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#include <drizzled/function/func.h>
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#include <drizzled/lex_string.h>
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Item *get_system_var(Session *session, sql_var_t var_type, LEX_STRING name,
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Item* get_system_var(Session*, sql_var_t, str_ref name, str_ref component);
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Item_func_get_system_var(sys_var *var_arg, sql_var_t var_type_arg, str_ref component_arg, const char *name_arg, size_t name_len_arg);
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bool fix_fields(Session *session, Item **ref);
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Stubs for pure virtual methods. Should never be called: this