SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function midpoint (alias result) (children 1)
     ExpressionList (children 2)
      Function toTime64 (children 1)
       ExpressionList (children 2)
        Literal \'12:00:00\'
        Literal UInt64_0
      Function toTime64 (children 1)
       ExpressionList (children 2)
        Literal \'14:00:00\'
        Literal UInt64_0
    Function toTypeName (alias type) (children 1)
     ExpressionList (children 1)
      Identifier result