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Commit dbebed97 authored by monty@mashka.mysql.fi's avatar monty@mashka.mysql.fi
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Remove FORCE_INIT_OF_VARS when compiling for valgrind/purify to spot wrong LINT_INIT() options 

Fixed bug in ALTER TABLE ... MODIFY integer-column
Added ref_or_null optimization (needed for subqueries)
parent 01c2c0c3
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Showing with 500 additions and 270 deletions
BUILD/compile-pentium-valgrind-max
View file @ dbebed97
......@@ -3,7 +3,7 @@
path=`dirname $0`
. "$path/SETUP.sh"
extra_flags="$pentium_cflags $debug_cflags -USAFEMALLOC -DHAVE_purify"
extra_flags="$pentium_cflags $debug_cflags -USAFEMALLOC -UFORCE_INIT_OF_VARS -DHAVE_purify"
c_warnings="$c_warnings $debug_extra_warnings"
cxx_warnings="$cxx_warnings $debug_extra_warnings"
extra_configs="$pentium_configs $debug_configs"
......
mysql-test/r/distinct.result
View file @ dbebed97
......@@ -173,9 +173,9 @@ 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;
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 test.t2.a 1 Using where; Distinct
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 2 Using temporary
1 SIMPLE t2 ref a a 4 test.t1.a 2 Using index
1 SIMPLE t3 ref a a 5 test.t1.b 2 Using where; Using index
SELECT distinct t3.a FROM t3,t2,t1 WHERE t3.a=t1.b AND t1.a=t2.a;
a
1
......
mysql-test/r/null_key.result
View file @ dbebed97
......@@ -21,7 +21,10 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,b a 9 NULL 3 Using where; Using index
explain select * from t1 where (a is null or a = 7) and b=7;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b b 4 const 2 Using where
1 SIMPLE t1 ref_or_null a,b a 9 const,const 2 Using where; Using index
explain select * from t1 where (a is null or a = 7) and b=7 order by a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref_or_null a,b a 9 const,const 2 Using where; Using index; Using filesort
explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 Using where; Using index
......@@ -56,13 +59,15 @@ NULL 9
NULL 9
select * from t1 where (a is null or a = 7) and b=7;
a b
NULL 7
7 7
NULL 7
select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
a b
NULL 7
NULL 9
NULL 9
create table t2 like t1;
insert into t2 select * from t1;
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;
id select_type table type possible_keys key key_len ref rows Extra
......@@ -84,7 +89,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,b a 5 NULL 5 Using where
explain select * from t1 where (a is null or a = 7) and b=7 and c=0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL a,b NULL NULL NULL 12 Using where
1 SIMPLE t1 ref_or_null a,b a 5 const 4 Using where
explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 Using where
......@@ -125,8 +130,8 @@ NULL 9 0
NULL 9 0
select * from t1 where (a is null or a = 7) and b=7 and c=0;
a b c
NULL 7 0
7 7 0
NULL 7 0
select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
a b c
NULL 7 0
......@@ -136,6 +141,103 @@ select * from t1 where b like "6%";
a b c
6 6 0
drop table t1;
rename table t2 to t1;
alter table t1 modify b int null;
insert into t1 values (7,null), (8,null), (8,7);
explain select * from t1 where a = 7 and (b=7 or b is null);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref_or_null a,b a 10 const,const 2 Using where; Using index
select * from t1 where a = 7 and (b=7 or b is null);
a b
7 7
7 NULL
explain select * from t1 where (a = 7 or a is null) and (b=7 or b is null);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,b a 10 NULL 4 Using where; Using index
select * from t1 where (a = 7 or a is null) and (b=7 or b is null);
a b
NULL 7
7 NULL
7 7
explain select * from t1 where (a = 7 or a is null) and (a = 7 or a is null);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref_or_null a a 5 const 5 Using where; Using index
select * from t1 where (a = 7 or a is null) and (a = 7 or a is null);
a b
7 NULL
7 7
NULL 7
NULL 9
NULL 9
create table t2 (a int);
insert into t2 values (7),(8);
explain select * from t2 straight_join t1 where t1.a=t2.a and b is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
1 SIMPLE t1 ref a,b a 10 test.t2.a,const 2 Using where; Using index
drop index b on t1;
explain select * from t2,t1 where t1.a=t2.a and b is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
1 SIMPLE t1 ref a a 10 test.t2.a,const 2 Using where; Using index
select * from t2,t1 where t1.a=t2.a and b is null;
a a b
7 7 NULL
8 8 NULL
explain select * from t2,t1 where t1.a=t2.a and (b= 7 or b is null);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
1 SIMPLE t1 ref_or_null a a 10 test.t2.a,const 4 Using where; Using index
select * from t2,t1 where t1.a=t2.a and (b= 7 or b is null);
a a b
7 7 7
7 7 NULL
8 8 7
8 8 NULL
explain select * from t2,t1 where (t1.a=t2.a or t1.a is null) and b= 7;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
1 SIMPLE t1 ref_or_null a a 10 test.t2.a,const 4 Using where; Using index
select * from t2,t1 where (t1.a=t2.a or t1.a is null) and b= 7;
a a b
7 7 7
7 NULL 7
8 8 7
8 NULL 7
explain select * from t2,t1 where (t1.a=t2.a or t1.a is null) and (b= 7 or b is null);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 2
1 SIMPLE t1 ref_or_null a a 5 test.t2.a 4 Using where; Using index
select * from t2,t1 where (t1.a=t2.a or t1.a is null) and (b= 7 or b is null);
a a b
7 7 NULL
7 7 7
7 NULL 7
8 8 NULL
8 8 7
8 NULL 7
insert into t2 values (null),(6);
delete from t1 where a=8;
explain select * from t2,t1 where t1.a=t2.a or t1.a is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 4
1 SIMPLE t1 ref_or_null a a 5 test.t2.a 4 Using where; Using index
explain select * from t2,t1 where t1.a<=>t2.a or (t1.a is null and t1.b <> 9);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 4
1 SIMPLE t1 ref_or_null a a 5 test.t2.a 4 Using where; Using index
select * from t2,t1 where t1.a<=>t2.a or (t1.a is null and t1.b <> 9);
a a b
7 7 NULL
7 7 7
7 NULL 7
8 NULL 7
NULL NULL 7
NULL NULL 9
NULL NULL 9
6 6 6
6 NULL 7
drop table t1,t2;
CREATE TABLE t1 (
id int(10) unsigned NOT NULL auto_increment,
uniq_id int(10) unsigned default NULL,
......
mysql-test/r/subselect.result
View file @ dbebed97
......@@ -827,7 +827,7 @@ a t1.a in (select t2.a from t2)
explain SELECT t1.a, t1.a in (select t2.a from t2) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index NULL PRIMARY 4 NULL 4 Using index
2 DEPENDENT SUBQUERY t2 index a a 5 NULL 3 Using where; Using index
2 DEPENDENT SUBQUERY t2 ref_or_null a a 5 const 2 Using where; Using index
drop table t1,t2;
create table t1 (a float);
select 10.5 IN (SELECT * from t1 LIMIT 1);
......
mysql-test/t/null_key.test
View file @ dbebed97
......@@ -14,6 +14,7 @@ explain select * from t1 where a=2 and b = 2;
explain select * from t1 where a<=>b limit 2;
explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
explain select * from t1 where (a is null or a = 7) and b=7;
explain select * from t1 where (a is null or a = 7) and b=7 order by a;
explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
explain select * from t1 where a > 1 and a < 3 limit 1;
......@@ -25,6 +26,8 @@ select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
select * from t1 where (a is null or a > 0 and a < 3) and b > 7 limit 3;
select * from t1 where (a is null or a = 7) and b=7;
select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
create table t2 like t1;
insert into t2 select * from t1;
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;
explain select * from t1 where a is null and b = 2 and c=0;
......@@ -47,8 +50,38 @@ select * from t1 where (a is null or a > 0 and a < 3) and b > 7 limit 3;
select * from t1 where (a is null or a = 7) and b=7 and c=0;
select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
select * from t1 where b like "6%";
drop table t1;
#
# Test ref_or_null optimization
#
drop table t1;
rename table t2 to t1;
alter table t1 modify b int null;
insert into t1 values (7,null), (8,null), (8,7);
explain select * from t1 where a = 7 and (b=7 or b is null);
select * from t1 where a = 7 and (b=7 or b is null);
explain select * from t1 where (a = 7 or a is null) and (b=7 or b is null);
select * from t1 where (a = 7 or a is null) and (b=7 or b is null);
explain select * from t1 where (a = 7 or a is null) and (a = 7 or a is null);
select * from t1 where (a = 7 or a is null) and (a = 7 or a is null);
create table t2 (a int);
insert into t2 values (7),(8);
explain select * from t2 straight_join t1 where t1.a=t2.a and b is null;
drop index b on t1;
explain select * from t2,t1 where t1.a=t2.a and b is null;
select * from t2,t1 where t1.a=t2.a and b is null;
explain select * from t2,t1 where t1.a=t2.a and (b= 7 or b is null);
select * from t2,t1 where t1.a=t2.a and (b= 7 or b is null);
explain select * from t2,t1 where (t1.a=t2.a or t1.a is null) and b= 7;
select * from t2,t1 where (t1.a=t2.a or t1.a is null) and b= 7;
explain select * from t2,t1 where (t1.a=t2.a or t1.a is null) and (b= 7 or b is null);
select * from t2,t1 where (t1.a=t2.a or t1.a is null) and (b= 7 or b is null);
insert into t2 values (null),(6);
delete from t1 where a=8;
explain select * from t2,t1 where t1.a=t2.a or t1.a is null;
explain select * from t2,t1 where t1.a<=>t2.a or (t1.a is null and t1.b <> 9);
select * from t2,t1 where t1.a<=>t2.a or (t1.a is null and t1.b <> 9);
drop table t1,t2;
#
# The following failed for Matt Loschert
......
sql/sql_select.cc
View file @ dbebed97
......@@ -31,8 +31,11 @@
#include <ft_global.h>
const char *join_type_str[]={ "UNKNOWN","system","const","eq_ref","ref",
"MAYBE_REF","ALL","range","index","fulltext" };
"MAYBE_REF","ALL","range","index","fulltext",
"ref_or_null"
};
static void optimize_keyuse(JOIN *join, DYNAMIC_ARRAY *keyuse_array);
static bool make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
DYNAMIC_ARRAY *keyuse);
static bool update_ref_and_keys(THD *thd, DYNAMIC_ARRAY *keyuse,
......@@ -106,6 +109,8 @@ static int join_read_prev_same(READ_RECORD *info);
static int join_read_prev(READ_RECORD *info);
static int join_ft_read_first(JOIN_TAB *tab);
static int join_ft_read_next(READ_RECORD *info);
static int join_read_always_key_or_null(JOIN_TAB *tab);
static int join_read_next_same_or_null(READ_RECORD *info);
static COND *make_cond_for_table(COND *cond,table_map table,
table_map used_table);
static Item* part_of_refkey(TABLE *form,Field *field);
......@@ -1456,8 +1461,9 @@ make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
DYNAMIC_ARRAY *keyuse_array)
{
int error;
uint i,table_count,const_count,found_ref,refs,key,const_ref,eq_part;
table_map found_const_table_map,all_table_map;
uint i,table_count,const_count,key;
table_map found_const_table_map, all_table_map, found_ref, refs;
key_map const_ref, eq_part;
TABLE **table_vector;
JOIN_TAB *stat,*stat_end,*s,**stat_ref;
KEYUSE *keyuse,*start_keyuse;
......@@ -1475,7 +1481,7 @@ make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
join->best_ref=stat_vector;
stat_end=stat+table_count;
found_const_table_map=all_table_map=0;
found_const_table_map= all_table_map=0;
const_count=0;
for (s=stat,i=0 ; tables ; s++,tables=tables->next,i++)
......@@ -1632,16 +1638,17 @@ make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
key=keyuse->key;
s->keys|= (key_map) 1 << key; // QQ: remove this ?
refs=const_ref=eq_part=0;
refs=const_ref=0;
eq_part=0;
do
{
if (keyuse->val->type() != Item::NULL_ITEM)
if (keyuse->val->type() != Item::NULL_ITEM && !keyuse->optimize)
{
if (!((~found_const_table_map) & keyuse->used_tables))
const_ref|= (key_map) 1 << keyuse->keypart;
else
refs|=keyuse->used_tables;
eq_part|= (uint) 1 << keyuse->keypart;
eq_part|= (key_map) 1 << keyuse->keypart;
}
keyuse++;
} while (keyuse->table == table && keyuse->key == key);
......@@ -1700,8 +1707,6 @@ make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
if (s->worst_seeks < 2.0) // Fix for small tables
s->worst_seeks=2.0;
/* if (s->type == JT_EQ_REF)
continue; */
if (s->const_keys)
{
ha_rows records;
......@@ -1752,7 +1757,10 @@ make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
join->found_const_table_map=found_const_table_map;
if (join->const_tables != join->tables)
{
optimize_keyuse(join, keyuse_array);
find_best_combination(join,all_table_map & ~join->const_table_map);
}
else
{
memcpy((gptr) join->best_positions,(gptr) join->positions,
......@@ -1774,13 +1782,26 @@ make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
typedef struct key_field_t { // Used when finding key fields
Field *field;
Item *val; // May be empty if diff constant
uint level,const_level; // QQ: Remove const_level
uint level;
uint optimize;
bool eq_func;
bool exists_optimize;
} KEY_FIELD;
/* Values in optimize */
#define KEY_OPTIMIZE_EXISTS 1
#define KEY_OPTIMIZE_REF_OR_NULL 2
/*
Merge new key definitions to old ones, remove those not used in both
This is called for OR between different levels
/* merge new key definitions to old ones, remove those not used in both */
To be able to do 'ref_or_null' we merge a comparison of a column
and 'column IS NULL' to one test. This is useful for sub select queries
that are internally transformed to something like:
SELECT * FROM t1 WHERE t1.key=outer_ref_field or t1.key IS NULL
*/
static KEY_FIELD *
merge_key_fields(KEY_FIELD *start,KEY_FIELD *new_fields,KEY_FIELD *end,
......@@ -1802,20 +1823,46 @@ merge_key_fields(KEY_FIELD *start,KEY_FIELD *new_fields,KEY_FIELD *end,
{
if (new_fields->val->used_tables())
{
/*
If the value matches, we can use the key reference.
If not, we keep it until we have examined all new values
*/
if (old->val->eq(new_fields->val, old->field->binary()))
{
old->level=old->const_level=and_level;
old->exists_optimize&=new_fields->exists_optimize;
old->level= and_level;
old->optimize= ((old->optimize & new_fields->optimize &
KEY_OPTIMIZE_EXISTS) |
((old->optimize | new_fields->optimize) &
KEY_OPTIMIZE_REF_OR_NULL));
}
}
else if (old->val->eq(new_fields->val, old->field->binary()) &&
old->eq_func && new_fields->eq_func)
else if (old->eq_func && new_fields->eq_func &&
old->val->eq(new_fields->val, old->field->binary()))
{
old->level= and_level;
old->optimize= ((old->optimize & new_fields->optimize &
KEY_OPTIMIZE_EXISTS) |
((old->optimize | new_fields->optimize) &
KEY_OPTIMIZE_REF_OR_NULL));
}
else if (old->eq_func && new_fields->eq_func &&
(old->val->is_null() || new_fields->val->is_null()))
{
old->level=old->const_level=and_level;
old->exists_optimize&=new_fields->exists_optimize;
/* field = expression OR field IS NULL */
old->level= and_level;
old->optimize= KEY_OPTIMIZE_REF_OR_NULL;
/* Remember the NOT NULL value */
if (old->val->is_null())
old->val= new_fields->val;
}
else // Impossible; remove it
else
{
/*
We are comparing two different const. In this case we can't
use a key-lookup on this so it's better to remove the value
and let the range optimzier handle it
*/
if (old == --first_free) // If last item
break;
*old= *first_free; // Remove old value
......@@ -1827,7 +1874,7 @@ merge_key_fields(KEY_FIELD *start,KEY_FIELD *new_fields,KEY_FIELD *end,
/* Remove all not used items */
for (KEY_FIELD *old=start ; old != first_free ;)
{
if (old->level != and_level && old->const_level != and_level)
if (old->level != and_level)
{ // Not used in all levels
if (old == --first_free)
break;
......@@ -1840,32 +1887,53 @@ merge_key_fields(KEY_FIELD *start,KEY_FIELD *new_fields,KEY_FIELD *end,
}
/*
Add a possible key to array of possible keys if it's usable as a key
SYNPOSIS
add_key_field()
key_fields Pointer to add key, if usable
and_level And level, to be stored in KEY_FIELD
field Field used in comparision
eq_func True if we used =, <=> or IS NULL
value Value used for comparison with field
Is NULL for BETWEEN and IN
usable_tables Tables which can be used for key optimization
NOTES
If we are doing a NOT NULL comparison on a NOT NULL field in a outer join
table, we store this to be able to do not exists optimization later.
RETURN
*key_fields is incremented if we stored a key in the array
*/
static void
add_key_field(KEY_FIELD **key_fields,uint and_level,
Field *field,bool eq_func,Item *value,
table_map usable_tables)
{
bool exists_optimize=0;
uint exists_optimize= 0;
if (!(field->flags & PART_KEY_FLAG))
{
// Don't remove column IS NULL on a LEFT JOIN table
if (!eq_func || !value || value->type() != Item::NULL_ITEM ||
!field->table->maybe_null || field->null_ptr)
return; // Not a key. Skip it
exists_optimize=1;
exists_optimize= KEY_OPTIMIZE_EXISTS;
}
else
{
table_map used_tables=0;
if (value && (used_tables=value->used_tables()) &
(field->table->map | RAND_TABLE_BIT))
if (value && ((used_tables=value->used_tables()) &
(field->table->map | RAND_TABLE_BIT)))
return;
if (!(usable_tables & field->table->map))
{
if (!eq_func || !value || value->type() != Item::NULL_ITEM ||
!field->table->maybe_null || field->null_ptr)
return; // Can't use left join optimize
exists_optimize=1;
exists_optimize= KEY_OPTIMIZE_EXISTS;
}
else
{
......@@ -1880,20 +1948,23 @@ add_key_field(KEY_FIELD **key_fields,uint and_level,
return; // Can't be used as eq key
}
/* Save the following cases:
Field op constant
Field LIKE constant where constant doesn't start with a wildcard
Field = field2 where field2 is in a different table
Field op formula
Field IS NULL
Field IS NOT NULL
/*
Save the following cases:
Field op constant
Field LIKE constant where constant doesn't start with a wildcard
Field = field2 where field2 is in a different table
Field op formula
Field IS NULL
Field IS NOT NULL
*/
stat[0].key_dependent|=used_tables;
if (value->const_item())
stat[0].const_keys |= possible_keys;
/* We can't always use indexes when comparing a string index to a
number. cmp_type() is checked to allow compare of dates to numbers */
/*
We can't always use indexes when comparing a string index to a
number. cmp_type() is checked to allow compare of dates to numbers
*/
if (!eq_func ||
field->result_type() == STRING_RESULT &&
value->result_type() != STRING_RESULT &&
......@@ -1902,11 +1973,11 @@ add_key_field(KEY_FIELD **key_fields,uint and_level,
}
}
/* Store possible eq field */
(*key_fields)->field=field;
(*key_fields)->eq_func=eq_func;
(*key_fields)->val=value;
(*key_fields)->level=(*key_fields)->const_level=and_level;
(*key_fields)->exists_optimize=exists_optimize;
(*key_fields)->field= field;
(*key_fields)->eq_func= eq_func;
(*key_fields)->val= value;
(*key_fields)->level= and_level;
(*key_fields)->optimize= exists_optimize;
(*key_fields)++;
}
......@@ -1926,12 +1997,7 @@ add_key_fields(JOIN_TAB *stat,KEY_FIELD **key_fields,uint *and_level,
while ((item=li++))
add_key_fields(stat,key_fields,and_level,item,usable_tables);
for (; org_key_fields != *key_fields ; org_key_fields++)
{
if (org_key_fields->const_level == org_key_fields->level)
org_key_fields->const_level=org_key_fields->level= *and_level;
else
org_key_fields->const_level= *and_level;
}
org_key_fields->level= *and_level;
}
else
{
......@@ -2024,7 +2090,7 @@ add_key_part(DYNAMIC_ARRAY *keyuse_array,KEY_FIELD *key_field)
TABLE *form= field->table;
KEYUSE keyuse;
if (key_field->eq_func && !key_field->exists_optimize)
if (key_field->eq_func && !(key_field->optimize & KEY_OPTIMIZE_EXISTS))
{
for (uint key=0 ; key < form->keys ; key++)
{
......@@ -2042,7 +2108,9 @@ add_key_part(DYNAMIC_ARRAY *keyuse_array,KEY_FIELD *key_field)
keyuse.val = key_field->val;
keyuse.key = key;
keyuse.keypart=part;
keyuse.keypart_map= (key_part_map) 1 << part;
keyuse.used_tables=key_field->val->used_tables();
keyuse.optimize= key_field->optimize & KEY_OPTIMIZE_REF_OR_NULL;
VOID(insert_dynamic(keyuse_array,(gptr) &keyuse));
}
}
......@@ -2126,16 +2194,23 @@ add_ft_keys(DYNAMIC_ARRAY *keyuse_array,
VOID(insert_dynamic(keyuse_array,(gptr) &keyuse));
}
static int
sort_keyuse(KEYUSE *a,KEYUSE *b)
{
int res;
if (a->table->tablenr != b->table->tablenr)
return (int) (a->table->tablenr - b->table->tablenr);
if (a->key != b->key)
return (int) (a->key - b->key);
if (a->keypart != b->keypart)
return (int) (a->keypart - b->keypart);
return test(a->used_tables) - test(b->used_tables); // Place const first
// Place const values before other ones
if ((res= test(a->used_tables) - test(b->used_tables)))
return res;
/* Place rows that are not 'OPTIMIZE_REF_OR_NULL' first */
return (int) ((a->optimize & KEY_OPTIMIZE_REF_OR_NULL) -
(b->optimize & KEY_OPTIMIZE_REF_OR_NULL));
}
......@@ -2151,30 +2226,27 @@ update_ref_and_keys(THD *thd, DYNAMIC_ARRAY *keyuse,JOIN_TAB *join_tab,
SELECT_LEX *select_lex)
{
uint and_level,i,found_eq_constant;
KEY_FIELD *key_fields,*end;
if (!(key_fields=(KEY_FIELD*)
thd->alloc(sizeof(key_fields[0])*(thd->cond_count+1)*2)))
return TRUE; /* purecov: inspected */
and_level=0; end=key_fields;
if (cond)
add_key_fields(join_tab,&end,&and_level,cond,normal_tables);
for (i=0 ; i < tables ; i++)
{
KEY_FIELD *key_fields,*end;
if (!(key_fields=(KEY_FIELD*)
thd->alloc(sizeof(key_fields[0])*(thd->cond_count+1)*2)))
return TRUE; /* purecov: inspected */
and_level=0; end=key_fields;
if (cond)
add_key_fields(join_tab,&end,&and_level,cond,normal_tables);
for (i=0 ; i < tables ; i++)
if (join_tab[i].on_expr)
{
if (join_tab[i].on_expr)
{
add_key_fields(join_tab,&end,&and_level,join_tab[i].on_expr,
join_tab[i].table->map);
}
add_key_fields(join_tab,&end,&and_level,join_tab[i].on_expr,
join_tab[i].table->map);
}
if (my_init_dynamic_array(keyuse,sizeof(KEYUSE),20,64))
return TRUE;
/* fill keyuse with found key parts */
for (KEY_FIELD *field=key_fields ; field != end ; field++)
add_key_part(keyuse,field);
}
if (my_init_dynamic_array(keyuse,sizeof(KEYUSE),20,64))
return TRUE;
/* fill keyuse with found key parts */
for (KEY_FIELD *field=key_fields ; field != end ; field++)
add_key_part(keyuse,field);
if (select_lex->ftfunc_list->elements)
{
......@@ -2182,9 +2254,10 @@ update_ref_and_keys(THD *thd, DYNAMIC_ARRAY *keyuse,JOIN_TAB *join_tab,
}
/*
Remove ref if there is a keypart which is a ref and a const.
Remove keyparts without previous keyparts.
Special treatment for ft-keys.
Remove the following things from KEYUSE:
- ref if there is a keypart which is a ref and a const.
- keyparts without previous keyparts.
*/
if (keyuse->elements)
{
......@@ -2202,8 +2275,7 @@ update_ref_and_keys(THD *thd, DYNAMIC_ARRAY *keyuse,JOIN_TAB *join_tab,
for (i=0 ; i < keyuse->elements-1 ; i++,use++)
{
if (!use->used_tables)
use->table->const_key_parts[use->key] |=
(key_part_map) 1 << use->keypart;
use->table->const_key_parts[use->key]|= use->keypart_map;
if (use->keypart != FT_KEYPART)
{
if (use->key == prev->key && use->table == prev->table)
......@@ -2232,6 +2304,41 @@ update_ref_and_keys(THD *thd, DYNAMIC_ARRAY *keyuse,JOIN_TAB *join_tab,
return FALSE;
}
/*
Update some values in keyuse for faster find_best_combination() loop
*/
static void optimize_keyuse(JOIN *join, DYNAMIC_ARRAY *keyuse_array)
{
KEYUSE *end,*keyuse= dynamic_element(keyuse_array, 0, KEYUSE*);
for (end= keyuse+ keyuse_array->elements ; keyuse < end ; keyuse++)
{
table_map map;
/*
If we find a ref, assume this table matches a proportional
part of this table.
For example 100 records matching a table with 5000 records
gives 5000/100 = 50 records per key
Constant tables are ignored.
To avoid bad matches, we don't make ref_table_rows less than 100.
*/
keyuse->ref_table_rows= ~(table_map) 0; // If no ref
if (keyuse->used_tables &
(map= (keyuse->used_tables & ~join->const_table_map &
~OUTER_REF_TABLE_BIT)))
{
uint tablenr;
for (tablenr=0 ; ! (map & 1) ; map>>=1, tablenr++) ;
if (map == 1) // Only one table
{
TABLE *tmp_table=join->all_tables[tablenr];
keyuse->ref_table_rows= max(tmp_table->file->records, 100);
}
}
}
}
/*****************************************************************************
Go through all combinations of not marked tables and find the one
......@@ -2318,7 +2425,7 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
uint max_key_part=0;
/* Test how we can use keys */
rec= s->records/MATCHING_ROWS_IN_OTHER_TABLE; /* Assumed records/key */
rec= s->records/MATCHING_ROWS_IN_OTHER_TABLE; // Assumed records/key
for (keyuse=s->keyuse ; keyuse->table == table ;)
{
key_map found_part=0;
......@@ -2326,44 +2433,27 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
uint key=keyuse->key;
KEY *keyinfo=table->key_info+key;
bool ft_key=(keyuse->keypart == FT_KEYPART);
uint found_ref_or_null= 0;
/* Calculate how many key segments of the current key we can use */
start_key=keyuse;
do
{
uint keypart=keyuse->keypart;
uint found_part_ref_or_null= KEY_OPTIMIZE_REF_OR_NULL;
do
{
if (!ft_key)
{
table_map map;
if (!(rest_tables & keyuse->used_tables))
{
found_part|= (key_part_map) 1 << keypart;
found_ref|= keyuse->used_tables;
}
/*
If we find a ref, assume this table matches a proportional
part of this table.
For example 100 records matching a table with 5000 records
gives 5000/100 = 50 records per key
Constant tables are ignored and to avoid bad matches,
we don't make rec less than 100.
*/
if (keyuse->used_tables &
(map=(keyuse->used_tables & ~join->const_table_map &
~OUTER_REF_TABLE_BIT)))
{
uint tablenr;
for (tablenr=0 ; ! (map & 1) ; map>>=1, tablenr++) ;
if (map == 1) // Only one table
{
TABLE *tmp_table=join->all_tables[tablenr];
if (rec > tmp_table->file->records && rec > 100)
rec=max(tmp_table->file->records,100);
}
}
if (!(rest_tables & keyuse->used_tables) &&
!(found_ref_or_null & keyuse->optimize))
{
found_part|=keyuse->keypart_map;
found_ref|= keyuse->used_tables;
if (rec > keyuse->ref_table_rows)
rec= keyuse->ref_table_rows;
found_part_ref_or_null&= keyuse->optimize;
}
keyuse++;
found_ref_or_null|= found_part_ref_or_null;
} while (keyuse->table == table && keyuse->key == key &&
keyuse->keypart == keypart);
} while (keyuse->table == table && keyuse->key == key);
......@@ -2373,8 +2463,8 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
*/
if (!found_part && !ft_key)
continue; // Nothing usable found
if (rec == 0)
rec=1L; // Fix for small tables
if (rec < MATCHING_ROWS_IN_OTHER_TABLE)
rec= MATCHING_ROWS_IN_OTHER_TABLE; // Fix for small tables
/*
ft-keys require special treatment
......@@ -2393,7 +2483,8 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
/*
Check if we found full key
*/
if (found_part == PREV_BITS(uint,keyinfo->key_parts))
if (found_part == PREV_BITS(uint,keyinfo->key_parts) &&
!found_ref_or_null)
{ /* use eq key */
max_key_part= (uint) ~0;
if ((keyinfo->flags & (HA_NOSAME | HA_NULL_PART_KEY)) == HA_NOSAME)
......@@ -2446,7 +2537,8 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
Set tmp to (previous record count) * (records / combination)
*/
if ((found_part & 1) &&
!(table->file->index_flags(key) & HA_ONLY_WHOLE_INDEX))
(!(table->file->index_flags(key) & HA_ONLY_WHOLE_INDEX) ||
found_part == PREV_BITS(uint,keyinfo->key_parts)))
{
max_key_part=max_part_bit(found_part);
/*
......@@ -2496,6 +2588,12 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
}
records=(ulong) tmp;
}
if (found_ref_or_null)
{
/* We need to do two key searches to find key */
tmp*= 2.0;
records*= 2.0;
}
}
if (table->used_keys & ((key_map) 1 << key))
{
......@@ -2745,9 +2843,7 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
TABLE *table;
KEY *keyinfo;
/*
Use best key from find_best
*/
/* Use best key from find_best */
table=j->table;
key=keyuse->key;
keyinfo=table->key_info+key;
......@@ -2763,14 +2859,22 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
else
{
keyparts=length=0;
uint found_part_ref_or_null= 0;
/*
Calculate length for the used key
Stop if there is a missing key part or when we find second key_part
with KEY_OPTIMIZE_REF_OR_NULL
*/
do
{
if (!((~used_tables) & keyuse->used_tables))
if (!(~used_tables & keyuse->used_tables))
{
if (keyparts == keyuse->keypart)
if (keyparts == keyuse->keypart &&
!(found_part_ref_or_null & keyuse->optimize))
{
keyparts++;
length+=keyinfo->key_part[keyuse->keypart].store_length;
length+= keyinfo->key_part[keyuse->keypart].store_length;
found_part_ref_or_null|= keyuse->optimize;
}
}
keyuse++;
......@@ -2793,8 +2897,8 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
j->ref.key_err=1;
keyuse=org_keyuse;
store_key **ref_key=j->ref.key_copy;
byte *key_buff=j->ref.key_buff;
store_key **ref_key= j->ref.key_copy;
byte *key_buff=j->ref.key_buff, *null_ref_key= 0;
if (ftkey)
{
j->ref.items[0]=((Item_func*)(keyuse->val))->key_item();
......@@ -2822,9 +2926,7 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
maybe_null ? (char*) key_buff : 0,
keyinfo->key_part[i].length, keyuse->val);
if (thd->is_fatal_error)
{
return TRUE;
}
tmp.copy();
}
else
......@@ -2832,17 +2934,25 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
keyuse,join->const_table_map,
&keyinfo->key_part[i],
(char*) key_buff,maybe_null);
/* Remmeber if we are going to use REF_OR_NULL */
if (keyuse->optimize & KEY_OPTIMIZE_REF_OR_NULL)
null_ref_key= key_buff;
key_buff+=keyinfo->key_part[i].store_length;
}
} /* not ftkey */
*ref_key=0; // end_marker
if (j->type == JT_FT) /* no-op */;
else if (j->type == JT_CONST)
j->table->const_table=1;
if (j->type == JT_FT)
return 0;
if (j->type == JT_CONST)
j->table->const_table= 1;
else if (((keyinfo->flags & (HA_NOSAME | HA_NULL_PART_KEY))
!= HA_NOSAME) ||
keyparts != keyinfo->key_parts)
j->type=JT_REF; /* Must read with repeat */
!= HA_NOSAME) || keyparts != keyinfo->key_parts ||
null_ref_key)
{
/* Must read with repeat */
j->type= null_ref_key ? JT_REF_OR_NULL : JT_REF;
j->null_ref_key= null_ref_key;
}
else if (ref_key == j->ref.key_copy)
{
/*
......@@ -3153,6 +3263,7 @@ make_join_readinfo(JOIN *join, uint options)
table->file->extra(HA_EXTRA_KEYREAD);
}
break;
case JT_REF_OR_NULL:
case JT_REF:
table->status=STATUS_NO_RECORD;
if (tab->select)
......@@ -3163,14 +3274,22 @@ make_join_readinfo(JOIN *join, uint options)
delete tab->quick;
tab->quick=0;
table->file->index_init(tab->ref.key);
tab->read_first_record= join_read_always_key;
tab->read_record.read_record= join_read_next_same;
if (table->used_keys & ((key_map) 1 << tab->ref.key) &&
!table->no_keyread)
{
table->key_read=1;
table->file->extra(HA_EXTRA_KEYREAD);
}
if (tab->type == JT_REF)
{
tab->read_first_record= join_read_always_key;
tab->read_record.read_record= join_read_next_same;
}
else
{
tab->read_first_record= join_read_always_key_or_null;
tab->read_record.read_record= join_read_next_same_or_null;
}
break;
case JT_FT:
table->status=STATUS_NO_RECORD;
......@@ -5181,6 +5300,40 @@ flush_cached_records(JOIN *join,JOIN_TAB *join_tab,bool skipp_last)
The different ways to read a record
Returns -1 if row was not found, 0 if row was found and 1 on errors
*****************************************************************************/
/* Help function when we get some an error from the table handler */
static int report_error(TABLE *table, int error)
{
if (error == HA_ERR_END_OF_FILE || error == HA_ERR_KEY_NOT_FOUND)
{
table->status= STATUS_GARBAGE;
return -1; // key not found; ok
}
/*
Locking reads can legally return also these errors, do not
print them to the .err log
*/
if (error != HA_ERR_LOCK_DEADLOCK && error != HA_ERR_LOCK_WAIT_TIMEOUT)
sql_print_error("Got error %d when reading table '%s'",
error, table->path);
table->file->print_error(error,MYF(0));
return 1;
}
static int safe_index_read(JOIN_TAB *tab)
{
int error;
TABLE *table= tab->table;
if ((error=table->file->index_read(table->record[0],
tab->ref.key_buff,
tab->ref.key_length, HA_READ_KEY_EXACT)))
return report_error(table, error);
return 0;
}
static int
join_read_const_table(JOIN_TAB *tab, POSITION *pos)
{
......@@ -5235,10 +5388,7 @@ join_read_system(JOIN_TAB *tab)
table->primary_key)))
{
if (error != HA_ERR_END_OF_FILE)
{
table->file->print_error(error,MYF(0));
return 1;
}
return report_error(table, error);
table->null_row=1; // This is ok.
empty_record(table); // Make empty record
return -1;
......@@ -5272,15 +5422,7 @@ join_read_const(JOIN_TAB *tab)
table->null_row=1;
empty_record(table);
if (error != HA_ERR_KEY_NOT_FOUND)
{
/* Locking reads can legally return also these errors, do not
print them to the .err log */
if (error != HA_ERR_LOCK_DEADLOCK && error != HA_ERR_LOCK_WAIT_TIMEOUT)
sql_print_error("read_const: Got error %d when reading table %s",
error, table->path);
table->file->print_error(error,MYF(0));
return 1;
}
return report_error(table, error);
return -1;
}
store_record(table,record[1]);
......@@ -5313,12 +5455,7 @@ join_read_key(JOIN_TAB *tab)
tab->ref.key_buff,
tab->ref.key_length,HA_READ_KEY_EXACT);
if (error && error != HA_ERR_KEY_NOT_FOUND)
{
sql_print_error("read_key: Got error %d when reading table '%s'",error,
table->path);
table->file->print_error(error,MYF(0));
return 1;
}
return report_error(table, error);
}
table->null_row=0;
return table->status ? -1 : 0;
......@@ -5338,18 +5475,13 @@ join_read_always_key(JOIN_TAB *tab)
tab->ref.key_length,HA_READ_KEY_EXACT)))
{
if (error != HA_ERR_KEY_NOT_FOUND)
{
if (error != HA_ERR_LOCK_DEADLOCK && error != HA_ERR_LOCK_WAIT_TIMEOUT)
sql_print_error("read_const: Got error %d when reading table %s",error,
table->path);
table->file->print_error(error,MYF(0));
return 1;
}
return report_error(table, error);
return -1; /* purecov: inspected */
}
return 0;
}
/*
This function is used when optimizing away ORDER BY in
SELECT * FROM t1 WHERE a=1 ORDER BY a DESC,b DESC
......@@ -5368,13 +5500,7 @@ join_read_last_key(JOIN_TAB *tab)
tab->ref.key_length)))
{
if (error != HA_ERR_KEY_NOT_FOUND)
{
if (error != HA_ERR_LOCK_DEADLOCK && error != HA_ERR_LOCK_WAIT_TIMEOUT)
sql_print_error("read_const: Got error %d when reading table %s",error,
table->path);
table->file->print_error(error,MYF(0));
return 1;
}
return report_error(table, error);
return -1; /* purecov: inspected */
}
return 0;
......@@ -5401,19 +5527,14 @@ join_read_next_same(READ_RECORD *info)
tab->ref.key_length)))
{
if (error != HA_ERR_END_OF_FILE)
{
if (error != HA_ERR_LOCK_DEADLOCK && error != HA_ERR_LOCK_WAIT_TIMEOUT)
sql_print_error("read_next: Got error %d when reading table %s",error,
table->path);
table->file->print_error(error,MYF(0));
return 1;
}
return report_error(table, error);
table->status= STATUS_GARBAGE;
return -1;
}
return 0;
}
static int
join_read_prev_same(READ_RECORD *info)
{
......@@ -5422,23 +5543,9 @@ join_read_prev_same(READ_RECORD *info)
JOIN_TAB *tab=table->reginfo.join_tab;
if ((error=table->file->index_prev(table->record[0])))
{
if (error != HA_ERR_END_OF_FILE)
{
if (error != HA_ERR_LOCK_DEADLOCK && error != HA_ERR_LOCK_WAIT_TIMEOUT)
sql_print_error("read_next: Got error %d when reading table %s",error,
table->path);
table->file->print_error(error,MYF(0));
error= 1;
}
else
{
table->status= STATUS_GARBAGE;
error= -1;
}
}
else if (key_cmp(table, tab->ref.key_buff, tab->ref.key,
tab->ref.key_length))
return report_error(table, error);
if (key_cmp(table, tab->ref.key_buff, tab->ref.key,
tab->ref.key_length))
{
table->status=STATUS_NOT_FOUND;
error= -1;
......@@ -5475,6 +5582,7 @@ join_init_read_record(JOIN_TAB *tab)
return (*tab->read_record.read_record)(&tab->read_record);
}
static int
join_read_first(JOIN_TAB *tab)
{
......@@ -5492,17 +5600,10 @@ join_read_first(JOIN_TAB *tab)
tab->read_record.file=table->file;
tab->read_record.index=tab->index;
tab->read_record.record=table->record[0];
error=tab->table->file->index_first(tab->table->record[0]);
if (error)
if ((error=tab->table->file->index_first(tab->table->record[0])))
{
if (error != HA_ERR_KEY_NOT_FOUND && error != HA_ERR_END_OF_FILE)
{
if (error != HA_ERR_LOCK_DEADLOCK && error != HA_ERR_LOCK_WAIT_TIMEOUT)
sql_print_error("read_first_with_key: Got error %d when reading table",
error);
table->file->print_error(error,MYF(0));
return 1;
}
report_error(table, error);
return -1;
}
return 0;
......@@ -5512,23 +5613,13 @@ join_read_first(JOIN_TAB *tab)
static int
join_read_next(READ_RECORD *info)
{
int error=info->file->index_next(info->record);
if (error)
{
if (error != HA_ERR_END_OF_FILE)
{
if (error != HA_ERR_LOCK_DEADLOCK && error != HA_ERR_LOCK_WAIT_TIMEOUT)
sql_print_error(
"read_next_with_key: Got error %d when reading table %s",
error, info->table->path);
info->file->print_error(error,MYF(0));
return 1;
}
return -1;
}
int error;
if ((error=info->file->index_next(info->record)))
return report_error(info->table, error);
return 0;
}
static int
join_read_last(JOIN_TAB *tab)
{
......@@ -5546,19 +5637,8 @@ join_read_last(JOIN_TAB *tab)
tab->read_record.file=table->file;
tab->read_record.index=tab->index;
tab->read_record.record=table->record[0];
error=tab->table->file->index_last(tab->table->record[0]);
if (error)
{
if (error != HA_ERR_END_OF_FILE)
{
if (error != HA_ERR_LOCK_DEADLOCK && error != HA_ERR_LOCK_WAIT_TIMEOUT)
sql_print_error("read_last_with_key: Got error %d when reading table",
error, table->path);
table->file->print_error(error,MYF(0));
return 1;
}
return -1;
}
if ((error= tab->table->file->index_last(tab->table->record[0])))
return report_error(table, error);
return 0;
}
......@@ -5566,20 +5646,9 @@ join_read_last(JOIN_TAB *tab)
static int
join_read_prev(READ_RECORD *info)
{
int error=info->file->index_prev(info->record);
if (error)
{
if (error != HA_ERR_END_OF_FILE)
{
if (error != HA_ERR_LOCK_DEADLOCK && error != HA_ERR_LOCK_WAIT_TIMEOUT)
sql_print_error(
"read_prev_with_key: Got error %d when reading table: %s",
error,info->table->path);
info->file->print_error(error,MYF(0));
return 1;
}
return -1;
}
int error;
if ((error= info->file->index_prev(info->record)))
return report_error(info->table, error);
return 0;
}
......@@ -5596,42 +5665,57 @@ join_ft_read_first(JOIN_TAB *tab)
#endif
table->file->ft_init();
error=table->file->ft_read(table->record[0]);
if (error)
{
if (error != HA_ERR_END_OF_FILE)
{
if (error != HA_ERR_LOCK_DEADLOCK && error != HA_ERR_LOCK_WAIT_TIMEOUT)
sql_print_error("ft_read_first: Got error %d when reading table %s",
error, table->path);
table->file->print_error(error,MYF(0));
return 1;
}
return -1;
}
if ((error= table->file->ft_read(table->record[0])))
return report_error(table, error);
return 0;
}
static int
join_ft_read_next(READ_RECORD *info)
{
int error=info->file->ft_read(info->table->record[0]);
if (error)
{
if (error != HA_ERR_END_OF_FILE)
{
if (error != HA_ERR_LOCK_DEADLOCK && error != HA_ERR_LOCK_WAIT_TIMEOUT)
sql_print_error("ft_read_next: Got error %d when reading table %s",
error, info->table->path);
info->file->print_error(error,MYF(0));
return 1;
}
return -1;
}
int error;
if ((error= info->file->ft_read(info->table->record[0])))
return report_error(info->table, error);
return 0;
}
/*
Reading of key with key reference and one part that may be NULL
*/
static int
join_read_always_key_or_null(JOIN_TAB *tab)
{
int res;
/* First read according to key which is NOT NULL */
*tab->null_ref_key=0;
if ((res= join_read_always_key(tab)) >= 0)
return res;
/* Then read key with null value */
*tab->null_ref_key= 1;
return safe_index_read(tab);
}
static int
join_read_next_same_or_null(READ_RECORD *info)
{
int error;
if ((error= join_read_next_same(info)) >= 0)
return error;
JOIN_TAB *tab= info->table->reginfo.join_tab;
/* Test if we have already done a read after null key */
if (*tab->null_ref_key)
return -1; // All keys read
*tab->null_ref_key= 1; // Read null key
return safe_index_read(tab);
}
/*****************************************************************************
The different end of select functions
These functions returns < 0 when end is reached, 0 on ok and > 0 if a
......@@ -6358,10 +6442,13 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
}
ref_key= -1;
if (tab->ref.key >= 0) // Constant range in WHERE
/* Test if constant range in WHERE */
if (tab->ref.key >= 0)
{
ref_key= tab->ref.key;
ref_key_parts= tab->ref.key_parts;
if (tab->type == JT_REF_OR_NULL)
DBUG_RETURN(0);
}
else if (select && select->quick) // Range found by opt_range
{
......
sql/sql_select.h
View file @ dbebed97
......@@ -27,8 +27,10 @@
typedef struct keyuse_t {
TABLE *table;
Item *val; /* or value if no field */
uint key,keypart;
table_map used_tables;
uint key, keypart, optimize;
key_map keypart_map;
ha_rows ref_table_rows;
} KEYUSE;
class store_key;
......@@ -73,7 +75,7 @@ typedef struct st_join_cache {
*/
enum join_type { JT_UNKNOWN,JT_SYSTEM,JT_CONST,JT_EQ_REF,JT_REF,JT_MAYBE_REF,
JT_ALL, JT_RANGE, JT_NEXT, JT_FT};
JT_ALL, JT_RANGE, JT_NEXT, JT_FT, JT_REF_OR_NULL};
class JOIN;
......@@ -85,6 +87,7 @@ typedef struct st_join_table {
QUICK_SELECT *quick;
Item *on_expr;
const char *info;
byte *null_ref_key;
int (*read_first_record)(struct st_join_table *tab);
int (*next_select)(JOIN *,struct st_join_table *,bool);
READ_RECORD read_record;
......
sql/sql_yacc.yy
View file @ dbebed97
......@@ -1597,6 +1597,7 @@ alter_list_item:
LEX *lex=Lex;
lex->length=lex->dec=0; lex->type=0; lex->interval=0;
lex->default_value=lex->comment=0;
lex->charset= NULL;
lex->simple_alter=0;
}
type opt_attribute
......
sql/table.cc
View file @ dbebed97
......@@ -395,7 +395,9 @@ int openfrm(const char *name, const char *alias, uint db_stat, uint prgflag,
}
else
{
if (!(charset=get_charset((uint) strpos[14], MYF(0))))
if (!strpos[14])
charset= &my_charset_bin;
else if (!(charset=get_charset((uint) strpos[14], MYF(0))))
charset= (outparam->table_charset ? outparam->table_charset:
default_charset_info);
}
......
sql/unireg.cc
View file @ dbebed97
......@@ -460,8 +460,10 @@ static bool pack_fields(File file,List<create_field> &create_fields)
buff[13]= (uchar) field->sql_type;
if (field->sql_type == FIELD_TYPE_GEOMETRY)
buff[14]= (uchar) field->geom_type;
else
else if (field->charset)
buff[14]= (uchar) field->charset->number;
else
buff[14]= 0; // Numerical
int2store(buff+15, field->comment.length);
comment_length+= field->comment.length;
set_if_bigger(int_count,field->interval_id);
......
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