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HASH user_vars; /**< Hash of user variables defined during the session's lifetime */
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struct system_variables variables; /**< Mutable local variables local to the session */
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struct system_status_var status_var; /**< Session-local status counters */
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THR_LOCK_INFO lock_info; /**< Locking information for this session */
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THR_LOCK_OWNER main_lock_id; /**< To use for conventional queries */
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THR_LOCK_OWNER *lock_id; /**< If not main_lock_id, points to the lock_id of a cursor. */