SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Function format (alias all) (children 1)
     ExpressionList (children 3)
      Literal \'{} {}\'
      Identifier a
      Identifier b
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier order_by_all
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier all
   Set
