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

Reduced the precision of the test numbers.
Not all platforms could reproduce the exact numbers.

mysql-test/r/merge.result

@@ -620,28 +620,28 @@ 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),
+a double(14,4),
 b varchar(10),
 index (a,b)
 ) engine=merge union=(t2,t3);
 create table t2 (
-a double(16,6),
+a double(14,4),
 b varchar(10),
 index (a,b)
 ) engine=myisam;
 create table t3 (
-a double(16,6),
+a double(14,4),
 b varchar(10),
 index (a,b)
 ) engine=myisam;
 insert into t2 values ( null, '');
-insert into t2 values ( 9999999999.999999, '');
+insert into t2 values ( 9999999999.9999, '');
 insert into t3 select * from t2;
 select min(a), max(a) from t1;
 min(a)	max(a)
-9999999999.999998	9999999999.999998
+9999999999.9999	9999999999.9999
 flush tables;
 select min(a), max(a) from t1;
 min(a)	max(a)
-9999999999.999998	9999999999.999998
+9999999999.9999	9999999999.9999
 drop table t1, t2, t3;

mysql-test/t/merge.test

@@ -273,25 +273,25 @@ drop table t1, t2;
 # non-debug build. But there is no guarantee that this will be always so.
 #
 create table t1 (
- a double(16,6),
+ a double(14,4),
  b varchar(10),
  index (a,b)
 ) engine=merge union=(t2,t3);
 
 create table t2 (
- a double(16,6),
+ a double(14,4),
  b varchar(10),
  index (a,b)
 ) engine=myisam;
 
 create table t3 (
- a double(16,6),
+ a double(14,4),
  b varchar(10),
  index (a,b)
 ) engine=myisam;
 
 insert into t2 values ( null, '');
-insert into t2 values ( 9999999999.999999, '');
+insert into t2 values ( 9999999999.9999, '');
 insert into t3 select * from t2;
 select min(a), max(a) from t1;
 flush tables;