Backport of WL #2934: Make/find library for doing float/double

                      to string conversions and vice versa" 
Initial import of the dtoa.c code and custom wrappers around it 
to allow its usage from the server code. 
 
Conversion of FLOAT/DOUBLE values to DECIMAL ones or strings 
and vice versa has been significantly reworked. As the new 
algoritms are more precise than the older ones, results of such 
conversions may not always match those obtained from older 
server versions. This in turn may break compatibility for some 
applications. 
 
This patch also fixes the following bugs: 
- bug #12860 "Difference in zero padding of exponent between 
Unix and Windows" 
- bug #21497 "DOUBLE truncated to unusable value" 
- bug #26788 "mysqld (debug) aborts when inserting specific 
numbers into char fields" 
- bug #24541 "Data truncated..." on decimal type columns 
without any good reason" 

1 files changed, 9 insertions, 9 deletions

diff --git a/mysql-test/r/func_group.result b/mysql-test/r/func_group.result
index b36f561578b..6838dcf944c 100644
--- a/mysql-test/r/func_group.result
+++ b/mysql-test/r/func_group.result
@@ -61,7 +61,7 @@ grp	sum
 NULL	NULL
 1	7
 2	20.25
-3	45.4831632475944
+3	45.48316324759439
 create table t2 (grp int, a bigint unsigned, c char(10));
 insert into t2 select grp,max(a)+max(grp),max(c) from t1 group by grp;
 replace into t2 select grp, a, c from t1 limit 2,1;
@@ -891,7 +891,7 @@ select 1e8 * sum(distinct df) from t1;
 330000000
 select 1e8 * min(df) from t1;
 1e8 * min(df)
-110000000
+110000000.00000001
 create table t3 (ifl int);
 insert into t3 values(1), (2);
 select cast(min(ifl) as decimal(5,2)) from t3;
@@ -1186,7 +1186,7 @@ std(s1/s2)
 0.21325764
 select std(o1/o2) from bug22555;
 std(o1/o2)
-0.213257635866493
+0.2132576358664934
 select std(e1/e2) from bug22555;
 std(e1/e2)
 0.21325764
@@ -1209,13 +1209,13 @@ i	count(*)	std(e1/e2)
 3	4	0.000000000000000000000000000000
 select round(std(s1/s2), 17) from bug22555;
 round(std(s1/s2), 17)
-0.21325763586649341
+0.21325763586649340
 select std(o1/o2) from bug22555;
 std(o1/o2)
-0.213257635866493
+0.2132576358664934
 select round(std(e1/e2), 17) from bug22555;
 round(std(e1/e2), 17)
-0.21325763586649341
+0.21325763586649340
 set div_precision_increment=20;
 select i, count(*), std(s1/s2) from bug22555 group by i order by i;
 i	count(*)	std(s1/s2)
@@ -1234,13 +1234,13 @@ i	count(*)	std(e1/e2)
 3	4	0.000000000000000000000000000000
 select round(std(s1/s2), 17) from bug22555;
 round(std(s1/s2), 17)
-0.21325763586649341
+0.21325763586649340
 select std(o1/o2) from bug22555;
 std(o1/o2)
-0.213257635866493
+0.2132576358664934
 select round(std(e1/e2), 17) from bug22555;
 round(std(e1/e2), 17)
-0.21325763586649341
+0.21325763586649340
 set @@div_precision_increment=@saved_div_precision_increment;
 drop table bug22555;
 create table bug22555 (s smallint, o double, e decimal);