In func_group.test, round the results of std() for some calls, because...

In func_group.test, round the results of std() for some calls, because Windows' sqrt() function appears to return fewer "significant" digits than the Unix implementations.
This is for bug #22555.

mysql-test/r/func_group.result

@@ -1216,15 +1216,15 @@ i	count(*)	std(e1/e2)
 1	4	0.000000000000000000000000000000
 2	4	0.000000000000000000000000000000
 3	4	0.000000000000000000000000000000
-select std(s1/s2) from bug22555;
-std(s1/s2)
-0.213257635866493405751853629226
+select round(std(s1/s2), 17) from bug22555;
+round(std(s1/s2), 17)
+0.21325763586649341
 select std(o1/o2) from bug22555;
 std(o1/o2)
 0.21325763586649
-select std(e1/e2) from bug22555;
-std(e1/e2)
-0.213257635866493405751853629226
+select round(std(e1/e2), 17) from bug22555;
+round(std(e1/e2), 17)
+0.21325763586649341
 set div_precision_increment=20;
 select i, count(*), std(s1/s2) from bug22555 group by i order by i;
 i	count(*)	std(s1/s2)
@@ -1241,15 +1241,15 @@ i	count(*)	std(e1/e2)
 1	4	0.000000000000000000000000000000
 2	4	0.000000000000000000000000000000
 3	4	0.000000000000000000000000000000
-select std(s1/s2) from bug22555;
-std(s1/s2)
-0.213257635866493405751853629226
+select round(std(s1/s2), 17) from bug22555;
+round(std(s1/s2), 17)
+0.21325763586649341
 select std(o1/o2) from bug22555;
 std(o1/o2)
 0.21325763586649
-select std(e1/e2) from bug22555;
-std(e1/e2)
-0.213257635866493405751853629226
+select round(std(e1/e2), 17) from bug22555;
+round(std(e1/e2), 17)
+0.21325763586649341
 set @@div_precision_increment=@saved_div_precision_increment;
 drop table bug22555;
 create table bug22555 (s smallint, o double, e decimal);

mysql-test/t/func_group.test

@@ -757,16 +757,16 @@ set div_precision_increment=19;
 select i, count(*), std(s1/s2) from bug22555 group by i order by i;
 select i, count(*), std(o1/o2) from bug22555 group by i order by i;
 select i, count(*), std(e1/e2) from bug22555 group by i order by i;
-select std(s1/s2) from bug22555;
+select round(std(s1/s2), 17) from bug22555;
 select std(o1/o2) from bug22555;
-select std(e1/e2) from bug22555;
+select round(std(e1/e2), 17) from bug22555;
 set div_precision_increment=20;
 select i, count(*), std(s1/s2) from bug22555 group by i order by i;
 select i, count(*), std(o1/o2) from bug22555 group by i order by i;
 select i, count(*), std(e1/e2) from bug22555 group by i order by i;
-select std(s1/s2) from bug22555;
+select round(std(s1/s2), 17) from bug22555;
 select std(o1/o2) from bug22555;
-select std(e1/e2) from bug22555;
+select round(std(e1/e2), 17) from bug22555;
 set @@div_precision_increment=@saved_div_precision_increment;
 drop table bug22555;