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Kristofer Pettersson authored
When the query cache is disabled, the server shouldn't attempt to take the query cache mutex. By using the command line option --query_cache_type=0, the user can disable (backport from mysql-pe) mysql-test/t/query_cache_disabled-master.opt: * added test case for bug38551 mysql-test/t/query_cache_disabled.test: * added test case for bug38551 sql/set_var.cc: * Added before-trigger to verify that query_cache_type wasn't turned off or on during runtime. sql/set_var.h: * Changed order on how the enumeration is processed. By first projecting the character representation of the variable to a temporary integer we can have one function instead of two to check if the value is valid. sql/share/errmsg-utf8.txt: * Added error message for query cache disabled state sql/sql_cache.cc: * If the query cache is disabled at start up, shorten the execution path and avoid grabbing the query cache mutex each time the invalidate interface methods are called. sql/sql_cache.h: * Added new methods to set the query cache into a disabled state.
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