SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function midpoint (alias result) (children 1)
     ExpressionList (children 3)
      Identifier f32
      Identifier f64
      Literal Float64_42
    Function toTypeName (alias type) (children 1)
     ExpressionList (children 1)
      Identifier result
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier midpoint_test