How to convert Java timestamp stored as bigint to timestamp in Presto?

Question

I\'ve had little luck searching for this over a couple days.

If my avro schema for data in a hive table is:

{
  \"type\" : \"record\",
  \"name\" : \         


        

Answer 1

select from_unixtime(cast(event_time as bigint) / 1000000) + parse_duration(cast((cast(event_time as bigint) % 1000) as varchar) || 'ms') from TableName limit 10;

Answer 2

I didn't find direct conversion from Java timestamp (number of milliseconds since 1970) to timestamp, but one can be done with to_unixtime and adding milliseconds as interval:

presto> with t as (select cast('1497435766032' as bigint) a)
     -> select from_unixtime(a / 1000) + parse_duration(cast((a % 1000) as varchar) || 'ms') from t;
          _col0          
-------------------------
 2017-06-14 12:22:46.032 
(1 row)

(admittedly cumbersome, but works)