SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function toDateTime64 (alias dt64) (children 1)
     ExpressionList (children 3)
      Literal \'2019-09-16 19:20:11.123\'
      Literal UInt64_9
      Literal \'UTC\'
   ExpressionList (children 2)
    Function toStartOfSecond (alias res) (children 1)
     ExpressionList (children 1)
      Identifier dt64
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier res