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Bug#16194302: SUPPORT FOR FLOATING-POINT SYSTEM VARIABLES

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USING THE PLUGIN INTERFACE.

ISSUE: No support for floating-point plugin
       system variables.

SOLUTION: Allowing plugins to define and expose floating-point
          system variables of type double. MYSQL_SYSVAR_DOUBLE
          and MYSQL_THDVAR_DOUBLE are added.

ISSUE: Fractional part of the def, min, max values of system
       variables are ignored.

SOLUTION: Adding functions that are used to store the raw
          representation of a double in the raw bits of unsigned
          longlong in a way that the binary representation
          remains the same.
This commit is contained in:
Ashish Agarwal
2013-05-19 23:38:06 +05:30
parent 5ca36b3b46
commit 0c4f4ff015
8 changed files with 280 additions and 12 deletions
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82
mysql-test/r/plugin.result
View File

@ -16,9 +16,11 @@ set global example_ulong_var=500;
set global example_enum_var= e1;
show status like 'example%';
Variable_name Value
example_func_example enum_var is 0, ulong_var is 500, really
example_func_example enum_var is 0, ulong_var is 500, double_var is 8.500000, really
show variables like 'example%';
Variable_name Value
example_double_thdvar 8.500000
example_double_var 8.500000
example_enum_var e1
example_ulong_var 500
UNINSTALL PLUGIN example;
@ -63,3 +65,81 @@ set session sql_mode=@old_sql_mode;
set session old=bla;
ERROR HY000: Variable 'old' is a read only variable
UNINSTALL PLUGIN example;
#
# Bug #16194302 SUPPORT FOR FLOATING-POINT SYSTEM
# VARIABLES USING THE PLUGIN INTERFACE.
#
INSTALL PLUGIN example SONAME 'ha_example.so';
SET GLOBAL example_double_var = -0.1;
Warnings:
Warning 1292 Truncated incorrect example_double_var value: '-0.1'
SELECT @@GLOBAL.example_double_var;
@@GLOBAL.example_double_var
0.500000
SET GLOBAL example_double_var = 0.000001;
Warnings:
Warning 1292 Truncated incorrect example_double_var value: '0.000001'
SELECT @@GLOBAL.example_double_var;
@@GLOBAL.example_double_var
0.500000
SET GLOBAL example_double_var = 0.4;
Warnings:
Warning 1292 Truncated incorrect example_double_var value: '0.4'
SELECT @@GLOBAL.example_double_var;
@@GLOBAL.example_double_var
0.500000
SET GLOBAL example_double_var = 123.456789;
SELECT @@GLOBAL.example_double_var;
@@GLOBAL.example_double_var
123.456789
SET GLOBAL example_double_var = 500;
SELECT @@GLOBAL.example_double_var;
@@GLOBAL.example_double_var
500.000000
SET GLOBAL example_double_var = 999.999999;
SELECT @@GLOBAL.example_double_var;
@@GLOBAL.example_double_var
999.999999
SET GLOBAL example_double_var = 1000.51;
Warnings:
Warning 1292 Truncated incorrect example_double_var value: '1000.51'
SELECT @@GLOBAL.example_double_var;
@@GLOBAL.example_double_var
1000.500000
SET SESSION example_double_thdvar = -0.1;
Warnings:
Warning 1292 Truncated incorrect example_double_thdvar value: '-0.1'
SELECT @@SESSION.example_double_thdvar;
@@SESSION.example_double_thdvar
0.500000
SET SESSION example_double_thdvar = 0.000001;
Warnings:
Warning 1292 Truncated incorrect example_double_thdvar value: '0.000001'
SELECT @@SESSION.example_double_thdvar;
@@SESSION.example_double_thdvar
0.500000
SET SESSION example_double_thdvar = 0.4;
Warnings:
Warning 1292 Truncated incorrect example_double_thdvar value: '0.4'
SELECT @@SESSION.example_double_thdvar;
@@SESSION.example_double_thdvar
0.500000
SET SESSION example_double_thdvar = 123.456789;
SELECT @@SESSION.example_double_thdvar;
@@SESSION.example_double_thdvar
123.456789
SET SESSION example_double_thdvar = 500;
SELECT @@SESSION.example_double_thdvar;
@@SESSION.example_double_thdvar
500.000000
SET SESSION example_double_thdvar = 999.999999;
SELECT @@SESSION.example_double_thdvar;
@@SESSION.example_double_thdvar
999.999999
SET SESSION example_double_thdvar = 1000.51;
Warnings:
Warning 1292 Truncated incorrect example_double_thdvar value: '1000.51'
SELECT @@SESSION.example_double_thdvar;
@@SESSION.example_double_thdvar
1000.500000
UNINSTALL PLUGIN example;