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

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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"
This commit is contained in:
Alexey Kopytov
2009-12-22 19:23:13 +03:00
parent 5bce1e0642
commit f02525be83
58 changed files with 3526 additions and 1159 deletions
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18
mysql-test/r/func_group.result
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@@ -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);