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Amend the previous cset:

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Make EXPLAIN better at displaying MRR/BKA:
- Update all .result files
- Extra comments
This commit is contained in:
Sergey Petrunya
2011-04-04 12:32:52 +04:00
parent 997445bc8e
commit d4ce827226
6 changed files with 31 additions and 15 deletions
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2
mysql-test/suite/innodb/r/innodb.result
View File

@ -1219,7 +1219,7 @@ count(*)
623
explain select * from t1 where c between 1 and 2500;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range c c 5 NULL # Using index condition; Using MRR
1 SIMPLE t1 range c c 5 NULL # Using index condition; Rowid-ordered scan
update t1 set c=a;
explain select * from t1 where c between 1 and 2500;
id select_type table type possible_keys key key_len ref rows Extra

4
mysql-test/suite/maria/r/maria.result
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@ -389,10 +389,10 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a a 4 test.t2.a 3
explain select * from t1 where a=0 or a=2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 4 NULL 4 Using index condition; Using MRR
1 SIMPLE t1 range a a 4 NULL 4 Using index condition; Rowid-ordered scan
explain select * from t1 force index (a) where a=0 or a=2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 4 NULL 4 Using index condition; Using MRR
1 SIMPLE t1 range a a 4 NULL 4 Using index condition; Rowid-ordered scan
explain select * from t1 where c=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref c,c_2 c 5 const 1

2
mysql-test/suite/vcol/r/vcol_misc.result
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@ -144,7 +144,7 @@ explain
select * from t1,t2 where t1.b=t2.c and d <= 100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
1 SIMPLE t2 ref idx idx 5 test.t1.b 2 Using where; Using join buffer (flat, BKA join)
1 SIMPLE t2 ref idx idx 5 test.t1.b 2 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
select * from t1,t2 where t1.b=t2.c and d <= 100;
a b c d v
4 20 20 100 101

8
mysql-test/suite/vcol/r/vcol_select_innodb.result
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@ -44,7 +44,7 @@ a b c
1 -1 -1
explain select * from t3 where c>=-1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Using MRR
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Rowid-ordered scan
# select_type=SIMPLE, type=ref
select * from t1,t3 where t1.c=t3.c and t3.c=-1;
a b c a b c
@ -141,7 +141,7 @@ a b c
2 -2 -2
explain select * from t3 where c >= -2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Using MRR
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Rowid-ordered scan
# SELECT * FROM tbl_name WHERE <non-vcol expr>
select * from t3 where a between 1 and 2;
a b c
@ -165,7 +165,7 @@ a b c
2 -2 -2
explain select * from t3 where c between -2 and -1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Using MRR
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Rowid-ordered scan
# SELECT * FROM tbl_name WHERE <non-vcol expr> ORDER BY <non-indexed vcol>
select * from t3 where a between 1 and 2 order by b;
a b c
@ -205,7 +205,7 @@ a b c
1 -1 -1
explain select * from t3 where c between -2 and -1 order by b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Using MRR; Using filesort
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Rowid-ordered scan; Using filesort
# SELECT * FROM tbl_name WHERE <non-indexed vcol expr> ORDER BY <indexed vcol>
select * from t3 where b between -2 and -1 order by c;
a b c

14
mysql-test/suite/vcol/r/vcol_select_myisam.result
View File

@ -44,7 +44,7 @@ a b c
1 -1 -1
explain select * from t3 where c>=-1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range c c 5 NULL 2 Using index condition; Using MRR
1 SIMPLE t3 range c c 5 NULL 2 Using index condition; Rowid-ordered scan
# select_type=SIMPLE, type=ref
select * from t1,t3 where t1.c=t3.c and t3.c=-1;
a b c a b c
@ -141,7 +141,7 @@ a b c
1 -1 -1
explain select * from t3 where c >= -2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range c c 5 NULL 2 Using index condition; Using MRR
1 SIMPLE t3 range c c 5 NULL 2 Using index condition; Rowid-ordered scan
# SELECT * FROM tbl_name WHERE <non-vcol expr>
select * from t3 where a between 1 and 2;
a b c
@ -149,7 +149,7 @@ a b c
1 -1 -1
explain select * from t3 where a between 1 and 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Using MRR
1 SIMPLE t3 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Rowid-ordered scan
# SELECT * FROM tbl_name WHERE <non-indexed vcol expr>
select * from t3 where b between -2 and -1;
a b c
@ -165,7 +165,7 @@ a b c
1 -1 -1
explain select * from t3 where c between -2 and -1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Using MRR
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Rowid-ordered scan
# SELECT * FROM tbl_name WHERE <non-vcol expr> ORDER BY <indexed vcol>
select * from t3 where a between 1 and 2 order by c;
a b c
@ -173,7 +173,7 @@ a b c
1 -1 -1
explain select * from t3 where a between 1 and 2 order by c;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Using where; Using MRR; Using filesort
1 SIMPLE t3 range PRIMARY PRIMARY 4 NULL 1 Using index condition; Using where; Rowid-ordered scan; Using filesort
# SELECT * FROM tbl_name WHERE <non-indexed vcol expr> ORDER BY <non-vcol>
select * from t3 where b between -2 and -1 order by a;
a b c
@ -189,7 +189,7 @@ a b c
2 -2 -2
explain select * from t3 where c between -2 and -1 order by a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Using where; Using MRR; Using filesort
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Using where; Rowid-ordered scan; Using filesort
# SELECT * FROM tbl_name WHERE <non-indexed vcol expr> ORDER BY <non-indexed vcol>
select * from t3 where b between -2 and -1 order by b;
a b c
@ -205,7 +205,7 @@ a b c
1 -1 -1
explain select * from t3 where c between -2 and -1 order by b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Using MRR; Using filesort
1 SIMPLE t3 range c c 5 NULL 1 Using index condition; Rowid-ordered scan; Using filesort
# SELECT * FROM tbl_name WHERE <non-indexed vcol expr> ORDER BY <indexed vcol>
select * from t3 where b between -2 and -1 order by c;
a b c

16
sql/handler.h
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@ -1358,6 +1358,22 @@ void get_sweep_read_cost(TABLE *table, ha_rows nrows, bool interrupted,
*/
#define HA_MRR_MATERIALIZED_KEYS 256
/*
The following bits are reserved for use by MRR implementation. The intended
use scenario:
* sql layer calls handler->multi_range_read_info[_const]()
- MRR implementation figures out what kind of scan it will perform, saves
the result in *mrr_mode parameter.
* sql layer remembers what was returned in *mrr_mode
* the optimizer picks the query plan (which may or may not include the MRR
scan that was estimated by the multi_range_read_info[_const] call)
* if the query is an EXPLAIN statement, sql layer will call
handler->multi_range_read_explain_info(mrr_mode) to get a text description
of the picked MRR scan; the description will be a part of EXPLAIN output.
*/
#define HA_MRR_IMPLEMENTATION_FLAG1 512
#define HA_MRR_IMPLEMENTATION_FLAG2 1024
#define HA_MRR_IMPLEMENTATION_FLAG3 2048