Partition Hive table by existing field?

Question

Can I partition a Hive table upon insert by an existing field?

I have a 10 GB file with a date field and an hour of day field. Can I load this file into a table, the

Answer 1

I'm not super sure about this, but something like this might work

INSERT OVERWRITE TABLE tealeaf_event
SELECT col1 as tealeaf_col1, ..., datestring as ds;