SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function midpoint (alias result) (children 1)
     ExpressionList (children 2)
      Identifier i8
      Identifier i16
    Function toTypeName (alias type) (children 1)
     ExpressionList (children 1)
      Identifier result
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier midpoint_test