Copy-on-write for BatchRequest
Copy-on-write for BatchRequest

This removes one location in the code in which we
modified data in the incoming request which could
possibly be used concurrently without our knowledge.

This change makes sure that we shallow-copy just
enough to rewrite into our own personal copies.

il9ue/cockroach,glycerine/cockroach,vivekmenezes/cockroach,vaibhavarora/cockroach,nieyy/cockroach,sunya123/cockroach,veteranlu/cockroach,cockroachdb/cockroach,nieyy/cockroach,sunya123/cockroach,cockroachdb/cockroach,paperstreet/cockroach,maxlang/cockroach,petermattis/cockroach,cuongdo/cockroach,cuongdo/cockroach,vaibhavarora/cockroach,vivekmenezes/cockroach,il9ue/cockroach,glycerine/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,maxlang/cockroach,cuongdo/cockroach,arjun4084346/cockroach,arjun4084346/cockroach,vaibhavarora/cockroach,veteranlu/cockroach,veteranlu/cockroach,petermattis/cockroach,il9ue/cockroach,vivekmenezes/cockroach,arjun4084346/cockroach,cockroachdb/cockroach,il9ue/cockroach,sunya123/cockroach,vaibhavarora/cockroach,vivekmenezes/cockroach,vivekmenezes/cockroach,paperstreet/cockroach,cuongdo/cockroach,veteranlu/cockroach,petermattis/cockroach,glycerine/cockroach,cockroachdb/cockroach,paperstreet/cockroach,maxlang/cockroach,veteranlu/cockroach,nieyy/cockroach,glycerine/cockroach,cuongdo/cockroach,sunya123/cockroach,bg451/cockroach,vivekmenezes/cockroach,bg451/cockroach,cockroachdb/cockroach,paperstreet/cockroach,petermattis/cockroach,maxlang/cockroach,arjun4084346/cockroach,petermattis/cockroach,il9ue/cockroach,cuongdo/cockroach,bg451/cockroach,vivekmenezes/cockroach,nieyy/cockroach,il9ue/cockroach,il9ue/cockroach,sunya123/cockroach,paperstreet/cockroach,nieyy/cockroach,cockroachdb/cockroach,bg451/cockroach,cockroachdb/cockroach,petermattis/cockroach,glycerine/cockroach,sunya123/cockroach,arjun4084346/cockroach,cockroachdb/cockroach,glycerine/cockroach,vaibhavarora/cockroach,glycerine/cockroach,bg451/cockroach,maxlang/cockroach,glycerine/cockroach,bg451/cockroach,petermattis/cockroach,bg451/cockroach,paperstreet/cockroach,maxlang/cockroach,veteranlu/cockroach,sunya123/cockroach,nieyy/cockroach,vivekmenezes/cockroach,cuongdo/cockroach,cuongdo/cockroach,arjun4084346/cockroach,sunya123/cockroach,maxlang/cockroach,arjun4084346/cockroach,maxlang/cockroach,veteranlu/cockroach,nieyy/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,nieyy/cockroach,paperstreet/cockroach,petermattis/cockroach,vaibhavarora/cockroach,veteranlu/cockroach,il9ue/cockroach