CVSROOT: /cvsroot
Module name: pgsql
Changes by: tgl@postgresql.org 01/10/18 12:11:42
Modified files:
src/backend/nodes: print.c
src/backend/optimizer: README
src/backend/optimizer/path: allpaths.c joinrels.c pathkeys.c
src/backend/optimizer/plan: initsplan.c planner.c
src/backend/optimizer/util: relnode.c
src/include/optimizer: paths.h
Log message:
Extend code that deduces implied equality clauses to detect whether a
clause being added to a particular restriction-clause list is redundant
with those already in the list. This avoids useless work at runtime,
and (perhaps more importantly) keeps the selectivity estimation routines
from generating too-small estimates of numbers of output rows.
Also some minor improvements in OPTIMIZER_DEBUG displays.