public FromClause add(OuterJoinQualifier outerJoinQualifier){
  outerJoinQualifiers.add(outerJoinQualifier);
  return this;
}

public FromClause add ( OuterJoinQualifier outerJoinQualifier ) { outerJoinQualifiers . add ( outerJoinQualifier ) ; return this ; }
adds an outer join descriptor that defines how the streams are related via outer joins . < p > for joining n streams , add n - 1 outer join qualifiers .
