Presto DB : BIGINT or LONG to TIMESTAMP
Timestamp stored in the hive column UPDT_DT in the table like,
$ presto-cli –catalog hive –schema default
presto:default> select updt_dt from HIVE_SRP_TEST_TBL limit 5;
  updt_dt  Â
—————
1497961733000
1497961733000
1497961733000
1497961733000
1497961733000
(5 rows)
ISSUE : When you simple convert to timestamp, the output would be like,
presto:default> select from_unixtime(updt_dt)updt_dt from HIVE_SRP_TEST_TBL limit 5;
      updt_dt     Â
—————————
+49438-07-09 00:00:00.000
+49438-07-09 00:00:00.000
+49438-07-09 00:00:00.000
+49438-07-09 00:00:00.000
+49438-07-09 00:00:00.000
(5 rows)
Solution :
presto:default> select from_unixtime(updt_dt / 1000) + parse_duration(cast((updt_dt % 1000) as varchar) || ‘ms’) updt_dt fromHIVE_SRP_TEST_TBL limit 5;
     updt_dt     Â
————————-
2017-06-20 12:28:51.000
2017-06-20 12:28:51.000
2017-06-20 12:28:51.000
2017-06-20 12:28:51.000
2017-06-20 12:28:51.000
(5 rows)
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