SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function midpoint (alias result) (children 1)
     ExpressionList (children 2)
      Identifier ui8
      Identifier ui16
    Function toTypeName (alias type) (children 1)
     ExpressionList (children 1)
      Identifier result
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier midpoint_test