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(parent: 18f791a) | patch
Replace binary search in fmgr_isbuiltin with a lookup array.
authorAndres Freund <andres@anarazel.de>
Wed, 4 Oct 2017 07:22:38 +0000 (00:22 -0700)
committerAndres Freund <andres@anarazel.de>
Wed, 4 Oct 2017 07:22:38 +0000 (00:22 -0700)
commit212e6f34d55c910505f87438d878698223d9a617
treed4901af435b9ffe5c41aad37608767dc5c7dc422tree | snapshot
parent18f791ab2b6a01a632653d394e046f3daf193ff6commit | diff
Replace binary search in fmgr_isbuiltin with a lookup array.

Turns out we have enough functions that the binary search is quite
noticeable in profiles.

Thus have Gen_fmgrtab.pl build a new mapping from a builtin function's
oid to an index in the existing fmgr_builtins array. That keeps the
additional memory usage at a reasonable amount.

Author: Andres Freund, with input from Tom Lane
Discussion: https://postgr.es/m/20170914065128.a5sk7z4xde5uy3ei@alap3.anarazel.de
src/backend/utils/Gen_fmgrtab.pl diff | blob | history
src/backend/utils/Makefile diff | blob | history
src/backend/utils/fmgr/fmgr.c diff | blob | history
src/include/utils/fmgrtab.h diff | blob | history
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