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func_group.result:

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Added new tests for better coverage of
  min/max optimization code.
func_group.test:
  Added new tests for better coverage of 
  min/max optimization code.
opt_sum.cc:
  Fixed wrong previous manual merge.
  Fixed bugs concerning fields used in min/max
  functions for which there are conditions of
  the form field=const.


sql/opt_sum.cc:
  Fixed wrong previous manual merge.
  Fixed bugs concerning fields used in min/max
  functions for which there are conditions of
  the form field=const.
mysql-test/t/func_group.test:
  Added new test for better coverage of 
  min/max optimization code.
mysql-test/r/func_group.result:
  Added new tests for better coverage of
  min/max optimization code.
This commit is contained in:
unknown 2003-02-28 08:53:54 +02:00
parent c00be6a648
commit b5c467786e
3 changed files with 198 additions and 35 deletions
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120
mysql-test/r/func_group.result
View File

@ -389,12 +389,12 @@ select max(a3) from t1 where a3 < 'SEA' and a2 = 2 and a3 <= 'MIN';
max(a3) max(a3)
MIN MIN
explain explain
select max(a3) from t1 where a3 = 'SEA' and a2 = 2; select max(a3) from t1 where a3 = 'MIN' and a2 = 2;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
select max(a3) from t1 where a3 = 'SEA' and a2 = 2; select max(a3) from t1 where a3 = 'MIN' and a2 = 2;
max(a3) max(a3)
SEA MIN
explain explain
select max(a3) from t1 where a3 = 'DEN' and a2 = 2; select max(a3) from t1 where a3 = 'DEN' and a2 = 2;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
@ -431,6 +431,83 @@ select min(a3) from t1 where a2 = 2 and a3 < 'SEA';
min(a3) min(a3)
CHI CHI
explain explain
select min(a3) from t1 where a2 = 4;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No matching min/max row
select min(a3) from t1 where a2 = 4;
min(a3)
NULL
explain
select min(a3) from t1 where a2 = 2 and a3 > 'SEA';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No matching min/max row
select min(a3) from t1 where a2 = 2 and a3 > 'SEA';
min(a3)
NULL
explain
select (min(a4)+max(a4))/2 from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
select (min(a4)+max(a4))/2 from t1;
(min(a4)+max(a4))/2
0.085
explain
select min(a3) from t1 where 2 = a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
select min(a3) from t1 where 2 = a2;
min(a3)
CHI
explain
select max(a3) from t1 where a2 = 2 and 'SEA' > a3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
select max(a3) from t1 where a2 = 2 and 'SEA' > a3;
max(a3)
MIN
explain
select max(a3) from t1 where a2 = 2 and 'SEA' < a3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No matching min/max row
select max(a3) from t1 where a2 = 2 and 'SEA' < a3;
max(a3)
NULL
explain
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI';
min(a3)
CHI
explain
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 < 'SEA';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 < 'SEA';
min(a3)
CHI
explain
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 = 'MIN';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 = 'MIN';
min(a3)
MIN
explain
select min(a3) from t1 where a2 = 2 and a3 >= 'SEA' and a3 = 'MIN';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
select min(a3) from t1 where a2 = 2 and a3 >= 'SEA' and a3 = 'MIN';
min(a3)
NULL
explain
select min(t1.a1), min(t2.a4) from t1,t2 where t1.a1 < 'KKK' and t2.a4 < 'KKK';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
select min(t1.a1), min(t2.a4) from t1,t2 where t1.a1 < 'KKK' and t2.a4 < 'KKK';
min(t1.a1) min(t2.a4)
AME AME
explain
select min(a1) from t1 where a1 > 'KKK' or a1 < 'XXX'; select min(a1) from t1 where a1 > 'KKK' or a1 < 'XXX';
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 0 NULL 15 Using where; Using index 1 SIMPLE t1 range PRIMARY PRIMARY 0 NULL 15 Using where; Using index
@ -447,4 +524,41 @@ select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range k1 k1 7 NULL 1 Using where; Using index 1 SIMPLE t1 range k1 k1 7 NULL 1 Using where; Using index
1 SIMPLE t2 range k1 k1 3 NULL 4 Using where; Using index 1 SIMPLE t2 range k1 k1 3 NULL 4 Using where; Using index
explain
select min(a4 - 0.01) from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL k2 12 NULL 14 Using index
explain
select max(a4 + 0.01) from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL k2 12 NULL 14 Using index
explain
select min(a3) from t1 where (a2 +1 ) is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL k1 7 NULL 14 Using where; Using index
explain
select min(a3) from t1 where (a2 + 1) = 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL k1 7 NULL 14 Using where; Using index
explain
select min(a3) from t1 where 2 = (a2 + 1);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL k1 7 NULL 14 Using where; Using index
explain
select min(a2) from t1 where a2 < 2 * a2 - 8;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL k1 7 NULL 14 Using where; Using index
explain
select min(a1) from t1 where a1 between a3 and 'KKK';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 14 Using where
explain
select min(a4) from t1 where (a4 + 0.01) between 0.07 and 0.08;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL k2 12 NULL 14 Using where; Using index
explain
select concat(min(t1.a1),min(t2.a4)) from t1, t2 where t2.a4 <> 'AME';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 3 NULL 14 Using index
1 SIMPLE t2 index NULL k2 4 NULL 6 Using where; Using index
drop table if exists t1, t2; drop table if exists t1, t2;

57
mysql-test/t/func_group.test
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@ -241,8 +241,8 @@ explain
select max(a3) from t1 where a3 < 'SEA' and a2 = 2 and a3 <= 'MIN'; select max(a3) from t1 where a3 < 'SEA' and a2 = 2 and a3 <= 'MIN';
select max(a3) from t1 where a3 < 'SEA' and a2 = 2 and a3 <= 'MIN'; select max(a3) from t1 where a3 < 'SEA' and a2 = 2 and a3 <= 'MIN';
explain explain
select max(a3) from t1 where a3 = 'SEA' and a2 = 2; select max(a3) from t1 where a3 = 'MIN' and a2 = 2;
select max(a3) from t1 where a3 = 'SEA' and a2 = 2; select max(a3) from t1 where a3 = 'MIN' and a2 = 2;
explain explain
select max(a3) from t1 where a3 = 'DEN' and a2 = 2; select max(a3) from t1 where a3 = 'DEN' and a2 = 2;
select max(a3) from t1 where a3 = 'DEN' and a2 = 2; select max(a3) from t1 where a3 = 'DEN' and a2 = 2;
@ -262,6 +262,41 @@ explain
select min(a3) from t1 where a2 = 2 and a3 < 'SEA'; select min(a3) from t1 where a2 = 2 and a3 < 'SEA';
select min(a3) from t1 where a2 = 2 and a3 < 'SEA'; select min(a3) from t1 where a2 = 2 and a3 < 'SEA';
explain
select min(a3) from t1 where a2 = 4;
select min(a3) from t1 where a2 = 4;
explain
select min(a3) from t1 where a2 = 2 and a3 > 'SEA';
select min(a3) from t1 where a2 = 2 and a3 > 'SEA';
explain
select (min(a4)+max(a4))/2 from t1;
select (min(a4)+max(a4))/2 from t1;
explain
select min(a3) from t1 where 2 = a2;
select min(a3) from t1 where 2 = a2;
explain
select max(a3) from t1 where a2 = 2 and 'SEA' > a3;
select max(a3) from t1 where a2 = 2 and 'SEA' > a3;
explain
select max(a3) from t1 where a2 = 2 and 'SEA' < a3;
select max(a3) from t1 where a2 = 2 and 'SEA' < a3;
explain
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI';
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI';
explain
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 < 'SEA';
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 < 'SEA';
explain
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 = 'MIN';
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 = 'MIN';
explain
select min(a3) from t1 where a2 = 2 and a3 >= 'SEA' and a3 = 'MIN';
select min(a3) from t1 where a2 = 2 and a3 >= 'SEA' and a3 = 'MIN';
explain
select min(t1.a1), min(t2.a4) from t1,t2 where t1.a1 < 'KKK' and t2.a4 < 'KKK';
select min(t1.a1), min(t2.a4) from t1,t2 where t1.a1 < 'KKK' and t2.a4 < 'KKK';
# Queries to which max/min optimization is not applied # Queries to which max/min optimization is not applied
explain explain
@ -273,6 +308,24 @@ select max(a3) from t1 where a2 < 2 and a3 < 'SEA';
explain explain
select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 > 'CA'; select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 > 'CA';
explain
select min(a4 - 0.01) from t1;
explain
select max(a4 + 0.01) from t1;
explain
select min(a3) from t1 where (a2 +1 ) is null;
explain
select min(a3) from t1 where (a2 + 1) = 2;
explain
select min(a3) from t1 where 2 = (a2 + 1);
explain
select min(a2) from t1 where a2 < 2 * a2 - 8;
explain
select min(a1) from t1 where a1 between a3 and 'KKK';
explain
select min(a4) from t1 where (a4 + 0.01) between 0.07 and 0.08;
explain
select concat(min(t1.a1),min(t2.a4)) from t1, t2 where t2.a4 <> 'AME';
# Clean up # Clean up
drop table if exists t1, t2; drop table if exists t1, t2;

56
sql/opt_sum.cc
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@ -168,7 +168,9 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
Look for a partial key that can be used for optimization. Look for a partial key that can be used for optimization.
If we succeed, ref.key_length will contain the length of If we succeed, ref.key_length will contain the length of
this key, while prefix_len will contain the length of this key, while prefix_len will contain the length of
the beginning of this key without field used in MIN() the beginning of this key without field used in MIN().
Type of range for the key part for this field will be
returned in range_fl.
*/ */
if ((outer_tables & table->map) || if ((outer_tables & table->map) ||
!find_key_for_maxmin(0, &ref, item_field->field, conds, !find_key_for_maxmin(0, &ref, item_field->field, conds,
@ -178,24 +180,15 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
break; break;
} }
bool error= table->file->index_init((uint) ref.key); bool error= table->file->index_init((uint) ref.key);
enum ha_rkey_function find_flag= range_fl & NEAR_MIN ?
HA_READ_AFTER_KEY : HA_READ_KEY_OR_NEXT;
/*
If we are doing MIN() on a column with NULL fields
we must read the key after the NULL column
*/
if (item_field->field->null_bit)
{
ref.key_buff[ref.key_length++]= 1;
find_flag= HA_READ_AFTER_KEY;
}
if (!ref.key_length) if (!ref.key_length)
error= table->file->index_first(table->record[0]) != 0; error= table->file->index_first(table->record[0]) != 0;
else else
error= table->file->index_read(table->record[0], key_buff, error= table->file->index_read(table->record[0],key_buff,
ref.key_length, ref.key_length,
find_flag) || range_fl & NEAR_MIN ?
HA_READ_AFTER_KEY :
HA_READ_KEY_OR_NEXT) ||
reckey_in_range(0, &ref, item_field->field, reckey_in_range(0, &ref, item_field->field,
conds, range_fl, prefix_len); conds, range_fl, prefix_len);
if (table->key_read) if (table->key_read)
@ -240,7 +233,9 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
Look for a partial key that can be used for optimization. Look for a partial key that can be used for optimization.
If we succeed, ref.key_length will contain the length of If we succeed, ref.key_length will contain the length of
this key, while prefix_len will contain the length of this key, while prefix_len will contain the length of
the beginning of this key without field used in MAX() the beginning of this key without field used in MAX().
Type of range for the key part for this field will be
returned in range_fl.
*/ */
if ((outer_tables & table->map) || if ((outer_tables & table->map) ||
!find_key_for_maxmin(1, &ref, item_field->field, conds, !find_key_for_maxmin(1, &ref, item_field->field, conds,
@ -520,12 +515,13 @@ static bool matching_cond(bool max_fl, TABLE_REF *ref, KEY *keyinfo,
if (org_key_part_used != *key_part_used || if (org_key_part_used != *key_part_used ||
(is_field_part && (is_field_part &&
(between || max_fl == less_fl) && !cond->val_int())) (between || eq_type || max_fl == less_fl) && !cond->val_int()))
{ {
/* /*
It's the first predicate for this part or a predicate of the It's the first predicate for this part or a predicate of the
following form that moves upper/lower bounds for max/min values: following form that moves upper/lower bounds for max/min values:
- field BETWEEN const AND const - field BETWEEN const AND const
- field = const
- field {<|<=} const, when searching for MAX - field {<|<=} const, when searching for MAX
- field {>|>=} const, when searching for MIN - field {>|>=} const, when searching for MIN
*/ */
@ -545,7 +541,7 @@ static bool matching_cond(bool max_fl, TABLE_REF *ref, KEY *keyinfo,
} }
if (is_field_part) if (is_field_part)
{ {
if (between) if (between || eq_type)
*range_fl&= ~(NO_MAX_RANGE | NO_MIN_RANGE); *range_fl&= ~(NO_MAX_RANGE | NO_MIN_RANGE);
else else
{ {
@ -578,7 +574,7 @@ static bool matching_cond(bool max_fl, TABLE_REF *ref, KEY *keyinfo,
ref in/out Reference to the structure we store the key value ref in/out Reference to the structure we store the key value
field in: Field used inside MIN() / MAX() field in: Field used inside MIN() / MAX()
cond in: WHERE condition cond in: WHERE condition
range_fl in/out Bit flags for how to search if key is ok range_fl out: Bit flags for how to search if key is ok
prefix_len out: Length of prefix for the search range prefix_len out: Length of prefix for the search range
DESCRIPTION DESCRIPTION
@ -739,17 +735,17 @@ static int maxmin_in_range(bool max_fl, Field* field, COND *cond)
case Item_func::GT_FUNC: case Item_func::GT_FUNC:
case Item_func::GE_FUNC: case Item_func::GE_FUNC:
{ {
Item *item= ((Item_func*) cond)->arguments()[1]; Item *item= ((Item_func*) cond)->arguments()[1];
/* In case of 'const op item' we have to swap the operator */ /* In case of 'const op item' we have to swap the operator */
if (!item->const_item()) if (!item->const_item())
less_fl= 1-less_fl; less_fl= 1-less_fl;
/* /*
We only have to check the expression if we are using an expression like We only have to check the expression if we are using an expression like
SELECT MAX(b) FROM t1 WHERE a=const AND b>const SELECT MAX(b) FROM t1 WHERE a=const AND b>const
not for not for
SELECT MAX(b) FROM t1 WHERE a=const AND b<const SELECT MAX(b) FROM t1 WHERE a=const AND b<const
*/ */
if (max_fl != less_fl) if (max_fl != less_fl)
return cond->val_int() == 0; // Return 1 if WHERE is false return cond->val_int() == 0; // Return 1 if WHERE is false
return 0; return 0;
} }