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https://github.com/MariaDB/server.git
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489ad44ab5
The code to get read the value of a system variable was extracting its value on PREPARE stage and was substituting the value (as a constant) into the parse tree. Note that this must be a reversible transformation, i.e. it must be reversed before each re-execution. Unfortunately this cannot be reliably done using the current code, because there are other non-reversible source tree transformations that can interfere with this reversible transformation. Fixed by not resolving the value at PREPARE, but at EXECUTE (as the rest of the functions operate). Added a cache of the value (so that it's constant throughout the execution of the query). Note that the cache also caches NULL values. Updated an obsolete related test suite (variables-big) and the code to test the result type of system variables (as per bug 74).
54 lines
1.8 KiB
Plaintext
54 lines
1.8 KiB
Plaintext
'#---------------------BS_STVARS_029_01----------------------#'
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SELECT COUNT(@@GLOBAL.innodb_flush_method);
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COUNT(@@GLOBAL.innodb_flush_method)
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1
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1 Expected
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'#---------------------BS_STVARS_029_02----------------------#'
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SET @@GLOBAL.innodb_flush_method=1;
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ERROR HY000: Variable 'innodb_flush_method' is a read only variable
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Expected error 'Read only variable'
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SELECT COUNT(@@GLOBAL.innodb_flush_method);
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COUNT(@@GLOBAL.innodb_flush_method)
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1
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1 Expected
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'#---------------------BS_STVARS_029_03----------------------#'
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SELECT @@GLOBAL.innodb_flush_method = VARIABLE_VALUE
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FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
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WHERE VARIABLE_NAME='innodb_flush_method';
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@@GLOBAL.innodb_flush_method = VARIABLE_VALUE
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NULL
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1 Expected
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SELECT COUNT(@@GLOBAL.innodb_flush_method);
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COUNT(@@GLOBAL.innodb_flush_method)
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1
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1 Expected
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SELECT COUNT(VARIABLE_VALUE)
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FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
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WHERE VARIABLE_NAME='innodb_flush_method';
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COUNT(VARIABLE_VALUE)
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1
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1 Expected
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'#---------------------BS_STVARS_029_04----------------------#'
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SELECT @@innodb_flush_method = @@GLOBAL.innodb_flush_method;
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@@innodb_flush_method = @@GLOBAL.innodb_flush_method
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NULL
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1 Expected
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'#---------------------BS_STVARS_029_05----------------------#'
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SELECT COUNT(@@innodb_flush_method);
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COUNT(@@innodb_flush_method)
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1
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1 Expected
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SELECT COUNT(@@local.innodb_flush_method);
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ERROR HY000: Variable 'innodb_flush_method' is a GLOBAL variable
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Expected error 'Variable is a GLOBAL variable'
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SELECT COUNT(@@SESSION.innodb_flush_method);
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ERROR HY000: Variable 'innodb_flush_method' is a GLOBAL variable
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Expected error 'Variable is a GLOBAL variable'
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SELECT COUNT(@@GLOBAL.innodb_flush_method);
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COUNT(@@GLOBAL.innodb_flush_method)
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1
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1 Expected
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SELECT innodb_flush_method = @@SESSION.innodb_flush_method;
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ERROR 42S22: Unknown column 'innodb_flush_method' in 'field list'
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Expected error 'Readonly variable'
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