SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function toDateTime64 (alias dt64) (children 1)
     ExpressionList (children 3)
      Literal \'2021-08-15 18:57:56.492\'
      Literal UInt64_3
      Literal \'Asia/Shanghai\'
   ExpressionList (children 3)
    Identifier dt64
    Function dateTime64ToSnowflake (children 1)
     ExpressionList (children 1)
      Identifier dt64
    Function materialize (children 1)
     ExpressionList (children 1)
      Function dateTime64ToSnowflake (children 1)
       ExpressionList (children 1)
        Identifier dt64