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in this case when mapped against a select statement [ticket:904] - _hide_froms logic in expression totally localized to Join class, including search through previous clone sources - removed "stop_on" from main visitors, not used - "stop_on" in AbstractClauseProcessor part of constructor, ClauseAdapter sets it up based on given clause - fixes to is_derived_from() to take previous clone sources into account, Alias takes self + cloned sources into account. this is ultimately what the #904 bug was.