SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 6)
    Identifier col3.n1
    Identifier col3.n2
    Identifier col3.n1.a
    Identifier col3.n1.b
    Identifier col3.n2.s
    Identifier col3.n2.t
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier nested
