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Bug#45261: Crash, stored procedure + decimal

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The problem was that creating a DECIMAL column from a decimal
value could lead to a failed assertion as decimal values can
have a higher precision than those attached to a table. The
assert could be triggered by creating a table from a decimal
with a large (> 30) scale. Also, there was a problem in
calculating the number of digits in the integral and fractional
parts if both exceeded the maximum number of digits permitted
by the new decimal type.

The solution is to ensure that truncation procedure is executed
when deducing a DECIMAL column from a decimal value of higher
precision. If the integer part is equal to or bigger than the
maximum precision for the DECIMAL type (65), the integer part
is truncated to fit and the fractional becomes zero. Otherwise,
the fractional part is truncated to fit into the space left
after the integer part is copied.

This patch borrows code and ideas from Martin Hansson's patch.
This commit is contained in:
Davi Arnaut
2009-08-24 16:47:08 -03:00
parent 793e523b4e
commit 31afccc407
12 changed files with 483 additions and 110 deletions
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220
mysql-test/r/type_newdecimal.result
View File

@@ -1495,9 +1495,9 @@ CREATE TABLE t1 (a int DEFAULT NULL, b int DEFAULT NULL);
INSERT INTO t1 VALUES (3,30), (1,10), (2,10);
SELECT a+CAST(1 AS decimal(65,30)) AS aa, SUM(b) FROM t1 GROUP BY aa;
aa SUM(b)
2.000000000000000000000000000000 10
3.000000000000000000000000000000 10
4.000000000000000000000000000000 30
2.00000000000000000000000000000 10
3.00000000000000000000000000000 10
4.00000000000000000000000000000 30
SELECT a+CAST(1 AS decimal(65,31)) AS aa, SUM(b) FROM t1 GROUP BY aa;
ERROR 42000: Too big scale 31 specified for column '1'. Maximum is 30.
DROP TABLE t1;
@@ -1521,13 +1521,13 @@ f1
DROP TABLE t1;
CREATE TABLE t1 SELECT 123451234512345123451234512345123451234512345.678906789067890678906789067890678906789067890 AS f1;
Warnings:
Warning 1264 Out of range value for column 'f1' at row 1
Note 1265 Data truncated for column 'f1' at row 1
DESC t1;
Field Type Null Key Default Extra
f1 decimal(65,30) NO 0.000000000000000000000000000000
f1 decimal(65,20) NO 0.00000000000000000000
SELECT f1 FROM t1;
f1
99999999999999999999999999999999999.999999999999999999999999999999
123451234512345123451234512345123451234512345.67890678906789067891
DROP TABLE t1;
select (1.20396873 * 0.89550000 * 0.68000000 * 1.08721696 * 0.99500000 *
1.01500000 * 1.01500000 * 0.99500000);
@@ -1595,7 +1595,7 @@ Warnings:
Note 1265 Data truncated for column 'my_col' at row 1
DESCRIBE t1;
Field Type Null Key Default Extra
my_col decimal(65,30) NO 0.000000000000000000000000000000
my_col decimal(32,30) NO 0.000000000000000000000000000000
SELECT my_col FROM t1;
my_col
1.123456789123456789123456789123
@@ -1625,8 +1625,212 @@ Warnings:
Note 1265 Data truncated for column 'my_col' at row 1
DESCRIBE t1;
Field Type Null Key Default Extra
my_col decimal(65,30) YES NULL
my_col decimal(30,30) YES NULL
SELECT my_col FROM t1;
my_col
0.012345687012345687012345687012
DROP TABLE t1;
#
# Bug#45261: Crash, stored procedure + decimal
#
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 SELECT
/* 81 */ 100000000000000000000000000000000000000000000000000000000000000000000000000000001
AS c1;
Warnings:
Warning 1264 Out of range value for column 'c1' at row 1
DESC t1;
Field Type Null Key Default Extra
c1 decimal(65,0) NO 0
SELECT * FROM t1;
c1
99999999999999999999999999999999999999999999999999999999999999999
DROP TABLE t1;
CREATE TABLE t1 SELECT
/* 81 */ 100000000000000000000000000000000000000000000000000000000000000000000000000000001.
AS c1;
Warnings:
Warning 1264 Out of range value for column 'c1' at row 1
DESC t1;
Field Type Null Key Default Extra
c1 decimal(65,0) NO 0
SELECT * FROM t1;
c1
99999999999999999999999999999999999999999999999999999999999999999
DROP TABLE t1;
CREATE TABLE t1 SELECT
/* 81 */ 100000000000000000000000000000000000000000000000000000000000000000000000000000001.1 /* 1 */
AS c1;
Warnings:
Warning 1264 Out of range value for column 'c1' at row 1
DESC t1;
Field Type Null Key Default Extra
c1 decimal(65,0) NO 0
SELECT * FROM t1;
c1
99999999999999999999999999999999999999999999999999999999999999999
DROP TABLE t1;
CREATE TABLE t1 SELECT
/* 82 */ 1000000000000000000000000000000000000000000000000000000000000000000000000000000001
AS c1;
Warnings:
Error 1292 Truncated incorrect DECIMAL value: ''
DESC t1;
Field Type Null Key Default Extra
c1 decimal(65,0) NO 0
SELECT * FROM t1;
c1
99999999999999999999999999999999999999999999999999999999999999999
DROP TABLE t1;
CREATE TABLE t1 SELECT
/* 40 */ 1000000000000000000000000000000000000001.1000000000000000000000000000000000000001 /* 40 */
AS c1;
DESC t1;
Field Type Null Key Default Extra
c1 decimal(65,25) NO 0.0000000000000000000000000
SELECT * FROM t1;
c1
1000000000000000000000000000000000000001.1000000000000000000000000
DROP TABLE t1;
CREATE TABLE t1 SELECT
/* 1 */ 1.10000000000000000000000000000000000000000000000000000000000000000000000000000001 /* 80 */
AS c1;
DESC t1;
Field Type Null Key Default Extra
c1 decimal(31,30) NO 0.000000000000000000000000000000
SELECT * FROM t1;
c1
1.100000000000000000000000000000
DROP TABLE t1;
CREATE TABLE t1 SELECT
/* 1 */ 1.100000000000000000000000000000000000000000000000000000000000000000000000000000001 /* 81 */
AS c1;
DESC t1;
Field Type Null Key Default Extra
c1 decimal(31,30) NO 0.000000000000000000000000000000
SELECT * FROM t1;
c1
1.100000000000000000000000000000
DROP TABLE t1;
CREATE TABLE t1 SELECT
.100000000000000000000000000000000000000000000000000000000000000000000000000000001 /* 81 */
AS c1;
Warnings:
Note 1265 Data truncated for column 'c1' at row 1
DESC t1;
Field Type Null Key Default Extra
c1 decimal(30,30) NO 0.000000000000000000000000000000
SELECT * FROM t1;
c1
0.100000000000000000000000000000
DROP TABLE t1;
CREATE TABLE t1 SELECT
/* 45 */ 123456789012345678901234567890123456789012345.123456789012345678901234567890123456789012345 /* 45 */
AS c1;
Warnings:
Note 1265 Data truncated for column 'c1' at row 1
DESC t1;
Field Type Null Key Default Extra
c1 decimal(65,20) NO 0.00000000000000000000
SELECT * FROM t1;
c1
123456789012345678901234567890123456789012345.12345678901234567890
DROP TABLE t1;
CREATE TABLE t1 SELECT
/* 65 */ 12345678901234567890123456789012345678901234567890123456789012345.1 /* 1 */
AS c1;
Warnings:
Note 1265 Data truncated for column 'c1' at row 1
DESC t1;
Field Type Null Key Default Extra
c1 decimal(65,0) NO 0
SELECT * FROM t1;
c1
12345678901234567890123456789012345678901234567890123456789012345
DROP TABLE t1;
CREATE TABLE t1 SELECT
/* 66 */ 123456789012345678901234567890123456789012345678901234567890123456.1 /* 1 */
AS c1;
Warnings:
Warning 1264 Out of range value for column 'c1' at row 1
DESC t1;
Field Type Null Key Default Extra
c1 decimal(65,0) NO 0
SELECT * FROM t1;
c1
99999999999999999999999999999999999999999999999999999999999999999
DROP TABLE t1;
CREATE TABLE t1 SELECT
.123456789012345678901234567890123456789012345678901234567890123456 /* 66 */
AS c1;
Warnings:
Note 1265 Data truncated for column 'c1' at row 1
DESC t1;
Field Type Null Key Default Extra
c1 decimal(30,30) NO 0.000000000000000000000000000000
SELECT * FROM t1;
c1
0.123456789012345678901234567890
DROP TABLE t1;
CREATE TABLE t1 AS SELECT 123.1234567890123456789012345678901 /* 31 */ AS c1;
Warnings:
Note 1265 Data truncated for column 'c1' at row 1
DESC t1;
Field Type Null Key Default Extra
c1 decimal(33,30) NO 0.000000000000000000000000000000
SELECT * FROM t1;
c1
123.123456789012345678901234567890
DROP TABLE t1;
CREATE TABLE t1 SELECT 1.1 + CAST(1 AS DECIMAL(65,30)) AS c1;
DESC t1;
Field Type Null Key Default Extra
c1 decimal(65,29) NO 0.00000000000000000000000000000
SELECT * FROM t1;
c1
2.10000000000000000000000000000
DROP TABLE t1;
#
# Test that the integer and decimal parts are properly calculated.
#
CREATE TABLE t1 (a DECIMAL(30,30));
INSERT INTO t1 VALUES (0.1),(0.2),(0.3);
CREATE TABLE t2 SELECT MIN(a + 0.0000000000000000000000000000001) AS c1 FROM t1;
Warnings:
Note 1265 Data truncated for column 'c1' at row 3
DESC t2;
Field Type Null Key Default Extra
c1 decimal(32,30) YES NULL
DROP TABLE t1,t2;
CREATE TABLE t1 (a DECIMAL(30,30));
INSERT INTO t1 VALUES (0.1),(0.2),(0.3);
CREATE TABLE t2 SELECT IFNULL(a + 0.0000000000000000000000000000001, NULL) AS c1 FROM t1;
Warnings:
Note 1265 Data truncated for column 'c1' at row 1
Note 1265 Data truncated for column 'c1' at row 2
Note 1265 Data truncated for column 'c1' at row 3
DESC t2;
Field Type Null Key Default Extra
c1 decimal(32,30) YES NULL
DROP TABLE t1,t2;
CREATE TABLE t1 (a DECIMAL(30,30));
INSERT INTO t1 VALUES (0.1),(0.2),(0.3);
CREATE TABLE t2 SELECT CASE a WHEN 0.1 THEN 0.0000000000000000000000000000000000000000000000000000000000000000001 END AS c1 FROM t1;
Warnings:
Note 1265 Data truncated for column 'c1' at row 1
DESC t2;
Field Type Null Key Default Extra
c1 decimal(31,30) YES NULL
DROP TABLE t1,t2;
#
# Test that variables get maximum precision.
#
SET @decimal= 1.1;
CREATE TABLE t1 SELECT @decimal AS c1;
DESC t1;
Field Type Null Key Default Extra
c1 decimal(65,30) YES NULL
SELECT * FROM t1;
c1
1.100000000000000000000000000000
DROP TABLE t1;