Expose BufferUsageAccumDiff().
Previously pg_stat_statements calculated the difference of buffer counters
by its own code even while BufferUsageAccumDiff() had the same code.
This commit expose BufferUsageAccumDiff() and makes pg_stat_statements
use it for the calculation, in order to simply the code.
This change also would be useful for the upcoming patch for the planning
counters in pg_stat_statements because the patch will add one more code
for the calculation of difference of buffer counters and that can easily be
done by using BufferUsageAccumDiff().
Author: Julien Rouhaud
Reviewed-by: Fujii Masao
Discussion: https://postgr.es/m/bdfee4e0-a304-2498-8da5-3cb52c0a193e@oss.nttdata.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/4a539a25ebfc48329fd656a95f3c1eb2cda38af3
Modified Files
--------------
contrib/pg_stat_statements/pg_stat_statements.c | 26 ++-----------------------
src/backend/executor/instrument.c | 4 +---
src/include/executor/instrument.h | 2 ++
3 files changed, 5 insertions(+), 27 deletions(-)