My CSV file is something like the attached file which could have 'n' number 
of line. I need to group by the values in the last column. 
Current I believe the below code will return me a vector of vector. 

(defn read-csv-file

 [path]

 (try

   (with-open [input-file (io/reader path)]

     (let [a_list (doall (map (comp first clojure-csv.core/parse-csv) (line-
seq input-file)))]

       (rest (into [] a_list))))

   (catch Exception exception (throw exception))))


i need to iterate through this vector of vector and create a new vector of 
vector containing only elements of the first group, then in next iteration 
i need the second set and so on. 

Example CSV 

> Heading1 Heading 2 Heading 3 
> abc 123 Value1 
> def 234 Value1 
> ghi dfgew Value1 
> jkl 456 Value5 
> pqr 567 Value5 
> stu 678 value3 
> vwx sdf value4 
> yza 900 value4 



so when this CSV is parsed i will have something like 
[
[abc 123 Value1]
[def 234 Value1]
[ghi dfgew Value1]
[jkl 456 Value5]
[pqr 567 Value5]
[stu 678 value3]
[vwx sdf value4]
[yza 900 value4]]
So when i iterate through this i need to group the vector of vector by the 
last column 
so my first iteration output should be something like 

[
[abc 123 Value1]
[def 234 Value1]
[ghi dfgew Value1]]
2nd iteration should be 
[
[jkl 456 Value5]
[pqr 567 Value5]]
3rd should be 

[
[stu 678 value3]] 
and so on.

How would i achieve this in clojure. is there any build in csv parsing 
function

Regards 
JP



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