Blocker Description
Goal: sum all the values across all columns.
> createtable animal
> deleteiter -n vers -scan -minc -majc
> setiter -t animal -p 10 -scan -n sum -class org.apache.accumulo.core.iterators.user.SummingCombiner
SummingCombiner interprets Values as Longs and adds them together. A variety of encodings (variable length, fixed length, or string) are available
----------> set SummingCombiner parameter all, set to true to apply Combiner to every column, otherwise leave blank. if true, columns option will be ignored.: true
----------> set SummingCombiner parameter columns, <col fam>[:<col qual>]{,<col fam>[:<col qual>]} escape non-alphanum chars using %<hex>.:
----------> set SummingCombiner parameter lossy, if true, failed decodes are ignored. Otherwise combiner will error on failed decodes (default false): <TRUE|FALSE>:
----------> set SummingCombiner parameter type, <VARLEN|FIXEDLEN|STRING|fullClassName>: STRING
> insert mammal cow ellie 1
> insert mammal cow nell 1
> insert mammal man eric 1
> scan
expected: mammal dontcare : dontcare 3
Where "dontcare" can come back with anything; I just don't care.
But I just get this
mammal cow:ellie [] 1 mammal cow:nell [] 1 mammal man:eric [] 1
I can't get the combiner to come back with a sum of mammals or cows.