SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function midpoint (alias result) (children 1)
     ExpressionList (children 2)
      Identifier d32
      Identifier d64
    Function toTypeName (alias type) (children 1)
     ExpressionList (children 1)
      Identifier result
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier midpoint_test