Add "_" as prefix to avoid name collision
Add "_" as prefix to avoid name collision

We cannot use "GRN_BULK_REWIND(body)" without this change.

kenhys/groonga,kenhys/groonga,hiroyuki-sato/groonga,myokoym/groonga,naoa/groonga,myokoym/groonga,hiroyuki-sato/groonga,komainu8/groonga,cosmo0920/groonga,redfigure/groonga,cosmo0920/groonga,komainu8/groonga,groonga/groonga,redfigure/groonga,groonga/groonga,groonga/groonga,naoa/groonga,komainu8/groonga,hiroyuki-sato/groonga,naoa/groonga,kenhys/groonga,komainu8/groonga,groonga/groonga,komainu8/groonga,kenhys/groonga,hiroyuki-sato/groonga,cosmo0920/groonga,myokoym/groonga,komainu8/groonga,redfigure/groonga,redfigure/groonga,groonga/groonga,naoa/groonga,myokoym/groonga,myokoym/groonga,naoa/groonga,redfigure/groonga,hiroyuki-sato/groonga,naoa/groonga,myokoym/groonga,cosmo0920/groonga,cosmo0920/groonga,komainu8/groonga,myokoym/groonga,kenhys/groonga,redfigure/groonga,hiroyuki-sato/groonga,hiroyuki-sato/groonga,kenhys/groonga,groonga/groonga,hiroyuki-sato/groonga,cosmo0920/groonga,myokoym/groonga,redfigure/groonga,komainu8/groonga,redfigure/groonga,cosmo0920/groonga,naoa/groonga,kenhys/groonga,kenhys/groonga,naoa/groonga,groonga/groonga,groonga/groonga,cosmo0920/groonga