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Fixed crashing bug with alter table when table was in use (Bug #3643)

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We didn't use 'only index' for tables of type 'const'. (Bug #3497)
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monty@mysql.com
2004-05-05 12:31:17 +03:00
parent 59ddd8c738
commit 7e3cf5958c
11 changed files with 82 additions and 20 deletions
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16
mysql-test/r/key.result
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@@ -206,3 +206,19 @@ select i from t1 where b=repeat(_utf8 'b',310);
i
1
drop table t1;
CREATE TABLE t1 (id int unsigned auto_increment, name char(50), primary key (id)) engine=myisam;
insert into t1 (name) values ('a'), ('b'),('c'),('d'),('e'),('f'),('g');
explain select 1 from t1 where id =2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 const PRIMARY PRIMARY 4 const 1 Using index
explain select 1 from t1 where id =2 or id=3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using where; Using index
explain select name from t1 where id =2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 const PRIMARY PRIMARY 4 const 1
ALTER TABLE t1 DROP PRIMARY KEY, ADD INDEX (id);
explain select 1 from t1 where id =2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref id id 4 const 1 Using where; Using index
drop table t1;