Vary the value size for the scan and get benchmarks.
Vary the value size for the scan and get benchmarks.

We now benchmark 8-byte, 64-byte and 512-byte value sizes. Previously we
only benchmarked 1KB values which was a bit unrealistic given the size
of columns that will typically be stored.

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