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Bug#9112 - Merge table with composite index producing invalid results with some queries

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The problem was an ab-use of last_rkey_length.
Formerly we saved the packed key length (of the search key)
in this element. But in certain cases it got replaced by 
the (packed) result key length.
Now we use a new element of MI_INFO to save the packed key 
length of the search key.
This commit is contained in:
ingo@mysql.com
2005-09-23 10:15:11 +02:00
parent a8bdf632d3
commit 4025d2965b
7 changed files with 92 additions and 12 deletions
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26
mysql-test/r/merge.result
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@@ -619,3 +619,29 @@ INSERT TABLE 't1' isn't allowed in FROM table list
create table t3 engine=merge union=(t1, t2) select * from t2;
INSERT TABLE 't2' isn't allowed in FROM table list
drop table t1, t2;
create table t1 (
a double(16,6),
b varchar(10),
index (a,b)
) engine=merge union=(t2,t3);
create table t2 (
a double(16,6),
b varchar(10),
index (a,b)
) engine=myisam;
create table t3 (
a double(16,6),
b varchar(10),
index (a,b)
) engine=myisam;
insert into t2 values ( null, '');
insert into t2 values ( 9999999999.999999, '');
insert into t3 select * from t2;
select min(a), max(a) from t1;
min(a) max(a)
9999999999.999998 9999999999.999998
flush tables;
select min(a), max(a) from t1;
min(a) max(a)
9999999999.999998 9999999999.999998
drop table t1, t2, t3;