Adding secondary GROUP-BY to pt-query-digest

Registered by Shlomi Noach on 2013-12-10

I've written a small patch to pt-query-digest suc hthat it accepts secondary group-by. Today, one can add as many group-by to the tool, but these are all flat and do not correlate with one another. The secondary (aka "extra") grou-by is similar to a SQL "GROUP BY primary_attribute, secondary_attribute". Patch provided is against version 2.2.3

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