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Pinned topic EXTRACT

‏2012-04-09T14:05:38Z |
Consider there are 2 input files which are fixed length format.There are 2 ids claim and ref id in each file . Need to sum amt field which is second input field in file 2 whose ref id in file 2 matches with ref id in file 1 and also claim id in file 2 matches in claim id in file 1 whose ref id in both files are also similar.

i used an extract function in functional map to sum the values.But it does t show an expected results.Please provide an solution