ramil/ram@mysql.com/ramil.myoffice.izhnet.ru eb415e4920 fix for bug #19690: ORDER BY eliminates rows from the result ...

Depending on the queries we use different data processing methods
and can lose some data in case of double (and decimal in 4.1) fields.

The fix consists of two parts:
1. double comparison changed, now double a is equal to double b 
if (a-b) is less than 5*0.1^(1 + max(a->decimals, b->decimals)). 
For example, if a->decimals==1, b->decimals==2, a==b if (a-b)<0.005
2. if we use a temporary table, store double values there as is 
to avoid any data conversion (rounding).

2007-01-31 09:51:05 +04:00

179 KiB

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