SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Identifier a
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier fooL
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier fooR
     TableJoin (children 1)
      ExpressionList (children 1)
       Identifier a
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier a