future-util: implement range-based map_reduce() variant
future-util: implement range-based map_reduce() variant

kjniemi/seastar,tempbottle/seastar,stamhe/seastar,senseb/scylla,scylladb/seastar,scylladb/scylla-seastar,respu/scylla,eklitzke/scylla,bzero/seastar,duarten/scylla,justintung/scylla,chunshengster/seastar,anzihenry/seastar,senseb/scylla,koolhazz/seastar,tempbottle/seastar,wildinto/seastar,jonathanleang/seastar,bowlofstew/seastar,scylladb/scylla,stamhe/scylla,avikivity/scylla,linearregression/scylla,phonkee/scylla,syuu1228/seastar,dreamsxin/seastar,asias/scylla,norcimo5/seastar,aruanruan/scylla,linearregression/seastar,kjniemi/scylla,bowlofstew/seastar,leejir/seastar,avikivity/scylla,cloudius-systems/seastar,respu/scylla,shaunstanislaus/scylla,xtao/seastar,glommer/scylla,scylladb/seastar,justintung/scylla,acbellini/scylla,koolhazz/seastar,xtao/seastar,rentongzhang/scylla,mixja/seastar,scylladb/scylla-seastar,scylladb/scylla,asias/scylla,dwdm/scylla,avikivity/scylla,asias/scylla,hongliangzhao/seastar,senseb/scylla,tempbottle/scylla,kjniemi/seastar,eklitzke/scylla,jonathanleang/seastar,gwicke/scylla,acbellini/seastar,glommer/scylla,duarten/scylla,avikivity/seastar,kjniemi/seastar,flashbuckets/seastar,capturePointer/scylla,bowlofstew/seastar,bowlofstew/scylla,jonathanleang/seastar,koolhazz/seastar,printedheart/seastar,scylladb/scylla,eklitzke/scylla,kangkot/scylla,mixja/seastar,joerg84/seastar,acbellini/scylla,phonkee/scylla,dwdm/scylla,raphaelsc/scylla,scylladb/scylla-seastar,guiquanz/scylla,guiquanz/scylla,dwdm/scylla,bowlofstew/scylla,justintung/scylla,rentongzhang/scylla,glommer/scylla,tempbottle/scylla,phonkee/scylla,victorbriz/scylla,stamhe/scylla,dwdm/seastar,cloudius-systems/seastar,victorbriz/scylla,joerg84/seastar,sjperkins/seastar,dreamsxin/seastar,chunshengster/seastar,kangkot/scylla,linearregression/scylla,anzihenry/seastar,acbellini/scylla,acbellini/seastar,syuu1228/seastar,bowlofstew/scylla,kjniemi/scylla,shyamalschandra/seastar,raphaelsc/scylla,norcimo5/seastar,wildinto/seastar,linearregression/scylla,rluta/scylla,gwicke/scylla,printedheart/seastar,tempbottle/scylla,scylladb/scylla,guiquanz/scylla,leejir/seastar,shaunstanislaus/scylla,shaunstanislaus/scylla,dreamsxin/seastar,wildinto/scylla,kangkot/scylla,wildinto/seastar,avikivity/seastar,raphaelsc/scylla,victorbriz/scylla,linearregression/seastar,aruanruan/scylla,cloudius-systems/seastar,stamhe/seastar,linearregression/seastar,dwdm/seastar,joerg84/seastar,duarten/scylla,chunshengster/seastar,hongliangzhao/seastar,shyamalschandra/seastar,leejir/seastar,gwicke/scylla,anzihenry/seastar,capturePointer/scylla,tempbottle/seastar,scylladb/seastar,rentongzhang/scylla,acbellini/seastar,flashbuckets/seastar,norcimo5/seastar,syuu1228/seastar,hongliangzhao/seastar,respu/scylla,aruanruan/scylla,avikivity/seastar,xtao/seastar,wildinto/scylla,flashbuckets/seastar,sjperkins/seastar,stamhe/scylla,capturePointer/scylla,wildinto/scylla,stamhe/seastar,kjniemi/scylla,dwdm/seastar,rluta/scylla,printedheart/seastar,mixja/seastar,rluta/scylla,sjperkins/seastar,shyamalschandra/seastar,bzero/seastar,bzero/seastar