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Bug #45261 : Crash, stored procedure + decimal

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Bug #48370  Absolutely wrong calculations with GROUP BY and
  decimal fields when using IF

Added the test cases in the above two bugs for regression
testing.
Added additional tests that demonstrate a incomplete fix.
Added a new factory method for Field_new_decimal to 
create a field from an (decimal returning) Item.
In the new method made sure that all the precision and 
length variables are capped in a proper way. 
This is required because Item's can have larger precision
than the decimal fields and thus need to be capped when
creating a field based on an Item type.
Fixed the wrong typecast to Item_decimal.
This commit is contained in:
Georgi Kodinov 2009-11-20 12:10:47 +02:00
commit a21cd97c35
8 changed files with 560 additions and 85 deletions
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39
sql/item_func.cc
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@ -451,45 +451,8 @@ Field *Item_func::tmp_table_field(TABLE *table)
return make_string_field(table);
break;
case DECIMAL_RESULT:
{
uint8 dec= decimals;
uint8 intg= decimal_precision() - dec;
uint32 len= max_length;
/*
Trying to put too many digits overall in a DECIMAL(prec,dec)
will always throw a warning. We must limit dec to
DECIMAL_MAX_SCALE however to prevent an assert() later.
*/
if (dec > 0)
{
int overflow;
dec= min(dec, DECIMAL_MAX_SCALE);
/*
If the value still overflows the field with the corrected dec,
we'll throw out decimals rather than integers. This is still
bad and of course throws a truncation warning.
*/
const int required_length=
my_decimal_precision_to_length(intg + dec, dec,
unsigned_flag);
overflow= required_length - len;
if (overflow > 0)
dec= max(0, dec - overflow); // too long, discard fract
else
/* Corrected value fits. */
len= required_length;
}
field= new Field_new_decimal(len, maybe_null, name, dec, unsigned_flag);
field= Field_new_decimal::create_from_item(this);
break;
}
case ROW_RESULT:
default:
// This case should never be chosen