| "flat_key","key","int_value","string_value" |
| "is_root_in_scope","is_root_in_scope",1,"[NULL]" |
| "source","source","[NULL]","descriptor" |
| "source_id","source_id",12345,"[NULL]" |
| "chrome_user_event.action","chrome_user_event.action","[NULL]","action1" |
| "chrome_user_event.action_hash","chrome_user_event.action_hash",10,"[NULL]" |
| "chrome_user_event.action","chrome_user_event.action","[NULL]","action2" |
| "chrome_user_event.action_hash","chrome_user_event.action_hash",20,"[NULL]" |
| "chrome_user_event.action_hash","chrome_user_event.action_hash",30,"[NULL]" |
