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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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14
mysql-test/r/select.result
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@ -2784,26 +2784,26 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
select max(key1) from t1 where key1 <= 0.6158;
max(key1)
0.615800023078918
0.6158000230789185
select max(key2) from t2 where key2 <= 1.6158;
max(key2)
1.61580002307892
1.6158000230789185
select min(key1) from t1 where key1 >= 0.3762;
min(key1)
0.376199990510941
0.37619999051094055
select min(key2) from t2 where key2 >= 1.3762;
min(key2)
1.37619996070862
1.3761999607086182
select max(key1), min(key2) from t1, t2
where key1 <= 0.6158 and key2 >= 1.3762;
max(key1) min(key2)
0.615800023078918 1.37619996070862
0.6158000230789185 1.3761999607086182
select max(key1) from t1 where key1 <= 0.6158 and rand() + 0.5 >= 0.5;
max(key1)
0.615800023078918
0.6158000230789185
select min(key1) from t1 where key1 >= 0.3762 and rand() + 0.5 >= 0.5;
min(key1)
0.376199990510941
0.37619999051094055
DROP TABLE t1,t2;
CREATE TABLE t1 (i BIGINT UNSIGNED NOT NULL);
INSERT INTO t1 VALUES (10);