Compute differences between succesive records in Hadoop with Hive Queries

It's an old question, but for future references, I write here another proposition:

Hive Windowing functions allows to use previous / next values in your query.

A similar code query may be :

SELECT customer_id, call_time - LAG(call_time, 1, 0) OVER (PARTITION BY customer_id ORDER BY call_time) FROM mytable;