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The "BuiltIn_Reduce_Functions" page has been changed by SebastianCohnen.
The comment on this change is: wasn't finished yet :).
http://wiki.apache.org/couchdb/BuiltIn_Reduce_Functions?action=diff&rev1=1&rev2=2

{"update_seq":6,"rows":[
{"key":null,"value":{"sum":2,"count":2,"min":1,"max":1,"sumsqr":2}}
]}

 {{{sum}}} and {{{count}}} is the equiverlent to {{{_sum}}} and {{{_count}}}. {{{min}}} and
{{{max}}} are the minimum and maximum values of the emitted values.
}}}
+ {{{sum}}} and {{{count}}} is the equiverlent to {{{_sum}}} and {{{_count}}}. {{{min}}} and
{{{max}}} are the minimum and maximum values of the emitted values. {{{sumsqr}}} is the sum
over all square roots of the emitted values (useful for statistics calculations).
+
