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From Basanth Gowda <basanth.go...@gmail.com>
Subject Aggregation by key hierarchy
Date Sun, 13 Aug 2017 18:09:14 GMT
I want to aggregate hits by Country, State, City. I would these as tags in
my sample data.

How would I do aggregation at different levels ? Input data would be single

Should I do flatMap transformation first and create 3 records from 1 input
record, or is there a better way to do it ?

thank you,

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