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BTREE-indexes in HEAP tables can now be used to optimize ORDER BY

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Don't read character set files if we are using only the default charset. In most cases the user will not anymore get a warning about missing character set files
Compare strings with space extend instead of space strip. Now the following comparisons holds:  "a" == "a " and "a\t" < "a". (Bug #3152).
Note: Because of the above fix, one has to do a REPAIR on any table that has an ascii character < 32 last in a CHAR/VARCHAR/TEXT columns.
This commit is contained in:
monty@mysql.com
2004-03-25 15:05:01 +02:00
parent 042af556d5
commit ebc3b3afac
35 changed files with 1095 additions and 462 deletions
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17
mysql-test/r/heap_btree.result
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@@ -173,9 +173,22 @@ f1 f2
drop table t1;
create table t1 (btn char(10) not null, key using BTREE (btn)) engine=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%";
explain select * from t1 where btn like "i%";
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL btn NULL NULL NULL 14 Using where
1 SIMPLE t1 range btn btn 10 NULL 1 Using where
explain select * from t1 where btn like "h%";
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range btn btn 10 NULL 4 Using where
explain select * from t1 where btn like "a%";
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range btn btn 10 NULL 1 Using where
explain select * from t1 where btn like "b%";
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range btn btn 10 NULL 1 Using where
select * from t1 where btn like "ff%";
btn
select * from t1 where btn like " %";
btn
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;