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BUG#14940 "MySQL choose wrong index", v.2

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- Make the range-et-al optimizer produce E(#table records after table 
                                           condition is applied),
- Make the join optimizer use this value,
- Add "filtered" column to EXPLAIN EXTENDED to show 
  fraction of records left after table condition is applied
- Adjust test results, add comments
This commit is contained in:
sergefp@mysql.com
2006-07-28 21:27:01 +04:00
parent 1459784aba
commit 699291a8e6
75 changed files with 942 additions and 683 deletions
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24
mysql-test/r/func_test.result
View File

@@ -45,8 +45,8 @@ select 3 ^ 11, 1 ^ 1, 1 ^ 0, 1 ^ NULL, NULL ^ 1;
3 ^ 11 1 ^ 1 1 ^ 0 1 ^ NULL NULL ^ 1
8 0 1 NULL NULL
explain extended select 3 ^ 11, 1 ^ 1, 1 ^ 0, 1 ^ NULL, NULL ^ 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select (3 ^ 11) AS `3 ^ 11`,(1 ^ 1) AS `1 ^ 1`,(1 ^ 0) AS `1 ^ 0`,(1 ^ NULL) AS `1 ^ NULL`,(NULL ^ 1) AS `NULL ^ 1`
select 1 XOR 1, 1 XOR 0, 0 XOR 1, 0 XOR 0, NULL XOR 1, 1 XOR NULL, 0 XOR NULL;
@@ -59,16 +59,16 @@ select 10 % 7, 10 mod 7, 10 div 3;
10 % 7 10 mod 7 10 div 3
3 3 3
explain extended select 10 % 7, 10 mod 7, 10 div 3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select (10 % 7) AS `10 % 7`,(10 % 7) AS `10 mod 7`,(10 DIV 3) AS `10 div 3`
select (1 << 64)-1, ((1 << 64)-1) DIV 1, ((1 << 64)-1) DIV 2;
(1 << 64)-1 ((1 << 64)-1) DIV 1 ((1 << 64)-1) DIV 2
18446744073709551615 18446744073709551615 9223372036854775807
explain extended select (1 << 64)-1, ((1 << 64)-1) DIV 1, ((1 << 64)-1) DIV 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select ((1 << 64) - 1) AS `(1 << 64)-1`,(((1 << 64) - 1) DIV 1) AS `((1 << 64)-1) DIV 1`,(((1 << 64) - 1) DIV 2) AS `((1 << 64)-1) DIV 2`
create table t1 (a int);
@@ -76,16 +76,16 @@ insert t1 values (1);
select * from t1 where 1 xor 1;
a
explain extended select * from t1 where 1 xor 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1`
select - a from t1;
- a
-1
explain extended select - a from t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 system NULL NULL NULL NULL 1
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00
Warnings:
Note 1003 select -(`test`.`t1`.`a`) AS `- a` from `test`.`t1`
drop table t1;
@@ -105,8 +105,8 @@ select _koi8r'a' = _koi8r'A' COLLATE koi8r_general_ci;
_koi8r'a' = _koi8r'A' COLLATE koi8r_general_ci
1
explain extended select _koi8r'a' = _koi8r'A' COLLATE koi8r_general_ci;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select (_koi8r'a' = (_koi8r'A' collate koi8r_general_ci)) AS `_koi8r'a' = _koi8r'A' COLLATE koi8r_general_ci`
select _koi8r'a' = _koi8r'A' COLLATE koi8r_bin;