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Commit 62d73df6 authored by Varun Gupta's avatar Varun Gupta
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MDEV-19232: Floating point precision / value comparison problem 

The issue occurs when the subquery_cache is enabled.
When there is a cache miss the division was leading to a value with scale 9.
In the case of cache hit the value returned was of scale 9 and due to the different
values for the scales the where condition evaluated to FALSE, hence the output
was incomplete.

To fix this problem we need to round up the decimal to the limit mentioned in
Item::decimals. This would make sure the values are compared with the same
scale.
parent 57ec42bc
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Showing with 68 additions and 30 deletions
mysql-test/r/func_group.result
View file @ 62d73df6
......@@ -1186,13 +1186,13 @@ i count(*) std(e1/e2)
3 4 0.00000000
select std(s1/s2) from bug22555;
std(s1/s2)
0.21325764
0.21328517
select std(o1/o2) from bug22555;
std(o1/o2)
0.2132576358664934
select std(e1/e2) from bug22555;
std(e1/e2)
0.21325764
0.21328517
set @saved_div_precision_increment=@@div_precision_increment;
set div_precision_increment=19;
select i, count(*), std(s1/s2) from bug22555 group by i order by i;
......
mysql-test/r/parser_precedence.result
View file @ 62d73df6
......@@ -619,7 +619,7 @@ select 4 - 3 * 2, (4 - 3) * 2, 4 - (3 * 2);
Testing that / is left associative
select 15 / 5 / 3, (15 / 5) / 3, 15 / (5 / 3);
15 / 5 / 3 (15 / 5) / 3 15 / (5 / 3)
1.00000000 1.00000000 9.0000
1.00000000 1.00000000 8.9998
Testing that / has precedence over |
select 105 / 5 | 2, (105 / 5) | 2, 105 / (5 | 2);
105 / 5 | 2 (105 / 5) | 2 105 / (5 | 2)
......
mysql-test/r/subselect4.result
View file @ 62d73df6
......@@ -2584,3 +2584,27 @@ l1 i2
e 2
o 6
DROP TABLE t1, t2;
#
# MDEV-19232: Floating point precision / value comparison problem
#
CREATE TABLE t1 (region varchar(60), area decimal(10,0), population decimal(11,0));
INSERT INTO t1 VALUES ('Central America and the Caribbean',91,11797);
INSERT INTO t1 VALUES ('Central America and the Caribbean',442,66422);
SET @save_optimizer_switch=@@optimizer_switch;
SET optimizer_switch='subquery_cache=on';
SELECT
population, area, population/area,
cast(population/area as DECIMAL(20,9)) FROM t1 LIMIT 1;
population area population/area cast(population/area as DECIMAL(20,9))
11797 91 129.6374 129.637400000
SELECT * FROM t1 A
WHERE population/area = (SELECT MAX(population/area) from t1 B where A.region = B.region);
region area population
Central America and the Caribbean 442 66422
SET optimizer_switch='subquery_cache=off';
SELECT * FROM t1 A
WHERE population/area = (SELECT MAX(population/area) from t1 B where A.region = B.region);
region area population
Central America and the Caribbean 442 66422
SET @@optimizer_switch= @save_optimizer_switch;
DROP TABLE t1;
mysql-test/r/type_newdecimal.result
View file @ 62d73df6
......@@ -1530,11 +1530,8 @@ select (1.20396873 * 0.89550000 * 0.68000000 * 1.08721696 * 0.99500000 *
1.01500000 * 1.01500000 * 0.99500000)
0.812988073953673124592306939480
create table t1 as select 5.05 / 0.014;
Warnings:
Note 1265 Data truncated for column '5.05 / 0.014' at row 1
show warnings;
Level Code Message
Note 1265 Data truncated for column '5.05 / 0.014' at row 1
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
......@@ -1649,8 +1646,6 @@ my_col
0.123456789123456789123456789123
DROP TABLE t1;
CREATE TABLE t1 SELECT 1 / .123456789123456789123456789123456789123456789123456789123456789123456789123456789 AS my_col;
Warnings:
Note 1265 Data truncated for column 'my_col' at row 1
DESCRIBE t1;
Field Type Null Key Default Extra
my_col decimal(65,4) YES NULL
......
mysql-test/r/type_ranges.result
View file @ 62d73df6
......@@ -94,8 +94,6 @@ DROP INDEX test ON t1;
insert into t1 values (10, 1,1,1,1,1,1,1,1,1,1,1,1,1,NULL,0,0,0,1,1,1,1,'one','one');
insert into t1 values (NULL,2,2,2,2,2,2,2,2,2,2,2,2,2,NULL,NULL,NULL,NULL,NULL,NULL,2,2,'two','two,one');
insert into t1 values (0,1/3,3,3,3,3,3,3,3,3,3,3,3,3,NULL,'19970303','10:10:10','19970303101010','','','','3',3,3);
Warnings:
Warning 1265 Data truncated for column 'string' at row 1
insert into t1 values (0,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,NULL,19970807,080706,19970403090807,-1,-1,-1,'-1',-1,-1);
Warnings:
Warning 1264 Out of range value for column 'utiny' at row 1
......@@ -136,7 +134,7 @@ select auto,string,tiny,short,medium,long_int,longlong,real_float,real_double,ut
auto string tiny short medium long_int longlong real_float real_double utiny ushort umedium ulong ulonglong mod(floor(time_stamp/1000000),1000000)-mod(curdate(),1000000) date_field time_field date_time blob_col tinyblob_col mediumblob_col longblob_col
10 1 1 1 1 1 1 1.0 1.0000 1 00001 1 1 1 0 0000-00-00 00:00:00 0000-00-00 00:00:00 1 1 1 1
11 2 2 2 2 2 2 2.0 2.0000 2 00002 2 2 2 0 NULL NULL NULL NULL NULL 2 2
12 0.33333333 3 3 3 3 3 3.0 3.0000 3 00003 3 3 3 0 1997-03-03 10:10:10 1997-03-03 10:10:10 3
12 0.3333 3 3 3 3 3 3.0 3.0000 3 00003 3 3 3 0 1997-03-03 10:10:10 1997-03-03 10:10:10 3
13 -1 -1 -1 -1 -1 -1 -1.0 -1.0000 0 00000 0 0 0 0 1997-08-07 08:07:06 1997-04-03 09:08:07 -1 -1 -1 -1
14 -429496729 -128 -32768 -8388608 -2147483648 -4294967295 -4294967296.0 -4294967295.0000 0 00000 0 0 0 0 0000-00-00 00:00:00 0000-00-00 00:00:00 -4294967295 -4294967295 -4294967295 -4294967295
15 4294967295 127 32767 8388607 2147483647 4294967295 4294967296.0 4294967295.0000 255 65535 16777215 4294967295 4294967295 0 0000-00-00 00:00:00 0000-00-00 00:00:00 4294967295 4294967295 4294967295 4294967295
......@@ -188,7 +186,7 @@ Warning 1265 Data truncated for column 'new_field' at row 7
select * from t2;
auto string mediumblob_col new_field
1 2 2 ne
2 0.33333333 ne
2 0.3333 ne
3 -1 -1 ne
4 -429496729 -4294967295 ne
5 4294967295 4294967295 ne
......
mysql-test/suite/sys_vars/r/div_precision_increment_func.result
View file @ 62d73df6
......@@ -50,9 +50,9 @@ INSERT into t1(name, salary, income_tax) values('Record_2', 501, 501*2.5/1000);
INSERT into t1(name, salary, income_tax) values('Record_3', 210, 210*2.5/1000);
SELECT * from t1;
id name salary income_tax
1 Record_1 100011 250.027
2 Record_2 501 1.2525
3 Record_3 210 0.525
1 Record_1 100011 250.03
2 Record_2 501 1.25
3 Record_3 210 0.53
## Creating new connection ##
## Verifying session & global value of variable ##
SELECT @@global.div_precision_increment = 2;
......@@ -67,11 +67,11 @@ INSERT into t1(name, salary, income_tax) values('Record_5', 501, 501*2.5/1000);
INSERT into t1(name, salary, income_tax) values('Record_6', 210, 210*2.5/1000);
SELECT * from t1;
id name salary income_tax
1 Record_1 100011 250.027
2 Record_2 501 1.2525
3 Record_3 210 0.525
4 Record_4 100011 250.027
5 Record_5 501 1.2525
1 Record_1 100011 250.03
2 Record_2 501 1.25
3 Record_3 210 0.53
4 Record_4 100011 250.028
5 Record_5 501 1.253
6 Record_6 210 0.525
## Dropping table t1 ##
drop table t1;
......
mysql-test/suite/vcol/r/not_supported.result
View file @ 62d73df6
......@@ -51,7 +51,7 @@ a b v
flush tables;
select * from t1;
a b v
1 2 0.3333333330000000000
1 2 0.3333000000000000000
select * from t5;
a b v
20141010 2 October
......
mysql-test/t/subselect4.test
View file @ 62d73df6
......@@ -2112,3 +2112,29 @@ INSERT INTO t2 VALUES ('k'),('rid'),('f'),('x');
EXPLAIN EXTENDED SELECT * FROM t1 where ( t1.l1 < ANY (SELECT MAX(t2.v1) FROM t2));
SELECT * FROM t1 where ( t1.l1 < ANY (SELECT MAX(t2.v1) FROM t2));
DROP TABLE t1, t2;
--echo #
--echo # MDEV-19232: Floating point precision / value comparison problem
--echo #
CREATE TABLE t1 (region varchar(60), area decimal(10,0), population decimal(11,0));
INSERT INTO t1 VALUES ('Central America and the Caribbean',91,11797);
INSERT INTO t1 VALUES ('Central America and the Caribbean',442,66422);
SET @save_optimizer_switch=@@optimizer_switch;
SET optimizer_switch='subquery_cache=on';
SELECT
population, area, population/area,
cast(population/area as DECIMAL(20,9)) FROM t1 LIMIT 1;
SELECT * FROM t1 A
WHERE population/area = (SELECT MAX(population/area) from t1 B where A.region = B.region);
SET optimizer_switch='subquery_cache=off';
SELECT * FROM t1 A
WHERE population/area = (SELECT MAX(population/area) from t1 B where A.region = B.region);
SET @@optimizer_switch= @save_optimizer_switch;
DROP TABLE t1;
sql/item_func.cc
View file @ 62d73df6
......@@ -1719,6 +1719,8 @@ my_decimal *Item_func_div::decimal_op(my_decimal *decimal_value)
null_value= 1;
return 0;
}
my_decimal_round(E_DEC_FATAL_ERROR, decimal_value,
decimals, FALSE, decimal_value);
return decimal_value;
}
......
storage/tokudb/mysql-test/tokudb/r/type_newdecimal.result
View file @ 62d73df6
......@@ -1531,11 +1531,8 @@ select (1.20396873 * 0.89550000 * 0.68000000 * 1.08721696 * 0.99500000 *
1.01500000 * 1.01500000 * 0.99500000)
0.812988073953673124592306939480
create table t1 as select 5.05 / 0.014;
Warnings:
Note 1265 Data truncated for column '5.05 / 0.014' at row 1
show warnings;
Level Code Message
Note 1265 Data truncated for column '5.05 / 0.014' at row 1
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
......@@ -1650,8 +1647,6 @@ my_col
0.123456789123456789123456789123
DROP TABLE t1;
CREATE TABLE t1 SELECT 1 / .123456789123456789123456789123456789123456789123456789123456789123456789123456789 AS my_col;
Warnings:
Note 1265 Data truncated for column 'my_col' at row 1
DESCRIBE t1;
Field Type Null Key Default Extra
my_col decimal(65,4) YES NULL
......
storage/tokudb/mysql-test/tokudb/r/type_ranges.result
View file @ 62d73df6
......@@ -95,8 +95,6 @@ DROP INDEX test ON t1;
insert into t1 values (10, 1,1,1,1,1,1,1,1,1,1,1,1,1,NULL,0,0,0,1,1,1,1,'one','one');
insert into t1 values (NULL,2,2,2,2,2,2,2,2,2,2,2,2,2,NULL,NULL,NULL,NULL,NULL,NULL,2,2,'two','two,one');
insert into t1 values (0,1/3,3,3,3,3,3,3,3,3,3,3,3,3,NULL,'19970303','10:10:10','19970303101010','','','','3',3,3);
Warnings:
Warning 1265 Data truncated for column 'string' at row 1
insert into t1 values (0,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,NULL,19970807,080706,19970403090807,-1,-1,-1,'-1',-1,-1);
Warnings:
Warning 1264 Out of range value for column 'utiny' at row 1
......@@ -137,7 +135,7 @@ select auto,string,tiny,short,medium,long_int,longlong,real_float,real_double,ut
auto string tiny short medium long_int longlong real_float real_double utiny ushort umedium ulong ulonglong mod(floor(time_stamp/1000000),1000000)-mod(curdate(),1000000) date_field time_field date_time blob_col tinyblob_col mediumblob_col longblob_col
10 1 1 1 1 1 1 1.0 1.0000 1 00001 1 1 1 0 0000-00-00 00:00:00 0000-00-00 00:00:00 1 1 1 1
11 2 2 2 2 2 2 2.0 2.0000 2 00002 2 2 2 0 NULL NULL NULL NULL NULL 2 2
12 0.33333333 3 3 3 3 3 3.0 3.0000 3 00003 3 3 3 0 1997-03-03 10:10:10 1997-03-03 10:10:10 3
12 0.3333 3 3 3 3 3 3.0 3.0000 3 00003 3 3 3 0 1997-03-03 10:10:10 1997-03-03 10:10:10 3
13 -1 -1 -1 -1 -1 -1 -1.0 -1.0000 0 00000 0 0 0 0 1997-08-07 08:07:06 1997-04-03 09:08:07 -1 -1 -1 -1
14 -429496729 -128 -32768 -8388608 -2147483648 -4294967295 -4294967296.0 -4294967295.0000 0 00000 0 0 0 0 0000-00-00 00:00:00 0000-00-00 00:00:00 -4294967295 -4294967295 -4294967295 -4294967295
15 4294967295 127 32767 8388607 2147483647 4294967295 4294967296.0 4294967295.0000 255 65535 16777215 4294967295 4294967295 0 0000-00-00 00:00:00 0000-00-00 00:00:00 4294967295 4294967295 4294967295 4294967295
......@@ -189,7 +187,7 @@ Warning 1265 Data truncated for column 'new_field' at row 7
select * from t2;
auto string mediumblob_col new_field
1 2 2 ne
2 0.33333333 ne
2 0.3333 ne
3 -1 -1 ne
4 -429496729 -4294967295 ne
5 4294967295 4294967295 ne
......
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