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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
sql/sql_string.cc
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@ -125,7 +125,7 @@ bool String::set(double num,uint decimals, CHARSET_INFO *cs)
str_charset=cs;
if (decimals >= NOT_FIXED_DEC)
{
uint32 len= my_sprintf(buff,(buff, "%.14g",num));// Enough for a DATETIME
uint32 len= my_sprintf(buff,(buff, "%.15g",num));// Enough for a DATETIME
return copy(buff, len, &my_charset_latin1, cs, &dummy_errors);
}
#ifdef HAVE_FCONVERT
@ -677,7 +677,7 @@ void String::qs_append(const char *str, uint32 len)
void String::qs_append(double d)
{
char *buff = Ptr + str_length;
str_length+= my_sprintf(buff, (buff, "%.14g", d));
str_length+= my_sprintf(buff, (buff, "%.15g", d));
}
void String::qs_append(double *d)