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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.
80 lines
2.5 KiB
Plaintext
80 lines
2.5 KiB
Plaintext
drop table if exists t1;
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## Creating new table ##
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CREATE TABLE t1
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(
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id INT NOT NULL auto_increment,
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PRIMARY KEY (id),
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name VARCHAR(30),
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salary INT
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);
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'#--------------------FN_DYNVARS_027_01-------------------------#'
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## Setting initial session value of variable to 3 ##
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SET @@session.div_precision_increment = 3;
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## Inserting some rows in table ##
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INSERT into t1(name, salary) values('Record_1', 100011);
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INSERT into t1(name, salary) values('Record_2', 501);
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INSERT into t1(name, salary) values('Record_3', 210);
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SELECT name, salary, ((salary * 2.5)/1000) AS INCOME from t1;
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name salary INCOME
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Record_1 100011 250.0275
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Record_2 501 1.2525
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Record_3 210 0.5250
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## Verifying variable's behavior with direct division ##
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SELECT 1/7;
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1/7
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0.143
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'#--------------------FN_DYNVARS_027_02-------------------------#'
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drop table if exists t1;
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## Creating new table ##
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CREATE TABLE t1
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(
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id INT NOT NULL auto_increment,
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PRIMARY KEY (id),
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name VARCHAR(30),
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salary INT,
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income_tax FLOAT
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);
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## Creating new connection test_con1 ##
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## Setting global & session scope value of variable ##
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SET @@global.div_precision_increment = 2;
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SET @@session.div_precision_increment = 1;
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SELECT @@global.div_precision_increment;
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@@global.div_precision_increment
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2
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SELECT @@session.div_precision_increment;
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@@session.div_precision_increment
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1
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## Inserting some data and verifying behavior of variable ##
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INSERT into t1(name, salary, income_tax) values('Record_1', 100011, 100011*2.5/1000);
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INSERT into t1(name, salary, income_tax) values('Record_2', 501, 501*2.5/1000);
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INSERT into t1(name, salary, income_tax) values('Record_3', 210, 210*2.5/1000);
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SELECT * from t1;
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id name salary income_tax
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1 Record_1 100011 250.03
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2 Record_2 501 1.25
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3 Record_3 210 0.53
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## Creating new connection ##
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## Verifying session & global value of variable ##
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SELECT @@global.div_precision_increment = 2;
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@@global.div_precision_increment = 2
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1
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SELECT @@session.div_precision_increment = 2;
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@@session.div_precision_increment = 2
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1
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## Verifying behavior of variable by inserting some rows in table ##
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INSERT into t1(name, salary, income_tax) values('Record_4', 100011, 100011*2.5/1000);
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INSERT into t1(name, salary, income_tax) values('Record_5', 501, 501*2.5/1000);
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INSERT into t1(name, salary, income_tax) values('Record_6', 210, 210*2.5/1000);
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SELECT * from t1;
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id name salary income_tax
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1 Record_1 100011 250.03
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2 Record_2 501 1.25
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3 Record_3 210 0.53
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4 Record_4 100011 250.028
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5 Record_5 501 1.253
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6 Record_6 210 0.525
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## Dropping table t1 ##
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drop table t1;
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## Disconnection both the connections ##
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SET @@global.div_precision_increment = 4;
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