Hello @Arsalan Siddiqi I think it's possible with NiFi 1.2.0 or later, by using QueryRecord processor. The basic idea is using MergeContent to create a single FlowFile, containing all CSV files, when doing so, add a column specifying which attribute (I used 'm' column in my example). Then use QueryRecord processor to join records and produce a row having different attributes in it: select fa.t, fa.v a, fb.v b, fc.v c
from (
select t, v from FLOWFILE where m = 'a'
) fa
left join (
select t, v from FLOWFILE where m = 'b'
) fb on fa.t = fb.t
left join (
select t, v from FLOWFILE where m = 'c'
) fc on fa.t = fc.t I've created a Gist with NiFi flow template, I hope this helps: https://gist.github.com/ijokarumawak/7e20af1cd222fb2adf13acb2b0f46aed
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