cql: make function_name more similar to origin
cql: make function_name more similar to origin

- make members const
- drop overeager assert

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