c desc;
a b c
2 3 c
@ -355,15 +355,15 @@ a b c
1 0 b
1 0
explain select * from t1 where (a = 1 and b = 1 and c = 'b') or (a > 2) order by a desc;
table type possible_keys key key_len ref rows Extra
t1 range a a 18 NULL 3 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 18 NULL 3 where used; Using index
select * from t1 where (a = 1 and b = 1 and c = 'b') or (a > 2) order by a desc;
a b c
1 1 b
1 1 b
explain select * from t1 where a < 2 and b <= 1 order by a desc, b desc;
table type possible_keys key key_len ref rows Extra
t1 range a a 4 NULL 6 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 4 NULL 6 where used; Using index
select * from t1 where a < 2 and b <= 1 order by a desc, b desc;
a b c
1 1 b
@ -386,8 +386,8 @@ a b c
1 1 b
1 1
explain select * from t1 where a between 1 and 3 and b <= 1 order by a desc, b desc;
table type possible_keys key key_len ref rows Extra
t1 range a a 8 NULL 10 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 8 NULL 10 where used; Using index
select * from t1 where a between 1 and 3 and b <= 1 order by a desc, b desc;
a b c
2 1 b
@ -398,8 +398,8 @@ a b c
1 0 b
1 0
explain select * from t1 where a between 0 and 1 order by a desc, b desc;
table type possible_keys key key_len ref rows Extra
t1 range a a 4 NULL 5 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 4 NULL 5 where used; Using index
select * from t1 where a between 0 and 1 order by a desc, b desc;
a b c
1 3 b
@ -449,27 +449,27 @@ gid sid uid
104505 5 117
103853 5 250
EXPLAIN select t1.gid, t2.sid, t3.uid from t3, t2, t1 where t2.gid = t1.gid and t2.uid = t3.uid order by t1.gid, t3.uid;
table type possible_keys key key_len ref rows Extra
t1 index PRIMARY PRIMARY 4 NULL 6 Using index
t2 eq_ref PRIMARY,uid PRIMARY 4 t1.gid 1
t3 eq_ref PRIMARY PRIMARY 2 t2.uid 1 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 6 Using index
1 SIMPLE t2 eq_ref PRIMARY,uid PRIMARY 4 t1.gid 1
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 2 t2.uid 1 where used; Using index
EXPLAIN SELECT t1.gid, t3.uid from t1, t3 where t1.gid = t3.uid order by t1.gid,t3.skr;
table type possible_keys key key_len ref rows Extra
t1 index PRIMARY PRIMARY 4 NULL 6 Using index
t3 eq_ref PRIMARY PRIMARY 2 t1.gid 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 6 Using index
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 2 t1.gid 1 where used
EXPLAIN SELECT t1.gid, t2.sid, t3.uid from t2, t1, t3 where t2.gid = t1.gid and t2.uid = t3.uid order by t3.uid, t1.gid;
table type possible_keys key key_len ref rows Extra
t1 index PRIMARY PRIMARY 4 NULL 6 Using index; Using temporary; Using filesort
t2 eq_ref PRIMARY,uid PRIMARY 4 t1.gid 1
t3 eq_ref PRIMARY PRIMARY 2 t2.uid 1 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 6 Using index; Using temporary; Using filesort
1 SIMPLE t2 eq_ref PRIMARY,uid PRIMARY 4 t1.gid 1
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 2 t2.uid 1 where used; Using index
EXPLAIN SELECT t1.gid, t3.uid from t1, t3 where t1.gid = t3.uid order by t3.skr,t1.gid;
table type possible_keys key key_len ref rows Extra
t1 index PRIMARY PRIMARY 4 NULL 6 Using index; Using temporary; Using filesort
t3 eq_ref PRIMARY PRIMARY 2 t1.gid 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 6 Using index; Using temporary; Using filesort
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 2 t1.gid 1 where used
EXPLAIN SELECT t1.gid, t3.uid from t1, t3 where t1.skr = t3.uid order by t1.gid,t3.skr;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort
t3 eq_ref PRIMARY PRIMARY 2 t1.skr 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 2 t1.skr 1 where used
drop table t1,t2,t3;
CREATE TABLE t1 (
`titre` char(80) NOT NULL default '',

4
mysql-test/r/range.result
View file

@ -15,8 +15,8 @@ event_date type event_id
1999-07-13 100600 26
1999-07-14 100600 10
explain select event_date,type,event_id from t1 WHERE type = 100601 and event_date >= "1999-07-01" AND event_date < "1999-07-15" AND (type=100600 OR type=100100) ORDER BY event_date;
Comment
Impossible WHERE
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE
select event_date,type,event_id from t1 WHERE event_date >= "1999-07-01" AND event_date <= "1999-07-15" AND (type=100600 OR type=100100) or event_date >= "1999-07-01" AND event_date <= "1999-07-15" AND type=100099;
event_date type event_id
1999-07-10 100100 24

92
mysql-test/r/select.result
View file

@ -1327,20 +1327,20 @@ fld3
select t2.fld3 from t2 where fld3 LIKE 'don_t_find_me_please%';
fld3
explain select t2.fld3 from t2 where fld3 = 'honeysuckle';
table type possible_keys key key_len ref rows Extra
t2 ref fld3 fld3 30 const 1 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref fld3 fld3 30 const 1 where used; Using index
explain select fld3 from t2 ignore index (fld3) where fld3 = 'honeysuckle';
table type possible_keys key key_len ref rows Extra
t2 index NULL fld3 30 NULL 1199 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL fld3 30 NULL 1199 where used; Using index
explain select fld3 from t2 use index (fld1) where fld3 = 'honeysuckle';
table type possible_keys key key_len ref rows Extra
t2 index NULL fld3 30 NULL 1199 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index NULL fld3 30 NULL 1199 where used; Using index
explain select fld3 from t2 use index (fld3) where fld3 = 'honeysuckle';
table type possible_keys key key_len ref rows Extra
t2 ref fld3 fld3 30 const 1 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref fld3 fld3 30 const 1 where used; Using index
explain select fld3 from t2 use index (fld1,fld3) where fld3 = 'honeysuckle';
table type possible_keys key key_len ref rows Extra
t2 ref fld3 fld3 30 const 1 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref fld3 fld3 30 const 1 where used; Using index
explain select fld3 from t2 ignore index (fld3,not_used);
Key column 'not_used' doesn't exist in table
explain select fld3 from t2 use index (not_used);
@ -1350,8 +1350,8 @@ fld3
honeysuckle
honoring
explain select t2.fld3 from t2 where fld3 >= 'honeysuckle' and fld3 <= 'honoring' order by fld3;
table type possible_keys key key_len ref rows Extra
t2 range fld3 fld3 30 NULL 2 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range fld3 fld3 30 NULL 2 where used; Using index
select fld1,fld3 from t2 where fld3="Colombo" or fld3 = "nondecreasing" order by fld3;
fld1 fld3
148504 Colombo
@ -1370,8 +1370,8 @@ fld1
250501
250502
explain select fld1 from t2 where fld1=250501 or fld1="250502";
table type possible_keys key key_len ref rows Extra
t2 range fld1 fld1 4 NULL 2 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range fld1 fld1 4 NULL 2 where used; Using index
select fld1 from t2 where fld1=250501 or fld1=250502 or fld1 >= 250505 and fld1 <= 250601 or fld1 between 250501 and 250502;
fld1
250501
@ -1379,8 +1379,8 @@ fld1
250505
250601
explain select fld1 from t2 where fld1=250501 or fld1=250502 or fld1 >= 250505 and fld1 <= 250601 or fld1 between 250501 and 250502;
table type possible_keys key key_len ref rows Extra
t2 range fld1 fld1 4 NULL 4 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range fld1 fld1 4 NULL 4 where used; Using index
select fld1,fld3 from t2 where companynr = 37 and fld3 like 'f%';
fld1 fld3
218401 faithful
@ -1806,21 +1806,21 @@ companynr rtrim(space(512+companynr))
select distinct fld3 from t2,t3 where t2.companynr = 34 and t2.fld1=t3.t2nr order by fld3;
fld3
explain select t3.t2nr,fld3 from t2,t3 where t2.companynr = 34 and t2.fld1=t3.t2nr order by t3.t2nr,fld3;
table type possible_keys key key_len ref rows Extra
t2 ALL fld1 NULL NULL NULL 1199 where used; Using temporary; Using filesort
t3 eq_ref PRIMARY PRIMARY 4 t2.fld1 1 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL fld1 NULL NULL NULL 1199 where used; Using temporary; Using filesort
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 t2.fld1 1 where used; Using index
explain select * from t3 as t1,t3 where t1.period=t3.period order by t3.period;
table type possible_keys key key_len ref rows Extra
t1 ALL period NULL NULL NULL 41810 Using temporary; Using filesort
t3 ref period period 4 t1.period 4181
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL period NULL NULL NULL 41810 Using temporary; Using filesort
1 SIMPLE t3 ref period period 4 t1.period 4181
explain select * from t3 as t1,t3 where t1.period=t3.period order by t3.period limit 10;
table type possible_keys key key_len ref rows Extra
t3 index period period 4 NULL 41810
t1 ref period period 4 t3.period 4181
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 index period period 4 NULL 41810
1 SIMPLE t1 ref period period 4 t3.period 4181
explain select * from t3 as t1,t3 where t1.period=t3.period order by t1.period limit 10;
table type possible_keys key key_len ref rows Extra
t1 index period period 4 NULL 41810
t3 ref period period 4 t1.period 4181
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index period period 4 NULL 41810
1 SIMPLE t3 ref period period 4 t1.period 4181
select period from t1;
period
9410
@ -1833,9 +1833,9 @@ select fld3,period from t2,t3 where t2.fld1 = 011401 and t2.fld1=t3.t2nr and t3.
fld3 period
breaking 1001
explain select fld3,period from t2,t3 where t2.fld1 = 011401 and t3.t2nr=t2.fld1 and 1001 = t3.period;
table type possible_keys key key_len ref rows Extra
t2 const fld1 fld1 4 const 1
t3 const PRIMARY,period PRIMARY 4 const 1
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 const fld1 fld1 4 const 1
1 SIMPLE t3 const PRIMARY,period PRIMARY 4 const 1
select fld3,period from t2,t1 where companynr*10 = 37*10;
fld3 period
breaking 9410
@ -2573,21 +2573,21 @@ fld1 fld1
select t2.companynr,companyname from t2 left join t4 using (companynr) where t4.companynr is null;
companynr companyname
explain select t2.companynr,companyname from t2 left join t4 using (companynr) where t4.companynr is null;
table type possible_keys key key_len ref rows Extra
t2 ALL NULL NULL NULL NULL 1199
t4 eq_ref PRIMARY PRIMARY 1 test.t2.companynr 1 where used; Not exists
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199
1 SIMPLE t4 eq_ref PRIMARY PRIMARY 1 test.t2.companynr 1 where used; Not exists
explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr is null;
table type possible_keys key key_len ref rows Extra
t4 ALL NULL NULL NULL NULL 12
t2 ALL NULL NULL NULL NULL 1199 where used; Not exists
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199 where used; Not exists
select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
companynr companynr
37 36
41 40
explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
table type possible_keys key key_len ref rows Extra
t2 ALL NULL NULL NULL NULL 1199 Using temporary
t4 index NULL PRIMARY 1 NULL 12 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199 Using temporary
1 SIMPLE t4 index NULL PRIMARY 1 NULL 12 where used; Using index
select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
fld1 companynr fld3 period
038008 37 reporters 1008
@ -3096,11 +3096,11 @@ select t2.fld1,sum(price) from t3,t2 where t2.fld1 = t3.t2nr and t3.companynr =
fld1 sum(price)
038008 234298
explain select fld3 from t2 where 1>2 or 2>3;
Comment
Impossible WHERE
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE
explain select fld3 from t2 where fld1=fld1;
table type possible_keys key key_len ref rows Extra
t2 ALL NULL NULL NULL NULL 1199
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199
select companynr,fld1 from t2 HAVING fld1=250501 or fld1=250502;
companynr fld1
34 250501
@ -3151,8 +3151,8 @@ select count(*) from t3 where companynr=512 and price2=76234234;
count(*)
4181
explain select min(fld1),max(fld1),count(*) from t2;
Comment
Select tables optimized away
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Select tables optimized away
select min(fld1),max(fld1),count(*) from t2;
min(fld1) max(fld1) count(*)
0 1232609 1199

60
mysql-test/r/subselect.result
View file

@ -1,7 +1,7 @@
select (select 2);
(select 2)
2
drop table if exists t1,t2,t3,t4,attend,clinic;
drop table if exists t1,t2,t3,t4,t5,attend,clinic;
create table t1 (a int);
create table t2 (a int, b int);
create table t3 (a int);
@ -46,6 +46,13 @@ a b
2 7
3 8
4 8
explain select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)
union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 where used
3 UNION t4 ALL NULL NULL NULL NULL 3 where used; Using filesort
4 SUBSELECT t2 ALL NULL NULL NULL NULL 2
2 SUBSELECT t3 ALL NULL NULL NULL NULL 3 Using filesort
select (select a from t3 where a<t2.a*4 order by 1 desc limit 1), a from t2;
(select a from t3 where a<t2.a*4 order by 1 desc limit 1) a
3 1
@ -54,6 +61,12 @@ 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 t3.a from t3 where a<8 order by 1 desc limit 1) a
7 2
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;
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
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);
a
2
@ -67,6 +80,11 @@ b (select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2)
8 7.5000
8 4.5000
9 7.5000
explain select b,(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) from t4;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t4 ALL NULL NULL NULL NULL 3
2 DEPENDENT SUBSELECT t2 ALL NULL NULL NULL NULL 2
3 DEPENDENT SUBSELECT t3 ALL NULL NULL NULL NULL 3 where used
select * from t3 where exists (select * from t2 where t2.b=t3.a);
a
7
@ -82,6 +100,28 @@ select b,max(a) as ma from t4 group by b having b >= (select max(t2.a)
from t2 where t2.b=t4.b);
b ma
7 12
create table t5 (a int);
select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a) a
NULL 1
2 2
insert into t5 values (5);
select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a) a
NULL 1
2 2
insert into t5 values (2);
select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
(select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a) a
NULL 1
2 2
explain select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2
2 DEPENDENT SUBSELECT t1 system NULL NULL NULL NULL 1 where used
3 DEPENDENT UNION t5 ALL NULL NULL NULL NULL 2 where used
select (select a from t1 where t1.a=t2.a union all select a from t5 where t5.a=t2.a), a from t2;
Subselect return more than 1 record
create table attend (patient_uq int, clinic_uq int, index i1 (clinic_uq));
create table clinic( uq int primary key, name char(25));
insert into clinic values(1,"Oblastnaia bolnitsa"),(2,"Bolnitsa Krasnogo Kresta");
@ -91,4 +131,20 @@ patient_uq clinic_uq
1 1
1 2
2 2
drop table t1,t2,t3,t4,attend,clinic;
drop table if exists t1,t2,t3;
CREATE TABLE t3 (a varchar(20),b char(1) NOT NULL default '0');
INSERT INTO t3 VALUES ('W','a'),('A','c'),('J','b');
CREATE TABLE t2 (a varchar(20),b int NOT NULL default '0');
INSERT INTO t2 VALUES ('W','1'),('A','3'),('J','2');
CREATE TABLE t1 (a varchar(20),b date NOT NULL default '0000-00-00');
INSERT INTO t1 VALUES ('W','1732-02-22'),('A','1735-10-30'),('J','1743-04-13');
SELECT * FROM t1 WHERE b = (SELECT MIN(b) FROM t1);
a b
W 1732-02-22
SELECT * FROM t2 WHERE b = (SELECT MIN(b) FROM t2);
a b
W 1
SELECT * FROM t3 WHERE b = (SELECT MIN(b) FROM t3);
a b
W a
drop table t1,t2,t3,t4,t5,attend,clinic;

4
mysql-test/r/type_datetime.result
View file

@ -75,6 +75,6 @@ date numfacture expedition
0000-00-00 00:00:00 0 0001-00-00 00:00:00
0000-00-00 00:00:00 1212 0001-00-00 00:00:00
EXPLAIN SELECT * FROM t1 WHERE expedition='0001-00-00 00:00:00';
table type possible_keys key key_len ref rows Extra
t1 ref expedition expedition 8 const 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref expedition expedition 8 const 1 where used
drop table t1;

38
mysql-test/r/union.result
View file

@ -85,35 +85,31 @@ a b
2 b
1 a
explain (select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4
t2 ALL NULL NULL NULL NULL 4 Using filesort
(select sql_calc_found_rows a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 2;
a b
1 a
2 b
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 UNION t2 ALL NULL NULL NULL NULL 4 Using filesort
select found_rows();
FOUND_ROWS()
6
0
explain select a,b from t1 union all select a,b from t2;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4
t2 ALL NULL NULL NULL NULL 4
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 UNION t2 ALL NULL NULL NULL NULL 4
explain select xx from t1 union select 1;
Unknown column 'xx' in 'field list'
explain select a,b from t1 union select 1;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4
0 0 No tables used
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4
2 UNION No tables used
explain select 1 union select a,b from t1 union select 1;
table type possible_keys key key_len ref rows Extra
0 0 No tables used
t1 ALL NULL NULL NULL NULL 4
0 0 No tables used
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY No tables used
2 UNION t1 ALL NULL NULL NULL NULL 4
3 UNION No tables used
explain select a,b from t1 union select 1 limit 0;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 4
0 0 Impossible WHERE
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY Impossible WHERE
2 UNION Impossible WHERE
select a,b from t1 into outfile 'skr' union select a,b from t2;
Wrong usage of UNION and INTO
select a,b from t1 order by a union select a,b from t2;

16
mysql-test/r/user_var.result
View file

@ -18,15 +18,15 @@ i @vv1:=if(sv1.i,1,0) @vv2:=if(sv2.i,1,0) @vv3:=if(sv3.i,1,0) @vv1+@vv2+@vv3
1 1 0 1 2
2 1 0 0 1
explain select * from t1 where i=@vv1;
table type possible_keys key key_len ref rows Extra
t1 ref i i 4 const 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref i i 4 const 1 where used
explain select * from t1 where @vv1:=@vv1+1 and i=@vv1;
table type possible_keys key key_len ref rows Extra
t1 ALL NULL NULL NULL NULL 3 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 where used
explain select @vv1:=i from t1 where i=@vv1;
table type possible_keys key key_len ref rows Extra
t1 index NULL i 4 NULL 3 where used; Using index
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL i 4 NULL 3 where used; Using index
explain select * from t1 where i=@vv1;
table type possible_keys key key_len ref rows Extra
t1 ref i i 4 const 1 where used
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref i i 4 const 1 where used
drop table t1,t2;

4
mysql-test/r/varbinary.result
View file

@ -12,8 +12,8 @@ create table t1 (ID int(8) unsigned zerofill not null auto_increment,UNIQ bigint
insert into t1 set UNIQ=0x38afba1d73e6a18a;
insert into t1 set UNIQ=123;
explain select * from t1 where UNIQ=0x38afba1d73e6a18a;
table type possible_keys key key_len ref rows Extra
t1 const UNIQ UNIQ 8 const 1
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 const UNIQ UNIQ 8 const 1
drop table t1;
select x'hello';
You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near 'x'hello'' at line 1

32
mysql-test/t/subselect.test
View file

@ -1,6 +1,6 @@
select (select 2);
drop table if exists t1,t2,t3,t4,attend,clinic;
drop table if exists t1,t2,t3,t4,t5,attend,clinic;
create table t1 (a int);
create table t2 (a int, b int);
create table t3 (a int);
@ -19,13 +19,18 @@ select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)
union (select * from t4 order by a limit 2) limit 3;
select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)
union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a);
explain select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)
union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a);
select (select a from t3 where a<t2.a*4 order by 1 desc limit 1), a from t2;
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;
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 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 where t3.a > t1.a) 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 where t3.a < t1.a) order by 1 desc limit 1);
select b,(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) from t4;
explain select b,(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) from t4;
select * from t3 where exists (select * from t2 where t2.b=t3.a);
select * from t3 where not exists (select * from t2 where t2.b=t3.a);
insert into t4 values (12,7),(1,7),(10,9),(9,6),(7,6),(3,9);
@ -33,11 +38,32 @@ select b,max(a) as ma from t4 group by b having b < (select max(t2.a)
from t2 where t2.b=t4.b);
select b,max(a) as ma from t4 group by b having b >= (select max(t2.a)
from t2 where t2.b=t4.b);
create table t5 (a int);
select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
insert into t5 values (5);
select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
insert into t5 values (2);
select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
explain select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2;
-- error 1230
select (select a from t1 where t1.a=t2.a union all select a from t5 where t5.a=t2.a), a from t2;
create table attend (patient_uq int, clinic_uq int, index i1 (clinic_uq));
create table clinic( uq int primary key, name char(25));
insert into clinic values(1,"Oblastnaia bolnitsa"),(2,"Bolnitsa Krasnogo Kresta");
insert into attend values (1,1),(1,2),(2,2),(1,3);
select * from attend where exists (select * from clinic where uq = clinic_uq);
drop table t1,t2,t3,t4,attend,clinic;
# different tipes & group functions
drop table if exists t1,t2,t3;
CREATE TABLE t3 (a varchar(20),b char(1) NOT NULL default '0');
INSERT INTO t3 VALUES ('W','a'),('A','c'),('J','b');
CREATE TABLE t2 (a varchar(20),b int NOT NULL default '0');
INSERT INTO t2 VALUES ('W','1'),('A','3'),('J','2');
CREATE TABLE t1 (a varchar(20),b date NOT NULL default '0000-00-00');
INSERT INTO t1 VALUES ('W','1732-02-22'),('A','1735-10-30'),('J','1743-04-13');
SELECT * FROM t1 WHERE b = (SELECT MIN(b) FROM t1);
SELECT * FROM t2 WHERE b = (SELECT MIN(b) FROM t2);
SELECT * FROM t3 WHERE b = (SELECT MIN(b) FROM t3);
drop table t1,t2,t3,t4,t5,attend,clinic;

2
mysql-test/t/union.test
View file

@ -21,7 +21,7 @@ select 't1',b,count(*) from t1 group by b UNION select 't2',b,count(*) from t2 g
(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1);
(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
explain (select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
(select sql_calc_found_rows a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 2;
#(select sql_calc_found_rows a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 2;
select found_rows();
#

6
sql/item.cc
View file

@ -468,7 +468,8 @@ bool Item_field::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
s= s->outer_select())
if( !s->depended )
{
s->depended= 1;
// Select is depended of outer select
s->depended= s->master_unit()->depended= 1;
//Tables will be reopened many times
for (TABLE_LIST *tbl=
(TABLE_LIST*)s->table_list.first;
@ -819,7 +820,8 @@ bool Item_ref::fix_fields(THD *thd,TABLE_LIST *tables, Item **reference)
s= s->outer_select())
if( !s->depended )
{
s->depended= 1; //Select is depended of outer select
// Select is depended of outer select
s->depended= s->master_unit()->depended= 1;
//Tables will be reopened many times
for (TABLE_LIST *tbl=
(TABLE_LIST*)s->table_list.first;

259
sql/item_subselect.cc
View file

@ -23,9 +23,6 @@ SUBSELECT TODO:
- remove double 'having' & 'having_list' from JOIN
(sql_select.h/sql_select.cc)
- subselect in HAVING clause
- add subselect union select (sql_union.cc)
*/
#ifdef __GNUC__
@ -37,27 +34,17 @@ SUBSELECT TODO:
Item_subselect::Item_subselect(THD *thd, st_select_lex *select_lex,
select_subselect *result):
assigned(0), executed(0), optimized(0), error(0)
Item(), engine_owner(1), value_assigned(0)
{
DBUG_ENTER("Item_subselect::Item_subselect");
DBUG_PRINT("subs", ("select_lex 0x%xl", (long) select_lex));
this->result= result;
SELECT_LEX_UNIT *unit= select_lex->master_unit();
unit->offset_limit_cnt= unit->global_parameters->offset_limit;
unit->select_limit_cnt= unit->global_parameters->select_limit+
unit->global_parameters ->offset_limit;
if (unit->select_limit_cnt < unit->global_parameters->select_limit)
unit->select_limit_cnt= HA_POS_ERROR; // no limit
if (unit->select_limit_cnt == HA_POS_ERROR)
select_lex->options&= ~OPTION_FOUND_ROWS;
join= new JOIN(thd, select_lex->item_list, select_lex->options, result);
if (!join || !result)
{
//out of memory
thd->fatal_error= 1;
my_printf_error(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
}
this->select_lex= select_lex;
if (select_lex->next_select())
engine= new subselect_union_engine(thd, select_lex->master_unit(), result,
this);
else
engine= new subselect_single_select_engine(thd, select_lex, result,
this);
assign_null();
/*
item value is NULL if select_subselect not changed this value
@ -67,6 +54,12 @@ Item_subselect::Item_subselect(THD *thd, st_select_lex *select_lex,
DBUG_VOID_RETURN;
}
Item_subselect::~Item_subselect()
{
if (engine_owner)
delete engine;
}
void Item_subselect::make_field (Send_field *tmp_field)
{
if (null_value)
@ -84,62 +77,24 @@ void Item_subselect::make_field (Send_field *tmp_field)
bool Item_subselect::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
{
// Is it one field subselect?
if (select_lex->item_list.elements > max_columns)
if (engine->cols() > max_columns)
{
my_printf_error(ER_SUBSELECT_NO_1_COL, ER(ER_SUBSELECT_NO_1_COL), MYF(0));
my_message(ER_SUBSELECT_NO_1_COL, ER(ER_SUBSELECT_NO_1_COL), MYF(0));
return 1;
}
SELECT_LEX *save_select= thd->lex.select;
thd->lex.select= select_lex;
if(join->prepare((TABLE_LIST*) select_lex->table_list.first,
select_lex->where,
(ORDER*) select_lex->order_list.first,
(ORDER*) select_lex->group_list.first,
select_lex->having,
(ORDER*) 0, select_lex,
select_lex->master_unit()))
return 1;
thd->lex.select= save_select;
return 0;
int res= engine->prepare();
fix_length_and_dec();
return res;
}
int Item_subselect::exec()
void Item_subselect::fix_length_and_dec()
{
DBUG_ENTER("Item_subselect::exec");
if (!optimized)
{
optimized=1;
if (join->optimize())
{
executed= 1;
DBUG_RETURN(join->error?join->error:1);
}
}
if (join->select_lex->depended && executed)
{
if (join->reinit())
{
error= 1;
DBUG_RETURN(1);
}
assign_null();
executed= assigned= 0;
}
if (!executed)
{
SELECT_LEX *save_select= join->thd->lex.select;
join->thd->lex.select= select_lex;
join->exec();
join->thd->lex.select= save_select;
executed= 1;
DBUG_RETURN(join->error);
}
DBUG_RETURN(0);
engine->fix_length_and_dec();
}
inline table_map Item_subselect::used_tables() const
{
return (table_map) select_lex->depended ? 1L : 0L;
return (table_map) engine->depended() ? 1L : 0L;
}
Item_singleval_subselect::Item_singleval_subselect(THD *thd,
@ -150,6 +105,12 @@ Item_singleval_subselect::Item_singleval_subselect(THD *thd,
maybe_null= 1;
}
void Item_singleval_subselect::fix_length_and_dec()
{
engine->fix_length_and_dec();
res_type= engine->type();
}
Item::Type Item_subselect::type() const
{
return SUBSELECT_ITEM;
@ -157,21 +118,21 @@ Item::Type Item_subselect::type() const
double Item_singleval_subselect::val ()
{
if (exec())
if (engine->exec())
return 0;
return real_value;
}
longlong Item_singleval_subselect::val_int ()
{
if (exec())
if (engine->exec())
return 0;
return int_value;
}
String *Item_singleval_subselect::val_str (String *str)
{
if (exec() || null_value)
if (engine->exec() || null_value)
return 0;
return &str_value;
}
@ -187,25 +148,177 @@ Item_exists_subselect::Item_exists_subselect(THD *thd,
select_lex->select_limit= 1; // we need only 1 row to determinate existence
}
void Item_exists_subselect::fix_length_and_dec()
{
max_length= 1;
}
double Item_exists_subselect::val ()
{
if (exec())
if (engine->exec())
return 0;
return (double) value;
}
longlong Item_exists_subselect::val_int ()
{
if (exec())
if (engine->exec())
return 0;
return value;
}
String *Item_exists_subselect::val_str(String *str)
{
if (exec())
if (engine->exec())
return 0;
str->set(value);
return str;
}
subselect_single_select_engine::subselect_single_select_engine(THD *thd,
st_select_lex *select,
select_subselect *result,
Item_subselect *item):
subselect_engine(thd, item, result),
executed(0), optimized(0)
{
select_lex= select;
SELECT_LEX_UNIT *unit= select_lex->master_unit();
unit->offset_limit_cnt= unit->global_parameters->offset_limit;
unit->select_limit_cnt= unit->global_parameters->select_limit+
unit->global_parameters ->offset_limit;
if (unit->select_limit_cnt < unit->global_parameters->select_limit)
unit->select_limit_cnt= HA_POS_ERROR; // no limit
if (unit->select_limit_cnt == HA_POS_ERROR)
select_lex->options&= ~OPTION_FOUND_ROWS;
join= new JOIN(thd, select_lex->item_list, select_lex->options, result);
if (!join || !result)
{
//out of memory
thd->fatal_error= 1;
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
}
this->select_lex= select_lex;
}
subselect_union_engine::subselect_union_engine(THD *thd,
st_select_lex_unit *u,
select_subselect *result,
Item_subselect *item):
subselect_engine(thd, item, result)
{
unit= u;
if( !result)
{
//out of memory
thd->fatal_error= 1;
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
}
unit->item= item;
}
int subselect_single_select_engine::prepare()
{
SELECT_LEX *save_select= thd->lex.select;
thd->lex.select= select_lex;
if(join->prepare((TABLE_LIST*) select_lex->table_list.first,
select_lex->where,
(ORDER*) select_lex->order_list.first,
(ORDER*) select_lex->group_list.first,
select_lex->having,
(ORDER*) 0, select_lex,
select_lex->master_unit(), 0))
return 1;
thd->lex.select= save_select;
return 0;
}
int subselect_union_engine::prepare()
{
return unit->prepare(thd, result);
}
void subselect_single_select_engine::fix_length_and_dec()
{
List_iterator_fast<Item> li(select_lex->item_list);
Item *sel_item= li++;
item->max_length= sel_item->max_length;
res_type= sel_item->result_type();
item->decimals= sel_item->decimals;
}
void subselect_union_engine::fix_length_and_dec()
{
uint32 mlen= 0, len;
Item *sel_item= 0;
for(SELECT_LEX *sl= unit->first_select(); sl; sl= sl->next_select())
{
List_iterator_fast<Item> li(sl->item_list);
Item *s_item= li++;
if ((len= s_item->max_length))
mlen= len;
if (!sel_item)
sel_item= s_item;
}
item->max_length= mlen;
res_type= sel_item->result_type();
item->decimals= sel_item->decimals;
}
int subselect_single_select_engine::exec()
{
DBUG_ENTER("subselect_single_select_engine::exec");
if (!optimized)
{
optimized=1;
if (join->optimize())
{
executed= 1;
DBUG_RETURN(join->error?join->error:1);
}
}
if (select_lex->depended && executed)
{
if (join->reinit())
DBUG_RETURN(1);
item->assign_null();
item->assigned((executed= 0));
}
if (!executed)
{
SELECT_LEX *save_select= join->thd->lex.select;
join->thd->lex.select= select_lex;
join->exec();
join->thd->lex.select= save_select;
executed= 1;
DBUG_RETURN(join->error||thd->fatal_error);
}
DBUG_RETURN(0);
}
int subselect_union_engine::exec()
{
return unit->exec();
}
uint subselect_single_select_engine::cols()
{
return select_lex->item_list.elements;
}
uint subselect_union_engine::cols()
{
return unit->first_select()->item_list.elements;
}
bool subselect_single_select_engine::depended()
{
return select_lex->depended;
}
bool subselect_union_engine::depended()
{
return unit->depended;
}

135
sql/item_subselect.h
View file

@ -21,30 +21,24 @@
#endif
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)
@ -52,18 +46,22 @@ 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 *);
bool fix_fields(THD *thd, TABLE_LIST *tables, Item **ref);
virtual void fix_length_and_dec();
table_map used_tables() const;
friend class select_subselect;
@ -75,18 +73,10 @@ 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):
@ -98,12 +88,20 @@ 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 *);
Item *new_item() { return new Item_singleval_subselect(this); }
enum Item_result result_type() const { return res_type; }
void fix_length_and_dec();
friend class select_singleval_subselect;
};
@ -112,12 +110,8 @@ 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):
@ -125,11 +119,78 @@ 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();
double val();
String *val_str(String*);
void fix_length_and_dec();
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 */
enum Item_result res_type; /* type of results */
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;
res_type= STRING_RESULT;
}
virtual int prepare()= 0;
virtual void fix_length_and_dec()= 0;
virtual int exec()= 0;
virtual uint cols()= 0; /* return number of columnss in select */
virtual bool depended()= 0; /* depended from outer select */
enum Item_result type() { return res_type; }
};
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 void fix_length_and_dec();
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 void fix_length_and_dec();
virtual int exec();
virtual uint cols();
virtual bool depended();
};

9
sql/mysql_priv.h
View file

@ -389,9 +389,14 @@ int handle_select(THD *thd, LEX *lex, select_result *result);
int mysql_select(THD *thd,TABLE_LIST *tables,List<Item> &list,COND *conds,
ORDER *order, ORDER *group,Item *having,ORDER *proc_param,
ulong select_type,select_result *result,
SELECT_LEX_UNIT *unit);
SELECT_LEX_UNIT *unit, SELECT_LEX *select_lex,
bool fake_select_lex);
void fix_tables_pointers(SELECT_LEX *select_lex);
int mysql_explain_select(THD *thd, SELECT_LEX *sl, char const *type,
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,
Item_result_field ***copy_func, Field **from_field,
bool group,bool modify_item);

1
sql/mysqld.cc
View file

@ -1647,6 +1647,7 @@ static int my_message_sql(uint error, const char *str,
if ((thd=current_thd))
{
NET *net= &thd->net;
net->report_error= 1;
if (!net->last_error[0]) // Return only first message
{
strmake(net->last_error,str,sizeof(net->last_error)-1);

3
sql/net_pkg.cc
View file

@ -66,10 +66,9 @@ void send_error(THD *thd, uint sql_errno, const char *err)
else
{
length=(uint) strlen(err);
set_if_smaller(length,MYSQL_ERRMSG_SIZE-1);
}
VOID(net_write_command(net,(uchar) 255, "", 0, (char*) err,length));
thd->fatal_error=0; // Error message is given
thd->net.report_error= 0;
DBUG_VOID_RETURN;
}

39
sql/net_serv.cc
View file

@ -99,6 +99,7 @@ my_bool my_net_init(NET *net, Vio* vio)
net->where_b = net->remain_in_buf=0;
net->last_errno=0;
net->query_cache_query=0;
net->report_error= 0;
if (vio != 0) /* If real connection */
{
@ -134,8 +135,9 @@ my_bool net_realloc(NET *net, ulong length)
if (length >= net->max_packet_size)
{
DBUG_PRINT("error",("Packet too large (%lu)", length));
net->error=1;
net->last_errno=ER_NET_PACKET_TOO_LARGE;
net->error= 1;
net->report_error= 1;
net->last_errno= ER_NET_PACKET_TOO_LARGE;
return 1;
}
pkt_length = (length+IO_SIZE-1) & ~(IO_SIZE-1);
@ -147,9 +149,10 @@ my_bool net_realloc(NET *net, ulong length)
NET_HEADER_SIZE + COMP_HEADER_SIZE,
MYF(MY_WME))))
{
net->error=1;
net->error= 1;
net->report_error= 1;
#ifdef MYSQL_SERVER
net->last_errno=ER_OUT_OF_RESOURCES;
net->last_errno= ER_OUT_OF_RESOURCES;
#endif
return 1;
}
@ -369,10 +372,12 @@ net_real_write(NET *net,const char *packet,ulong len)
COMP_HEADER_SIZE, MYF(MY_WME))))
{
#ifdef MYSQL_SERVER
net->last_errno=ER_OUT_OF_RESOURCES;
net->error=2;
net->last_errno= ER_OUT_OF_RESOURCES;
net->error= 2;
//TODO is it needed to set this variable if we have no socket
net->report_error= 1;
#endif
net->reading_or_writing=0;
net->reading_or_writing= 0;
DBUG_RETURN(1);
}
memcpy(b+header_length,packet,len);
@ -422,9 +427,10 @@ net_real_write(NET *net,const char *packet,ulong len)
my_progname,vio_errno(net->vio));
#endif /* EXTRA_DEBUG */
#ifdef MYSQL_SERVER
net->last_errno=ER_NET_ERROR_ON_WRITE;
net->last_errno= ER_NET_ERROR_ON_WRITE;
#endif
net->error=2; /* Close socket */
net->error= 2; /* Close socket */
net->report_error= 1;
goto end;
}
retry_count=0;
@ -450,7 +456,8 @@ net_real_write(NET *net,const char *packet,ulong len)
continue;
}
#endif /* defined(THREAD_SAFE_CLIENT) && !defined(MYSQL_SERVER) */
net->error=2; /* Close socket */
net->error= 2; /* Close socket */
net->report_error= 1;
#ifdef MYSQL_SERVER
net->last_errno= (interrupted ? ER_NET_WRITE_INTERRUPTED :
ER_NET_ERROR_ON_WRITE);
@ -586,9 +593,10 @@ my_real_read(NET *net, ulong *complen)
my_progname,vio_errno(net->vio));
#endif /* EXTRA_DEBUG */
len= packet_error;
net->error=2; /* Close socket */
net->error= 2; /* Close socket */
net->report_error= 1;
#ifdef MYSQL_SERVER
net->last_errno=ER_NET_FCNTL_ERROR;
net->last_errno= ER_NET_FCNTL_ERROR;
#endif
goto end;
}
@ -618,7 +626,8 @@ my_real_read(NET *net, ulong *complen)
remain,vio_errno(net->vio), length,
thr_got_alarm(&alarmed)));
len= packet_error;
net->error=2; /* Close socket */
net->error= 2; /* Close socket */
net->report_error= 1;
#ifdef MYSQL_SERVER
net->last_errno= (interrupted ? ER_NET_READ_INTERRUPTED :
ER_NET_READ_ERROR);
@ -648,6 +657,7 @@ my_real_read(NET *net, ulong *complen)
#endif
}
len= packet_error;
net->report_error= 1;
#ifdef MYSQL_SERVER
net->last_errno=ER_NET_PACKETS_OUT_OF_ORDER;
#endif
@ -821,7 +831,8 @@ my_net_read(NET *net)
if (my_uncompress((byte*) net->buff + net->where_b, &packet_len,
&complen))
{
net->error=2; /* caller will close socket */
net->error= 2; /* caller will close socket */
net->report_error= 1;
#ifdef MYSQL_SERVER
net->last_errno=ER_NET_UNCOMPRESS_ERROR;
#endif

17
sql/sql_base.cc
View file

@ -1852,8 +1852,9 @@ find_field_in_tables(THD *thd,Item_field *item,TABLE_LIST *tables,
{
if (!report_error) // Returns first found
break;
my_printf_error(ER_NON_UNIQ_ERROR,ER(ER_NON_UNIQ_ERROR),MYF(0),
name,thd->where);
if (report_error)
my_printf_error(ER_NON_UNIQ_ERROR,ER(ER_NON_UNIQ_ERROR),MYF(0),
name,thd->where);
return (Field*) 0;
}
found=field;
@ -1917,8 +1918,8 @@ find_item_in_list(Item *find, List<Item> &items, bool report_error)
}
}
if (!found && report_error)
my_printf_error(ER_BAD_FIELD_ERROR,ER(ER_BAD_FIELD_ERROR),MYF(0),
find->full_name(),current_thd->where);
my_printf_error(ER_BAD_FIELD_ERROR, ER(ER_BAD_FIELD_ERROR), MYF(0),
find->full_name(), current_thd->where);
return found;
}
@ -2390,8 +2391,8 @@ bool remove_table_from_cache(THD *thd, const char *db, const char *table_name,
int setup_ftfuncs(THD *thd)
{
List_iterator<Item_func_match> li(thd->lex.select->ftfunc_list),
lj(thd->lex.select->ftfunc_list);
List_iterator<Item_func_match> li(*(thd->lex.select->ftfunc_list)),
lj(*(thd->lex.select->ftfunc_list));
Item_func_match *ftf, *ftf2;
while ((ftf=li++))
@ -2412,9 +2413,9 @@ int setup_ftfuncs(THD *thd)
int init_ftfuncs(THD *thd, bool no_order)
{
if (thd->lex.select->ftfunc_list.elements)
if (thd->lex.select->ftfunc_list->elements)
{
List_iterator<Item_func_match> li(thd->lex.select->ftfunc_list);
List_iterator<Item_func_match> li(*(thd->lex.select->ftfunc_list));
Item_func_match *ifm;
DBUG_PRINT("info",("Performing FULLTEXT search"));
thd->proc_info="FULLTEXT initialization";

78
sql/sql_class.cc
View file

@ -384,6 +384,28 @@ CHANGED_TABLE_LIST* THD::changed_table_dup(const char *key, long key_length)
return new_table;
}
int THD::send_explain_fields(select_result *result)
{
List<Item> field_list;
Item *item;
field_list.push_back(new Item_int("id",0,3));
field_list.push_back(new Item_empty_string("select_type",19));
field_list.push_back(new Item_empty_string("table",NAME_LEN));
field_list.push_back(new Item_empty_string("type",10));
field_list.push_back(item=new Item_empty_string("possible_keys",
NAME_LEN*MAX_KEY));
item->maybe_null=1;
field_list.push_back(item=new Item_empty_string("key",NAME_LEN));
item->maybe_null=1;
field_list.push_back(item=new Item_int("key_len",0,3));
item->maybe_null=1;
field_list.push_back(item=new Item_empty_string("ref",
NAME_LEN*MAX_REF_PARTS));
item->maybe_null=1;
field_list.push_back(new Item_real("rows",0.0,0,10));
field_list.push_back(new Item_empty_string("Extra",255));
return (result->send_fields(field_list,1));
}
#ifdef SIGNAL_WITH_VIO_CLOSE
void THD::close_active_vio()
@ -446,13 +468,19 @@ bool select_send::send_data(List<Item> &items)
if (item->send(thd, packet))
{
packet->free(); // Free used
my_error(ER_OUT_OF_RESOURCES,MYF(0));
my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
DBUG_RETURN(1);
}
}
thd->sent_row_count++;
bool error=my_net_write(&thd->net,(char*) packet->ptr(),packet->length());
DBUG_RETURN(error);
if (!thd->net.report_error)
{
DBUG_RETURN(my_net_write(&thd->net,
(char*) packet->ptr(),
packet->length()));
}
else
DBUG_RETURN(1);
}
bool select_send::send_eof()
@ -462,8 +490,13 @@ bool select_send::send_eof()
{
mysql_unlock_tables(thd, thd->lock); thd->lock=0;
}
::send_eof(thd);
return 0;
if (!thd->net.report_error)
{
::send_eof(thd);
return 0;
}
else
return 1;
}
@ -499,7 +532,7 @@ select_export::prepare(List<Item> &list, SELECT_LEX_UNIT *u)
option);
if (!access(path,F_OK))
{
my_error(ER_FILE_EXISTS_ERROR,MYF(0),exchange->file_name);
my_error(ER_FILE_EXISTS_ERROR, MYF(0), exchange->file_name);
return 1;
}
/* Create the file world readable */
@ -685,9 +718,9 @@ err:
}
void select_export::send_error(uint errcode,const char *err)
void select_export::send_error(uint errcode, const char *err)
{
::send_error(thd,errcode,err);
my_message(errcode, err, MYF(0));;
(void) end_io_cache(&cache);
(void) my_close(file,MYF(0));
file= -1;
@ -699,9 +732,7 @@ bool select_export::send_eof()
int error=test(end_io_cache(&cache));
if (my_close(file,MYF(MY_WME)))
error=1;
if (error)
::send_error(thd);
else
if (!error)
::send_ok(thd,row_count);
file= -1;
return error;
@ -774,7 +805,7 @@ bool select_dump::send_data(List<Item> &items)
}
if (row_count++ > 1)
{
my_error(ER_TOO_MANY_ROWS,MYF(0));
my_error(ER_TOO_MANY_ROWS, MYF(0));
goto err;
}
while ((item=li++))
@ -799,7 +830,7 @@ err:
void select_dump::send_error(uint errcode,const char *err)
{
::send_error(thd,errcode,err);
my_message(errcode, err, MYF(0));
(void) end_io_cache(&cache);
(void) my_close(file,MYF(0));
(void) my_delete(path,MYF(0)); // Delete file on error
@ -811,9 +842,7 @@ bool select_dump::send_eof()
int error=test(end_io_cache(&cache));
if (my_close(file,MYF(MY_WME)))
error=1;
if (error)
::send_error(thd);
else
if (!error)
::send_ok(thd,row_count);
file= -1;
return error;
@ -828,8 +857,9 @@ bool select_singleval_subselect::send_data(List<Item> &items)
{
DBUG_ENTER("select_singleval_subselect::send_data");
Item_singleval_subselect *it= (Item_singleval_subselect *)item;
if (it->assigned){
my_printf_error(ER_SUBSELECT_NO_1_ROW, ER(ER_SUBSELECT_NO_1_ROW), MYF(0));
if (it->assigned()){
thd->fatal_error= 1;
my_message(ER_SUBSELECT_NO_1_ROW, ER(ER_SUBSELECT_NO_1_ROW), MYF(0));
DBUG_RETURN(1);
}
if (unit->offset_limit_cnt)
@ -847,15 +877,19 @@ bool select_singleval_subselect::send_data(List<Item> &items)
if ((it->null_value= val_item->is_null()))
{
it->assign_null();
} else {
}
else
{
it->max_length= val_item->max_length;
it->decimals= val_item->decimals;
it->binary= val_item->binary;
val_item->val_str(&it->str_value);
it->int_value= val_item->val_int();
String *s= val_item->val_str(&it->str_value);
if (s != &it->str_value)
it->str_value.set(*s, 0, s->length());
it->res_type= val_item->result_type();
}
it->assigned= 1;
it->assigned(1);
DBUG_RETURN(0);
}
@ -869,7 +903,7 @@ bool select_exists_subselect::send_data(List<Item> &items)
DBUG_RETURN(0);
}
it->value= 1;
it->assigned= 1;
it->assigned(1);
DBUG_RETURN(0);
}

7
sql/sql_class.h
View file

@ -330,6 +330,7 @@ typedef struct st_prep_stmt
class delayed_insert;
class select_result;
#define THD_SENTRY_MAGIC 0xfeedd1ff
#define THD_SENTRY_GONE 0xdeadbeef
@ -491,6 +492,7 @@ public:
uint server_status,open_options;
uint32 query_length;
uint32 db_length;
uint select_number; //number of select (used for EXPLAIN)
/* variables.transaction_isolation is reset to this after each commit */
enum_tx_isolation session_tx_isolation;
char scramble[9];
@ -504,7 +506,7 @@ public:
bool query_error, bootstrap, cleanup_done;
bool safe_to_cache_query;
bool volatile killed;
bool prepare_command;
bool prepare_command;
Item_param *params; // Pointer to array of params
/*
@ -621,6 +623,7 @@ public:
void add_changed_table(TABLE *table);
void add_changed_table(const char *key, long key_length);
CHANGED_TABLE_LIST * changed_table_dup(const char *key, long key_length);
int send_explain_fields(select_result *result);
};
/*
@ -666,7 +669,7 @@ public:
virtual void initialize_tables (JOIN *join=0) {}
virtual void send_error(uint errcode,const char *err)
{
::send_error(thd,errcode,err);
my_message(errcode, err, MYF(0));
}
virtual bool send_eof()=0;
virtual void abort() {}

23
sql/sql_derived.cc
View file

@ -28,7 +28,8 @@
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
@ -37,7 +38,7 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t)
SELECT_LEX *sl= unit->first_select();
List<Item> item_list;
TABLE *table;
int res;
int res= 0;
select_union *derived_result;
TABLE_LIST *tables= (TABLE_LIST *)sl->table_list.first;
TMP_TABLE_PARAM tmp_table_param;
@ -56,7 +57,8 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t)
{
if (cursor->derived)
{
res=mysql_derived(thd, lex, (SELECT_LEX_UNIT *)cursor->derived, cursor);
res=mysql_derived(thd, lex, (SELECT_LEX_UNIT *)cursor->derived,
cursor, 0);
if (res) DBUG_RETURN(res);
}
}
@ -66,7 +68,7 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t)
while ((item= it++))
item_list.push_back(item);
if (!(res=open_and_lock_tables(thd,tables)))
if (tables_is_opened || !(res=open_and_lock_tables(thd,tables)))
{
if (tables && setup_fields(thd,tables,item_list,0,0,1))
{
@ -94,12 +96,12 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t)
if (unit->select_limit_cnt == HA_POS_ERROR)
sl->options&= ~OPTION_FOUND_ROWS;
res=mysql_select(thd, tables, sl->item_list,
sl->where, (ORDER *) sl->order_list.first,
(ORDER*) sl->group_list.first,
sl->having, (ORDER*) NULL,
sl->options | thd->options | SELECT_NO_UNLOCK,
derived_result, unit);
res= mysql_select(thd, tables, sl->item_list,
sl->where, (ORDER *) sl->order_list.first,
(ORDER*) sl->group_list.first,
sl->having, (ORDER*) NULL,
sl->options | thd->options | SELECT_NO_UNLOCK,
derived_result, unit, sl, 0);
if (!res)
{
// Here we entirely fix both TABLE_LIST and list of SELECT's as there were no derived tables
@ -109,6 +111,7 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t)
{
t->real_name=table->real_name;
t->table=table;
table->derived_select_number= sl->select_number;
sl->exclude();
t->derived=(SELECT_LEX *)0; // just in case ...
}

2
sql/sql_insert.cc
View file

@ -1334,6 +1334,7 @@ bool select_insert::send_data(List<Item> &values)
void select_insert::send_error(uint errcode,const char *err)
{
//TODO error should be sent at the query processing end
::send_error(thd,errcode,err);
table->file->extra(HA_EXTRA_NO_CACHE);
table->file->activate_all_index(thd);
@ -1360,6 +1361,7 @@ bool select_insert::send_eof()
if (error)
{
table->file->print_error(error,MYF(0));
//TODO error should be sent at the query processing end
::send_error(thd);
return 1;
}

11
sql/sql_lex.cc
View file

@ -146,8 +146,9 @@ LEX *lex_start(THD *thd, uchar *buf,uint length)
lex->length=0;
lex->select_lex.in_sum_expr=0;
lex->select_lex.expr_list.empty();
lex->select_lex.ftfunc_list.empty();
lex->convert_set=(lex->thd=thd)->variables.convert_set;
lex->select_lex.ftfunc_list_alloc.empty();
lex->select_lex.ftfunc_list= &lex->select->ftfunc_list_alloc;
lex->convert_set= (lex->thd= thd)->variables.convert_set;
lex->yacc_yyss=lex->yacc_yyvs=0;
lex->ignore_space=test(thd->sql_mode & MODE_IGNORE_SPACE);
lex->slave_thd_opt=0;
@ -943,6 +944,8 @@ void st_select_lex_unit::init_query()
global_parameters= this;
select_limit_cnt= HA_POS_ERROR;
offset_limit_cnt= 0;
optimized= 0;
item= 0;
}
void st_select_lex::init_query()
@ -966,9 +969,11 @@ void st_select_lex::init_select()
expr_list.empty();
interval_list.empty();
use_index.empty();
ftfunc_list.empty();
ftfunc_list_alloc.empty();
ftfunc_list= &ftfunc_list_alloc;
linkage= UNSPECIFIED_TYPE;
depended= having_fix_field= 0;
}
/*

34
sql/sql_lex.h
View file

@ -212,7 +212,22 @@ private:
*/
class st_lex;
class st_select_lex;
class THD;
class select_result;
class JOIN;
class select_union;
class st_select_lex_unit: public st_select_lex_node {
protected:
List<Item> item_list;
List<JOIN*> joins; /* list of *JOINs, to delete it in cleanup() */
TABLE_LIST result_table_list;
select_union *union_result;
TABLE *table; /* temporary table using for appending UNION results */
THD *thd;
select_result *result;
int res;
bool describe, found_rows_for_union,
optimized; // optimize phase already performed for UNION (unit)
public:
/*
Pointer to 'last' select or pointer to unit where stored
@ -221,12 +236,21 @@ public:
st_select_lex_node *global_parameters;
/* LIMIT clause runtime counters */
ha_rows select_limit_cnt, offset_limit_cnt;
bool depended; /* depended from outer select subselect */
/* not NULL if union used in subselect, point to subselect item */
Item_subselect *item;
void init_query();
bool create_total_list(THD *thd, st_lex *lex, TABLE_LIST **result);
st_select_lex* outer_select() { return (st_select_lex*) master; }
st_select_lex* first_select() { return (st_select_lex*) slave; }
st_select_lex_unit* next_unit() { return (st_select_lex_unit*) next; }
/* UNION methods */
int prepare(THD *thd, select_result *result);
int exec();
int cleanup();
friend void mysql_init_query(THD *thd);
private:
bool create_total_list_n_last_return(THD *thd, st_lex *lex,
@ -237,7 +261,6 @@ typedef class st_select_lex_unit SELECT_LEX_UNIT;
/*
SELECT_LEX - store information of parsed SELECT_LEX statment
*/
class JOIN;
class st_select_lex: public st_select_lex_node
{
public:
@ -250,9 +273,16 @@ public:
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;
/*
Usualy it is pointer to ftfunc_list_alloc, but in union used to create fake
select_lex for calling mysql_select under results of union
*/
List<Item_func_match> *ftfunc_list;
List<Item_func_match> ftfunc_list_alloc;
JOIN *join; /* after JOIN::prepare it is pointer to corresponding JOIN */
const char *type; /* type of select for EXPLAIN */
uint in_sum_expr;
uint select_number; /* number of select (used for EXPLAIN) */
bool create_refs;
bool braces; /* SELECT ... UNION (SELECT ... ) <- this braces */
bool depended; /* depended from outer select subselect */

123
sql/sql_parse.cc
View file

@ -680,7 +680,7 @@ pthread_handler_decl(handle_one_connection,arg)
if (thd->user_connect)
decrease_user_connections(thd->user_connect);
free_root(&thd->mem_root,MYF(0));
if (net->error && net->vio != 0)
if (net->error && net->vio != 0 && net->report_error)
{
if (!thd->killed && thd->variables.log_warnings)
sql_print_error(ER(ER_NEW_ABORTING_CONNECTION),
@ -1305,6 +1305,7 @@ mysql_execute_command(THD *thd)
*/
thd->old_total_warn_count= thd->total_warn_count;
thd->net.report_error= 0;
if (thd->slave_thread)
{
/*
@ -1327,18 +1328,69 @@ mysql_execute_command(THD *thd)
#endif
}
select_result *explain_result= 0;
/*
Skip if we are in the slave thread, some table rules have been given
and the table list says the query should not be replicated
TODO: make derived tables processing 'inside' SELECT processing.
TODO: solve problem with depended derived tables in subselects
*/
if (lex->derived_tables)
if (lex->sql_command == SQLCOM_SELECT &&
(select_lex->options & SELECT_DESCRIBE) &&
lex->derived_tables)
{
if (!(explain_result= new select_send()))
{
send_error(&thd->net, ER_OUT_OF_RESOURCES);
DBUG_VOID_RETURN;
}
//check rights
for (TABLE_LIST *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 (TABLE_LIST *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;
cursor;
cursor= cursor->next)
if (cursor->derived && mysql_derived(thd, lex,
(SELECT_LEX_UNIT *)cursor->derived,
cursor))
cursor, 0))
DBUG_VOID_RETURN;
}
if ((lex->select_lex.next_select_in_list() &&
@ -1420,8 +1472,46 @@ mysql_execute_command(THD *thd)
if (!(res=open_and_lock_tables(thd,tables)))
{
query_cache_store_query(thd, tables);
res=handle_select(thd, lex, result);
if (select_lex->options & SELECT_DESCRIBE)
{
delete result; // we do not need it for explain
if (!explain_result)
if (!(explain_result= new select_send()))
{
send_error(&thd->net, ER_OUT_OF_RESOURCES);
DBUG_VOID_RETURN;
}
else
thd->send_explain_fields(explain_result);
fix_tables_pointers(select_lex);
for ( SELECT_LEX *sl= select_lex;
sl && res == 0;
sl= sl->next_select_in_list())
{
SELECT_LEX *first= sl->master_unit()->first_select();
res= mysql_explain_select(thd, sl,
((select_lex==sl)?
((sl->next_select_in_list())?"PRIMARY":
"SIMPLE"):
((sl == first)?
((sl->depended)?"DEPENDENT SUBSELECT":
"SUBSELECT"):
((sl->depended)?"DEPENDENT UNION":
"UNION"))),
explain_result);
}
if (res > 0)
res= -res; // mysql_explain_select do not report error
MYSQL_LOCK *save_lock= thd->lock;
thd->lock= (MYSQL_LOCK *)0;
explain_result->send_eof();
thd->lock= save_lock;
}
else
{
query_cache_store_query(thd, tables);
res=handle_select(thd, lex, result);
}
}
else
delete result;
@ -1939,7 +2029,7 @@ mysql_execute_command(THD *thd)
(ORDER *)NULL,
select_lex->options | thd->options |
SELECT_NO_JOIN_CACHE,
result, unit);
result, unit, select_lex, 0);
delete result;
}
else
@ -2100,13 +2190,13 @@ mysql_execute_command(THD *thd)
lex->lock_option,
table_count)))
{
res=mysql_select(thd,tables,select_lex->item_list,
select_lex->where,
(ORDER *)NULL,(ORDER *)NULL,(Item *)NULL,
(ORDER *)NULL,
select_lex->options | thd->options |
SELECT_NO_JOIN_CACHE,
result, unit);
res= mysql_select(thd,tables,select_lex->item_list,
select_lex->where,
(ORDER *)NULL,(ORDER *)NULL,(Item *)NULL,
(ORDER *)NULL,
select_lex->options | thd->options |
SELECT_NO_JOIN_CACHE,
result, unit, select_lex, 0);
delete result;
}
else
@ -2850,6 +2940,7 @@ mysql_init_query(THD *thd)
thd->lex.unit.global_parameters= &thd->lex.select_lex; //Global limit & order
thd->lex.select_lex.master= &thd->lex.unit;
thd->lex.select_lex.prev= &thd->lex.unit.slave;
thd->select_number= thd->lex.select_lex.select_number= 1;
thd->lex.value_list.empty();
thd->free_list= 0;
thd->lex.union_option= 0;
@ -2882,6 +2973,7 @@ bool
mysql_new_select(LEX *lex, bool move_down)
{
SELECT_LEX *select_lex = (SELECT_LEX *) lex->thd->calloc(sizeof(SELECT_LEX));
select_lex->select_number= ++lex->thd->select_number;
if (!select_lex)
return 1;
select_lex->init_query();
@ -2953,6 +3045,7 @@ mysql_parse(THD *thd, char *inBuf, uint length)
mysql_init_query(thd);
thd->query_length = length;
thd->lex.derived_tables= false;
if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
{
LEX *lex=lex_start(thd, (uchar*) inBuf, length);

212
sql/sql_select.cc
View file

@ -144,7 +144,7 @@ static void init_sum_functions(Item_sum **func);
static bool update_sum_func(Item_sum **func);
static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
bool distinct, const char *message=NullS);
static void describe_info(JOIN *join, const char *info);
/*
This handles SELECT with and without UNION
@ -154,40 +154,8 @@ int handle_select(THD *thd, LEX *lex, select_result *result)
{
int res;
register SELECT_LEX *select_lex = &lex->select_lex;
if (select_lex->next_select_in_list())
{
/* Fix tables 'to-be-unioned-from' list to point at opened tables */
for (SELECT_LEX *sl= select_lex;
sl;
sl= sl->next_select_in_list())
{
for (TABLE_LIST *cursor= (TABLE_LIST *)sl->table_list.first;
cursor;
cursor=cursor->next)
cursor->table= ((TABLE_LIST*) cursor->table)->table;
}
}
#ifdef DISABLED_UNTIL_REWRITTEN_IN_4_1
if (lex->olap)
{
SELECT_LEX *sl, *sl_next;
int error;
for (sl= &select_lex; sl; sl=sl_next)
{
sl_next=sl->next; // Save if sl->next changes
if (sl->olap != UNSPECIFIED_OLAP_TYPE)
{
if ((error=handle_olaps(lex,sl)))
return error;
lex->last_selects->next=sl_next;
}
}
lex->select = select_lex;
}
#endif /* DISABLED_UNTIL_REWRITTEN_IN_4_1 */
if (select_lex->next_select())
if (select_lex->next_select())
res=mysql_union(thd,lex,result);
else
res=mysql_select(thd,(TABLE_LIST*) select_lex->table_list.first,
@ -198,13 +166,34 @@ int handle_select(THD *thd, LEX *lex, select_result *result)
select_lex->having,
(ORDER*) lex->proc_list.first,
select_lex->options | thd->options,
result, &(lex->unit));
result, &(lex->unit), &(lex->select_lex), 0);
if (res && result)
result->abort();
if (res || thd->net.report_error)
{
send_error(&thd->net, 0, MYF(0));
res= 1;
}
delete result;
return res;
}
void fix_tables_pointers(SELECT_LEX *select_lex)
{
if (select_lex->next_select_in_list())
{
/* Fix tables 'to-be-unioned-from' list to point at opened tables */
for (SELECT_LEX *sl= select_lex;
sl;
sl= sl->next_select_in_list())
{
for (TABLE_LIST *cursor= (TABLE_LIST *)sl->table_list.first;
cursor;
cursor=cursor->next)
cursor->table= cursor->table_list->table;
}
}
}
/*****************************************************************************
Check fields, find best join, do the select and output fields.
@ -221,10 +210,10 @@ JOIN::prepare(TABLE_LIST *tables_init,
COND *conds_init, ORDER *order_init, ORDER *group_init,
Item *having_init,
ORDER *proc_param_init, SELECT_LEX *select,
SELECT_LEX_UNIT *unit)
SELECT_LEX_UNIT *unit, bool fake_select_lex)
{
DBUG_ENTER("JOIN::prepare");
conds= conds_init;
order= order_init;
group_list= group_init;
@ -232,7 +221,8 @@ JOIN::prepare(TABLE_LIST *tables_init,
proc_param= proc_param_init;
tables_list= tables_init;
select_lex= select;
select_lex->join= this;
if (!fake_select_lex)
select_lex->join= this;
union_part= (unit->first_select()->next_select() != 0);
/* Check that all tables, fields, conds and order are ok */
@ -252,7 +242,7 @@ JOIN::prepare(TABLE_LIST *tables_init,
select_lex->having_fix_field= 1;
bool having_fix_rc= having->fix_fields(thd, tables_list, &having);
select_lex->having_fix_field= 0;
if (having_fix_rc || thd->fatal_error)
if (having_fix_rc || thd->net.report_error)
DBUG_RETURN(-1); /* purecov: inspected */
if (having->with_sum_func)
having->split_sum_func(all_fields);
@ -358,7 +348,7 @@ int
JOIN::optimize()
{
DBUG_ENTER("JOIN::optimize");
#ifdef HAVE_REF_TO_FIELDS // Not done yet
/* Add HAVING to WHERE if possible */
if (having && !group_list && ! sum_func_count)
@ -403,7 +393,8 @@ JOIN::optimize()
}
if (select_options & SELECT_DESCRIBE)
{
describe_info(this, "Select tables optimized away");
select_describe(this, false, false, false,
"Select tables optimized away");
delete procedure;
DBUG_RETURN(1);
}
@ -565,7 +556,7 @@ JOIN::optimize()
make_join_readinfo(this,
(select_options & (SELECT_DESCRIBE |
SELECT_NO_JOIN_CACHE)) |
(thd->lex.select->ftfunc_list.elements ?
(thd->lex.select->ftfunc_list->elements ?
SELECT_NO_JOIN_CACHE : 0));
/*
@ -668,7 +659,7 @@ JOIN::exec()
{ // Only test of functions
error=0;
if (select_options & SELECT_DESCRIBE)
describe_info(this, "No tables used");
select_describe(this, false, false, false, "No tables used");
else
{
result->send_fields(fields_list,1);
@ -677,10 +668,10 @@ JOIN::exec()
if (do_send_rows && result->send_data(fields_list))
{
result->send_error(0,NullS); /* purecov: inspected */
error=1;
error= 1;
}
else
error=(int) result->send_eof();
error= (int) result->send_eof();
}
else
error=(int) result->send_eof();
@ -692,6 +683,7 @@ JOIN::exec()
if (zero_result_cause)
{
error=0;
(void) return_zero_rows(this, result, tables_list, fields_list,
tmp_table_param.sum_func_count != 0 &&
!group_list,
@ -1021,8 +1013,10 @@ JOIN::cleanup(THD *thd)
int
mysql_select(THD *thd, TABLE_LIST *tables, List<Item> &fields, COND *conds,
ORDER *order, ORDER *group,Item *having, ORDER *proc_param,
ulong select_options, select_result *result, SELECT_LEX_UNIT *unit)
ORDER *order, ORDER *group,Item *having, ORDER *proc_param,
ulong select_options, select_result *result,
SELECT_LEX_UNIT *unit, SELECT_LEX *select_lex,
bool fake_select_lex)
{
JOIN *join = new JOIN(thd, fields, select_options, result);
@ -1031,7 +1025,7 @@ mysql_select(THD *thd, TABLE_LIST *tables, List<Item> &fields, COND *conds,
thd->used_tables=0; // Updated by setup_fields
if (join->prepare(tables, conds, order, group, having, proc_param,
&(thd->lex.select_lex), unit))
select_lex, unit, fake_select_lex))
{
DBUG_RETURN(-1);
}
@ -1051,7 +1045,7 @@ err:
thd->limit_found_rows = join->send_records;
thd->examined_row_count = join->examined_rows;
thd->proc_info="end";
int error= join->cleanup(thd);
int error= (fake_select_lex?0:join->cleanup(thd)) || thd->net.report_error;
delete join;
DBUG_RETURN(error);
}
@ -1785,7 +1779,7 @@ update_ref_and_keys(THD *thd, DYNAMIC_ARRAY *keyuse,JOIN_TAB *join_tab,
add_key_part(keyuse,field);
}
if (thd->lex.select->ftfunc_list.elements)
if (thd->lex.select->ftfunc_list->elements)
{
add_ft_keys(keyuse,join_tab,cond,normal_tables);
}
@ -3114,9 +3108,10 @@ return_zero_rows(JOIN *join, select_result *result,TABLE_LIST *tables,
if (select_options & SELECT_DESCRIBE)
{
describe_info(join, info);
select_describe(join, false, false, false, info);
DBUG_RETURN(0);
}
if (procedure)
{
if (result->prepare(fields, unit)) // This hasn't been done yet
@ -3750,6 +3745,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
table->blob_ptr_size=mi_portable_sizeof_char_ptr;
table->map=1;
table->tmp_table= TMP_TABLE;
table->derived_select_number= 0;
table->db_low_byte_first=1; // True for HEAP and MyISAM
table->temp_pool_slot = temp_pool_slot;
@ -4366,7 +4362,7 @@ do_select(JOIN *join,List<Item> *fields,TABLE *table,Procedure *procedure)
VOID(table->file->extra(HA_EXTRA_WRITE_CACHE));
empty_record(table);
}
join->tmp_table=table; /* Save for easy recursion */
join->tmp_table= table; /* Save for easy recursion */
join->fields= fields;
/* Set up select_end */
@ -4416,20 +4412,14 @@ do_select(JOIN *join,List<Item> *fields,TABLE *table,Procedure *procedure)
}
else
{
error=sub_select(join,join_tab,0);
error= sub_select(join,join_tab,0);
if (error >= 0)
error=sub_select(join,join_tab,1);
error= sub_select(join,join_tab,1);
if (error == -3)
error=0; /* select_limit used */
error= 0; /* select_limit used */
}
/* Return 1 if error is sent; -1 if error should be sent */
if (error < 0)
{
join->result->send_error(0,NullS); /* purecov: inspected */
error=1; // Error sent
}
else
if (error >= 0)
{
error=0;
if (!table) // If sending data to client
@ -6497,7 +6487,6 @@ find_order_in_list(THD *thd,TABLE_LIST *tables,ORDER *order,List<Item> &fields,
order->in_field_list=1;
return 0;
}
const char *save_where=thd->where;
Item **item=find_item_in_list(*order->item, fields, 0);
if (item)
{
@ -6596,7 +6585,7 @@ setup_new_fields(THD *thd,TABLE_LIST *tables,List<Item> &fields,
DBUG_ENTER("setup_new_fields");
thd->set_query_id=1; // Not really needed, but...
for (; new_field ; new_field=new_field->next)
for (; new_field ; new_field= new_field->next)
{
if ((item= find_item_in_list(*new_field->item, fields, 0)))
new_field->item=item; /* Change to shared Item */
@ -7190,7 +7179,6 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
Item *item;
List<Item> item_list;
THD *thd=join->thd;
MYSQL_LOCK *save_lock;
SELECT_LEX *select_lex = &(join->thd->lex.select_lex);
select_result *result=join->result;
Item *item_null= new Item_null();
@ -7199,28 +7187,13 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
/* Don't log this into the slow query log */
select_lex->options&= ~(QUERY_NO_INDEX_USED | QUERY_NO_GOOD_INDEX_USED);
join->unit->offset_limit_cnt= 0;
if (thd->lex.select == select_lex)
{
field_list.push_back(new Item_empty_string("table",NAME_LEN));
field_list.push_back(new Item_empty_string("type",10));
field_list.push_back(item=new Item_empty_string("possible_keys",
NAME_LEN*MAX_KEY));
item->maybe_null=1;
field_list.push_back(item=new Item_empty_string("key",NAME_LEN));
item->maybe_null=1;
field_list.push_back(item=new Item_int("key_len",0,3));
item->maybe_null=1;
field_list.push_back(item=new Item_empty_string("ref",
NAME_LEN*MAX_REF_PARTS));
item->maybe_null=1;
field_list.push_back(new Item_real("rows",0.0,0,10));
field_list.push_back(new Item_empty_string("Extra",255));
if (result->send_fields(field_list,1))
return;
}
if (message)
{
item_list.push_back(new Item_int((int)thd->lex.select->select_number));
item_list.push_back(new Item_string(thd->lex.select->type,
strlen(thd->lex.select->type),
default_charset_info));
Item *empty= new Item_empty_string("",0);
for (uint i=0 ; i < 7; i++)
item_list.push_back(empty);
@ -7242,16 +7215,25 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
String tmp2(buff2,sizeof(buff2),default_charset_info);
tmp1.length(0);
tmp2.length(0);
item_list.empty();
item_list.push_back(new Item_int((int)thd->lex.select->select_number));
item_list.push_back(new Item_string(thd->lex.select->type,
strlen(thd->lex.select->type),
default_charset_info));
if (tab->type == JT_ALL && tab->select && tab->select->quick)
tab->type= JT_RANGE;
item_list.push_back(new Item_string(table->table_name,
strlen(table->table_name),
default_charset_info));
item_list.push_back(new Item_string(join_type_str[tab->type],
strlen(join_type_str[tab->type]),
default_charset_info));
if (table->tmp_table == TMP_TABLE && table->derived_select_number != 0)
{
// Derived table name generation
buff[512];
int len= my_snprintf(buff, 512, "<derived%u>",
table->derived_select_number);
item_list.push_back(new Item_string(buff, len, default_charset_info));
}
else
item_list.push_back(new Item_string(table->table_name,
strlen(table->table_name),
default_charset_info));
item_list.push_back(new Item_string(join_type_str[tab->type],strlen(join_type_str[tab->type]),default_charset_info));
key_map bits;
uint j;
for (j=0,bits=tab->keys ; bits ; j++,bits>>=1)
@ -7381,38 +7363,24 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
result->send_error(0,NullS);
}
}
if (!thd->lex.select->next_select())
{
save_lock=thd->lock;
thd->lock=(MYSQL_LOCK *)0;
result->send_eof();
thd->lock=save_lock;
}
DBUG_VOID_RETURN;
}
static void describe_info(JOIN *join, const char *info)
int mysql_explain_select(THD *thd, SELECT_LEX *select_lex, char const *type,
select_result *result)
{
THD *thd= join->thd;
/* If lex.select belong to UNION */
if (thd->lex.select->master_unit()->first_select()->next_select())
{
select_describe(join,FALSE,FALSE,FALSE,info);
return;
}
List<Item> field_list;
String *packet= &thd->packet;
/* Don't log this into the slow query log */
thd->lex.select_lex.options&= ~(QUERY_NO_INDEX_USED |
QUERY_NO_GOOD_INDEX_USED);
field_list.push_back(new Item_empty_string("Comment",80));
if (send_fields(thd,field_list,1))
return; /* purecov: inspected */
packet->length(0);
net_store_data(packet,info);
if (!my_net_write(&thd->net,(char*) packet->ptr(),packet->length()))
send_eof(thd);
select_lex->type= type;
thd->lex.select= select_lex;
SELECT_LEX_UNIT *unit= select_lex->master_unit();
int res= mysql_select(thd,(TABLE_LIST*) select_lex->table_list.first,
select_lex->item_list,
select_lex->where,
(ORDER*) select_lex->order_list.first,
(ORDER*) select_lex->group_list.first,
select_lex->having,
(ORDER*) thd->lex.proc_list.first,
select_lex->options | thd->options | SELECT_DESCRIBE,
result, unit, select_lex, 0);
return res;
}

4
sql/sql_select.h
View file

@ -210,6 +210,7 @@ class JOIN :public Sql_alloc
send_records(0), found_records(0), examined_rows(0),
thd(thd),
sum_funcs(0),
procedure(0),
having(0),
select_options(select_options),
result(result),
@ -237,7 +238,8 @@ class JOIN :public Sql_alloc
int prepare(TABLE_LIST *tables,
COND *conds, ORDER *order, ORDER *group, Item *having,
ORDER *proc_param, SELECT_LEX *select, SELECT_LEX_UNIT *unit);
ORDER *proc_param, SELECT_LEX *select, SELECT_LEX_UNIT *unit,
bool fake_select_lex);
int optimize();
int global_optimize();
int reinit();

378
sql/sql_union.cc
View file

@ -24,160 +24,14 @@
#include "mysql_priv.h"
#include "sql_select.h"
int mysql_union(THD *thd, LEX *lex,select_result *result)
int mysql_union(THD *thd, LEX *lex, select_result *result)
{
SELECT_LEX *sl;
SELECT_LEX_UNIT *unit= &(lex->unit);
List<Item> item_list;
TABLE *table;
int describe=(lex->select_lex.options & SELECT_DESCRIBE) ? 1 : 0;
int res;
bool found_rows_for_union=false;
TABLE_LIST result_table_list;
TMP_TABLE_PARAM tmp_table_param;
select_union *union_result;
DBUG_ENTER("mysql_union");
st_select_lex_node * global;
/* Global option */
if (((void*)(global= unit->global_parameters)) == ((void*)unit))
{
found_rows_for_union= (lex->select_lex.options & OPTION_FOUND_ROWS &&
!describe && global->select_limit);
if (found_rows_for_union)
lex->select_lex.options ^= OPTION_FOUND_ROWS;
}
if (describe)
{
Item *item;
item_list.push_back(new Item_empty_string("table",NAME_LEN));
item_list.push_back(new Item_empty_string("type",10));
item_list.push_back(item=new Item_empty_string("possible_keys",
NAME_LEN*MAX_KEY));
item->maybe_null=1;
item_list.push_back(item=new Item_empty_string("key",NAME_LEN));
item->maybe_null=1;
item_list.push_back(item=new Item_int("key_len",0,3));
item->maybe_null=1;
item_list.push_back(item=new Item_empty_string("ref",
NAME_LEN*MAX_REF_PARTS));
item->maybe_null=1;
item_list.push_back(new Item_real("rows",0.0,0,10));
item_list.push_back(new Item_empty_string("Extra",255));
}
else
{
Item *item;
List_iterator<Item> it(lex->select_lex.item_list);
TABLE_LIST *first_table= (TABLE_LIST*) lex->select_lex.table_list.first;
/* Create a list of items that will be in the result set */
while ((item= it++))
if (item_list.push_back(item))
DBUG_RETURN(-1);
if (setup_fields(thd,first_table,item_list,0,0,1))
DBUG_RETURN(-1);
}
bzero((char*) &tmp_table_param,sizeof(tmp_table_param));
tmp_table_param.field_count=item_list.elements;
if (!(table= create_tmp_table(thd, &tmp_table_param, item_list,
(ORDER*) 0, !describe & !lex->union_option,
1, 0,
(lex->select_lex.options | thd->options |
TMP_TABLE_ALL_COLUMNS),
unit)))
DBUG_RETURN(-1);
table->file->extra(HA_EXTRA_WRITE_CACHE);
table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
bzero((char*) &result_table_list,sizeof(result_table_list));
result_table_list.db= (char*) "";
result_table_list.real_name=result_table_list.alias= (char*) "union";
result_table_list.table=table;
if (!(union_result=new select_union(table)))
{
res= -1;
goto exit;
}
union_result->save_time_stamp=!describe;
union_result->tmp_table_param=&tmp_table_param;
for (sl= &lex->select_lex; sl; sl= sl->next_select())
{
lex->select=sl;
unit->offset_limit_cnt= sl->offset_limit;
unit->select_limit_cnt= sl->select_limit+sl->offset_limit;
if (unit->select_limit_cnt < sl->select_limit)
unit->select_limit_cnt= HA_POS_ERROR; // no limit
if (unit->select_limit_cnt == HA_POS_ERROR)
sl->options&= ~OPTION_FOUND_ROWS;
res= mysql_select(thd,
(TABLE_LIST*) sl->table_list.first,
sl->item_list,
sl->where,
(sl->braces) ?
(ORDER *)sl->order_list.first : (ORDER *) 0,
(ORDER*) sl->group_list.first,
sl->having,
(ORDER*) NULL,
sl->options | thd->options |
SELECT_NO_UNLOCK | ((describe) ? SELECT_DESCRIBE : 0),
union_result, unit);
if (res)
goto exit;
}
if (union_result->flush())
{
res= 1; // Error is already sent
goto exit;
}
delete union_result;
/* Send result to 'result' */
lex->select = &lex->select_lex;
res =-1;
{
/* Create a list of fields in the temporary table */
List_iterator<Item> it(item_list);
Field **field;
#if 0
List<Item_func_match> ftfunc_list;
ftfunc_list.empty();
#else
thd->lex.select_lex.ftfunc_list.empty();
#endif
for (field=table->field ; *field ; field++)
{
(void) it++;
(void) it.replace(new Item_field(*field));
}
if (!thd->fatal_error) // Check if EOM
{
st_select_lex_node * global= unit->global_parameters;
unit->offset_limit_cnt= global->offset_limit;
unit->select_limit_cnt= global->select_limit+global->offset_limit;
if (unit->select_limit_cnt < global->select_limit)
unit->select_limit_cnt= HA_POS_ERROR; // no limit
if (unit->select_limit_cnt == HA_POS_ERROR)
thd->options&= ~OPTION_FOUND_ROWS;
if (describe)
unit->select_limit_cnt= HA_POS_ERROR; // no limit
res= mysql_select(thd,&result_table_list,
item_list, NULL,
(describe) ? 0 : (ORDER*)global->order_list.first,
(ORDER*) NULL, NULL, (ORDER*) NULL,
thd->options, result, unit);
if (found_rows_for_union && !res)
thd->limit_found_rows = (ulonglong)table->file->records;
}
}
exit:
free_tmp_table(thd,table);
SELECT_LEX_UNIT *unit= &lex->unit;
int res= 0;
if (!(res= unit->prepare(thd, result)))
res= unit->exec();
res|= unit->cleanup();
DBUG_RETURN(res);
}
@ -221,7 +75,6 @@ bool select_union::send_data(List<Item> &values)
unit->offset_limit_cnt--;
return 0;
}
fill_record(table->field,values);
if ((write_record(table,&info)))
{
@ -247,3 +100,222 @@ bool select_union::flush()
}
return 0;
}
typedef JOIN * JOIN_P;
int st_select_lex_unit::prepare(THD *thd, select_result *result)
{
describe=(first_select()->options & SELECT_DESCRIBE) ? 1 : 0;
res= 0;
found_rows_for_union= false;
TMP_TABLE_PARAM tmp_table_param;
DBUG_ENTER("st_select_lex_unit::prepare");
this->thd= thd;
this->result= result;
SELECT_LEX *lex_select_save= thd->lex.select;
/* Global option */
if (((void*)(global_parameters)) == ((void*)this))
{
found_rows_for_union= first_select()->options & OPTION_FOUND_ROWS &&
!describe && global_parameters->select_limit;
if (found_rows_for_union)
first_select()->options ^= OPTION_FOUND_ROWS;
}
item_list.empty();
if (describe)
{
Item *item;
item_list.push_back(new Item_empty_string("table",NAME_LEN));
item_list.push_back(new Item_empty_string("type",10));
item_list.push_back(item=new Item_empty_string("possible_keys",
NAME_LEN*MAX_KEY));
item->maybe_null=1;
item_list.push_back(item=new Item_empty_string("key",NAME_LEN));
item->maybe_null=1;
item_list.push_back(item=new Item_int("key_len",0,3));
item->maybe_null=1;
item_list.push_back(item=new Item_empty_string("ref",
NAME_LEN*MAX_REF_PARTS));
item->maybe_null=1;
item_list.push_back(new Item_real("rows",0.0,0,10));
item_list.push_back(new Item_empty_string("Extra",255));
}
else
{
Item *item;
List_iterator<Item> it(first_select()->item_list);
TABLE_LIST *first_table= (TABLE_LIST*) first_select()->table_list.first;
/* Create a list of items that will be in the result set */
while ((item= it++))
if (item_list.push_back(item))
goto err;
if (setup_fields(thd,first_table,item_list,0,0,1))
goto err;
}
bzero((char*) &tmp_table_param,sizeof(tmp_table_param));
tmp_table_param.field_count=item_list.elements;
if (!(table= create_tmp_table(thd, &tmp_table_param, item_list,
(ORDER*) 0, !describe &
!thd->lex.union_option,
1, 0,
(first_select()->options | thd->options |
TMP_TABLE_ALL_COLUMNS),
this)))
goto err;
table->file->extra(HA_EXTRA_WRITE_CACHE);
table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
bzero((char*) &result_table_list,sizeof(result_table_list));
result_table_list.db= (char*) "";
result_table_list.real_name=result_table_list.alias= (char*) "union";
result_table_list.table=table;
if (!(union_result=new select_union(table)))
goto err;
union_result->save_time_stamp=!describe;
union_result->tmp_table_param=&tmp_table_param;
// prepare selects
joins.empty();
for (SELECT_LEX *sl= first_select(); sl; sl= sl->next_select())
{
JOIN *join= new JOIN(thd, sl->item_list,
sl->options | thd->options | SELECT_NO_UNLOCK |
((describe) ? SELECT_DESCRIBE : 0),
union_result);
joins.push_back(new JOIN_P(join));
thd->lex.select=sl;
offset_limit_cnt= sl->offset_limit;
select_limit_cnt= sl->select_limit+sl->offset_limit;
if (select_limit_cnt < sl->select_limit)
select_limit_cnt= HA_POS_ERROR; // no limit
if (select_limit_cnt == HA_POS_ERROR)
sl->options&= ~OPTION_FOUND_ROWS;
res= join->prepare((TABLE_LIST*) sl->table_list.first,
sl->where,
(sl->braces) ?
(ORDER *)sl->order_list.first : (ORDER *) 0,
(ORDER*) sl->group_list.first,
sl->having,
(ORDER*) NULL,
sl, this, 0);
if (res | thd->fatal_error)
goto err;
}
thd->lex.select= lex_select_save;
DBUG_RETURN(res | thd->fatal_error);
err:
thd->lex.select= lex_select_save;
DBUG_RETURN(-1);
}
int st_select_lex_unit::exec()
{
DBUG_ENTER("st_select_lex_unit::exec");
if(depended || !item || !item->assigned())
{
if (optimized && item && item->assigned())
item->assigned(0); // We will reinit & rexecute unit
SELECT_LEX *lex_select_save= thd->lex.select;
for (SELECT_LEX *sl= first_select(); sl; sl= sl->next_select())
{
thd->lex.select=sl;
offset_limit_cnt= sl->offset_limit;
select_limit_cnt= sl->select_limit+sl->offset_limit;
if (select_limit_cnt < sl->select_limit)
select_limit_cnt= HA_POS_ERROR; // no limit
if (select_limit_cnt == HA_POS_ERROR)
sl->options&= ~OPTION_FOUND_ROWS;
if (!optimized)
sl->join->optimize();
else
sl->join->reinit();
sl->join->exec();
res= sl->join->error;
if (res)
{
thd->lex.select= lex_select_save;
DBUG_RETURN(res);
}
}
thd->lex.select= lex_select_save;
optimized= 1;
}
if (union_result->flush())
{
res= 1; // Error is already sent
DBUG_RETURN(res);
}
/* Send result to 'result' */
thd->lex.select = first_select();
res =-1;
{
/* Create a list of fields in the temporary table */
List_iterator<Item> it(item_list);
Field **field;
#if 0
List<Item_func_match> ftfunc_list;
ftfunc_list.empty();
#else
List<Item_func_match> empty_list;
empty_list.empty();
thd->lex.select_lex.ftfunc_list= &empty_list;
#endif
for (field=table->field ; *field ; field++)
{
(void) it++;
(void) it.replace(new Item_field(*field));
}
if (!thd->fatal_error) // Check if EOM
{
offset_limit_cnt= global_parameters->offset_limit;
select_limit_cnt= global_parameters->select_limit+
global_parameters->offset_limit;
if (select_limit_cnt < global_parameters->select_limit)
select_limit_cnt= HA_POS_ERROR; // no limit
if (select_limit_cnt == HA_POS_ERROR)
thd->options&= ~OPTION_FOUND_ROWS;
if (describe)
select_limit_cnt= HA_POS_ERROR; // no limit
res= mysql_select(thd,&result_table_list,
item_list, NULL,
(describe) ?
0:
(ORDER*)global_parameters->order_list.first,
(ORDER*) NULL, NULL, (ORDER*) NULL,
thd->options, result, this, first_select(), 1);
if (found_rows_for_union && !res)
thd->limit_found_rows = (ulonglong)table->file->records;
}
}
thd->lex.select_lex.ftfunc_list= &thd->lex.select_lex.ftfunc_list_alloc;
DBUG_RETURN(res);
}
int st_select_lex_unit::cleanup()
{
DBUG_ENTER("st_select_lex_unit::cleanup");
delete union_result;
free_tmp_table(thd,table);
table= 0; // Safety
List_iterator<JOIN*> j(joins);
JOIN** join;
while ((join= j++))
{
(*join)->cleanup(thd);
delete *join;
delete join;
}
joins.empty();
DBUG_RETURN(0);
}

3
sql/sql_update.cc
View file

@ -661,6 +661,8 @@ bool multi_update::send_data(List<Item> &values)
void multi_update::send_error(uint errcode,const char *err)
{
//TODO error should be sent at the query processing end
/* First send error what ever it is ... */
::send_error(thd,errcode,err);
@ -783,6 +785,7 @@ bool multi_update::send_eof()
if (error == -1)
error = 0;
thd->proc_info="end";
//TODO error should be sent at the query processing end
if (error)
send_error(error,"An error occured in multi-table update");

12
sql/sql_yacc.yy
View file

@ -1807,10 +1807,10 @@ simple_expr:
| singleval_subselect { $$= $1; }
| '{' ident expr '}' { $$= $3; }
| MATCH ident_list_arg AGAINST '(' expr ')'
{ Select->ftfunc_list.push_back((Item_func_match *)
{ Select->ftfunc_list->push_back((Item_func_match *)
($$=new Item_func_match_nl(*$2,$5))); }
| MATCH ident_list_arg AGAINST '(' expr IN_SYM BOOLEAN_SYM MODE_SYM ')'
{ Select->ftfunc_list.push_back((Item_func_match *)
{ Select->ftfunc_list->push_back((Item_func_match *)
($$=new Item_func_match_bool(*$2,$5))); }
| BINARY expr %prec NEG { $$= new Item_func_binary($2); }
| CAST_SYM '(' expr AS cast_type ')' { $$= create_func_cast($3, $5); }
@ -4046,7 +4046,8 @@ singleval_subselect:
singleval_subselect_init:
select_init
{
$$= new Item_singleval_subselect(current_thd, Lex->select);
$$= new Item_singleval_subselect(current_thd,
Lex->select->master_unit()->first_select());
};
exists_subselect:
@ -4059,7 +4060,8 @@ exists_subselect:
exists_subselect_init:
select_init
{
$$= new Item_exists_subselect(current_thd, Lex->select);
$$= new Item_exists_subselect(current_thd,
Lex->select->master_unit()->first_select());
};
subselect_start:
@ -4074,4 +4076,4 @@ subselect_end:
{
LEX *lex=Lex;
lex->select = lex->select->outer_select();
};
}

3
sql/table.h
View file

@ -128,6 +128,9 @@ struct st_table {
uint temp_pool_slot;
/* number of select if it is derived table */
uint derived_select_number;
THD *in_use; /* Which thread uses this */
struct st_table *next,*prev;
};