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Backport of the patch for bug #8457 "Precision math: DIV

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returns incorrect result with large decimal value" 
 
For the DIV operator, neither operands nor result were checked 
for integer overflows. 
 
This patch changes the DIV behavior for non-integer operands as 
follows: if either of the operands has a non-integer type, 
convert both operands to the DECIMAL type, then calculate the 
division using DECIMAL arithmetics. Convert the resulting 
DECIMAL value into BIGINT [UNSIGNED] if it fits into the 
corresponding range, or throw an 'out of range' error 
otherwise. 

mysql-test/r/func_math.result:
  Added a test case for bug #8457.
  Fixed results for a test case depending on the wrong behavior.
mysql-test/r/type_varchar.result:
  Fixed results for a test case depending on the wrong behavior.
mysql-test/t/func_math.test:
  Added a test case for bug #8457.
sql/item_func.cc:
  If either of the operands has a non-integer type, convert both 
  operands to the DECIMAL type, then calculate the division using 
  DECIMAL arithmetics. Convert the resulting DECIMAL value into 
  BIGINT [UNSIGNED] if it fits into the corresponding range, or 
  throw an 'out of range' error otherwise.
This commit is contained in:
Alexey Kopytov
2009-10-13 12:31:42 +04:00
parent 4337c3808f
commit 7e3b4d21c0
4 changed files with 57 additions and 2 deletions
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11
mysql-test/t/func_math.test
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@@ -309,4 +309,15 @@ DROP TABLE t1;
--echo #
#
# Bug #8457: Precision math:
# DIV returns incorrect result with large decimal value
# Bug #46606:Casting error for large numbers in 5.4 when 'div' is used
--error ER_WARN_DATA_OUT_OF_RANGE
select 123456789012345678901234567890.123456789012345678901234567890 div 1 as x;
--error ER_WARN_DATA_OUT_OF_RANGE
select "123456789012345678901234567890.123456789012345678901234567890" div 1 as x;
SHOW WARNINGS;
--echo End of 5.1 tests