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static const std::vector<std::string> empty_aliases;
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extern struct system_variables max_system_variables;
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extern size_t table_def_size;
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extern char *drizzle_tmpdir;
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extern const char *first_keyword;
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extern const char *in_left_expr_name;
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extern const char *in_additional_cond;
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extern const char *in_having_cond;
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extern char language[FN_REFLEN];
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extern char glob_hostname[FN_REFLEN];
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extern char drizzle_home[FN_REFLEN];
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extern char pidfile_name[FN_REFLEN];
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extern char system_time_zone[30];
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extern char *opt_tc_log_file;
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extern uint64_t session_startup_options;
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extern uint32_t global_thread_id;
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extern uint64_t aborted_threads;
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extern uint64_t aborted_connects;
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extern uint64_t table_cache_size;
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extern uint64_t max_connect_errors;
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extern uint32_t back_log;
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extern uint32_t ha_open_options;
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extern char *drizzled_bind_host;
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extern uint32_t dropping_tables;
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extern bool opt_endinfo;
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extern bool locked_in_memory;
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extern uint32_t volatile thread_running;
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extern uint32_t volatile global_read_lock;
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extern bool opt_readonly;
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extern char* opt_secure_file_priv;
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extern char *default_tz_name;
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struct sys_var_chain