cql3: convert maps::discarder_by_key to C++
cql3: convert maps::discarder_by_key to C++

kjniemi/scylla,shaunstanislaus/scylla,wildinto/scylla,bowlofstew/scylla,guiquanz/scylla,gwicke/scylla,scylladb/scylla,guiquanz/scylla,linearregression/scylla,aruanruan/scylla,duarten/scylla,senseb/scylla,justintung/scylla,linearregression/scylla,wildinto/scylla,gwicke/scylla,avikivity/scylla,dwdm/scylla,respu/scylla,kjniemi/scylla,victorbriz/scylla,scylladb/scylla,raphaelsc/scylla,rentongzhang/scylla,duarten/scylla,eklitzke/scylla,rluta/scylla,raphaelsc/scylla,eklitzke/scylla,shaunstanislaus/scylla,tempbottle/scylla,asias/scylla,tempbottle/scylla,gwicke/scylla,raphaelsc/scylla,glommer/scylla,capturePointer/scylla,aruanruan/scylla,victorbriz/scylla,eklitzke/scylla,stamhe/scylla,stamhe/scylla,senseb/scylla,duarten/scylla,asias/scylla,shaunstanislaus/scylla,acbellini/scylla,justintung/scylla,glommer/scylla,guiquanz/scylla,kangkot/scylla,linearregression/scylla,capturePointer/scylla,rentongzhang/scylla,kangkot/scylla,kangkot/scylla,respu/scylla,avikivity/scylla,avikivity/scylla,rentongzhang/scylla,dwdm/scylla,acbellini/scylla,rluta/scylla,dwdm/scylla,bowlofstew/scylla,wildinto/scylla,glommer/scylla,acbellini/scylla,kjniemi/scylla,phonkee/scylla,capturePointer/scylla,phonkee/scylla,bowlofstew/scylla,victorbriz/scylla,rluta/scylla,justintung/scylla,scylladb/scylla,respu/scylla,scylladb/scylla,senseb/scylla,aruanruan/scylla,stamhe/scylla,phonkee/scylla,tempbottle/scylla,asias/scylla