1"flat_key","key","int_value","string_value" 2"is_root_in_scope","is_root_in_scope",1,"[NULL]" 3"source","source","[NULL]","descriptor" 4"source_id","source_id",0,"[NULL]" 5"chrome_user_event.action","chrome_user_event.action","[NULL]","action1" 6"chrome_user_event.action_hash","chrome_user_event.action_hash",10,"[NULL]" 7"chrome_user_event.action","chrome_user_event.action","[NULL]","action2" 8"chrome_user_event.action_hash","chrome_user_event.action_hash",20,"[NULL]" 9"chrome_user_event.action_hash","chrome_user_event.action_hash",30,"[NULL]" 10