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Fix for bug #21205: Different number of digits for float/double/real in --ps-protocol

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Various parts of code used different 'precision' arguments for sprintf("%g") when converting
floating point numbers to a string. This led to differences in results in some cases 
depending on whether the text-based or prepared statements protocol is used for a query.

Fixed by changing arguments to sprintf("%g") to always be 15 (DBL_DIG) so that results are
consistent regardless of the protocol.

This patch will be null-merged to 6.0 as the problem does not exists there (fixed by the
patch for WL#2934).
This commit is contained in:
Alexey Kopytov
2009-01-28 20:59:08 +03:00
parent 2048bd7117
commit 30ac49019d
13 changed files with 58 additions and 45 deletions
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4
mysql-test/r/func_str.result
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@@ -1131,10 +1131,10 @@ cast(rtrim(ltrim(' 20.06 ')) as decimal(19,2))
20.06
select conv("18383815659218730760",10,10) + 0;
conv("18383815659218730760",10,10) + 0
1.8383815659219e+19
1.83838156592187e+19
select "18383815659218730760" + 0;
"18383815659218730760" + 0
1.8383815659219e+19
1.83838156592187e+19
CREATE TABLE t1 (code varchar(10));
INSERT INTO t1 VALUES ('a12'), ('A12'), ('a13');
SELECT ASCII(code), code FROM t1 WHERE code='A12';