Hi all -

This seems like it should be easy, but for some reason i have thought
myself into a box on this and now am stuck.

I have a data set of rows/ columns that has some hierarchical data in
it:


COLUMN  A       B       C

        A1      B1      C1
        A1      B1      C2
        A1      B2      C3
        A1      B2      C4
        A2      B3      C5
        A2      B3      C6
        A2      B4      C7
        A2      B4      C8

and i want to convert this to a nested map structure:
[
        {:data A1
        :children  [{:data B1 :children [{:data C1} {:data C2}]]}
                   {:data B2 :children [{:data C3} {:data C4}]]}

        {:data A2
        :children  [{:data B3 :children [{:data C5} {:data C6}]]}
                   {:data B4 :children [{:data C7} {:data C8}]]} ]

I have tried various methods and have frustrated myself to no end.
Any help on this would be most greatly appreciated.

3 additional notes:
1. It would be really awesome if i could somehow specify the
hierarchical structure so that I can reuse this (as i will have to)
2. I will be using this on some fairly large data sets (the largest is
maybe 50K records).
3.  I think that the largest number of nodes in the tree will be 3,
but this *could* change in the future.

As always, any help is most appreciated.

Thanks

Base

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