SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function dateTrunc (children 1)
     ExpressionList (children 2)
      Literal \'Nanosecond\'
      Function toDateTime64 (children 1)
       ExpressionList (children 2)
        Literal \'1950-03-01 12:12:12.0123\'
        Literal UInt64_3
