On Sun, Apr 21, 2019 at 2:01 AM Alexander Korotkov <a.korot...@postgrespro.ru> wrote: > > On Thu, Apr 18, 2019 at 4:09 AM John Naylor <john.nay...@2ndquadrant.com> > wrote: > > I was wondering about that. I measured the current size of > > yy_transition to be 36492 on my machine. With the flag -Cfe, which > > gives the smallest representation without backtracking, yy_nxt is 6336 > > (there is no yy_transition). I'd say that's a large enough difference > > that we'd want the smaller representation if it makes little > > difference in performance. > > Did I understand correctly that you've tried the same version of > jsonpath_scan.l with different flex flags?
Correct. > Did you also notice if > changes 1d88a75c made to jsonpath_scan.l have singnificant influence? Trying the same measurements above with backtracking put back in, jsonpath_yylex was actually larger by a few hundred bytes, and there was almost no difference in the transition/nxt tables. -- John Naylor https://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
