How to convert a string to timestamp with milliseconds in Hive

Question

I have a string \'20141014123456789\' which represents a timestamp with milliseconds that I need to convert to a timestamp in Hive (0.13.0) without losing the milliseconds.

Answer 1

I found a way to avoid the messy concatenation of substrings using the following code:

select cast(regexp_replace('20141014123456789', 
                           '(\\d{4})(\\d{2})(\\d{2})(\\d{2})(\\d{2})(\\d{2})(\\d{3})',
                           '$1-$2-$3 $4:$5:$6.$7') as timestamp)