Given log data, calculate the delta between two lines

[baubakg]

One of the added values for log parsing is to calculate duration.

Given two log data entries

Start time	Action
11:59	start
12:00	finish

I would like to add a calculated delta field, that given a specific order, calculates the delta (of any given calculation) In the case above we will get

Start time	Action	delta
11:59	start	00:01
12:00	finish	0

Open question:

• Maybe an enrich method that adds information.