Fix nbtree backward scan race condition comments. Remove comments that supposed that holding a pin was a useful interlock for _bt_walk_left(). There are times when _bt_walk_left() doesn't hold either a lock or a pin on any page, so clearly this can't be true. _bt_walk_left() is even prepared to deal with concurrent deletion of both the original page and any pages to its left.
Oversight in commit 2ed5b87f96. Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/aa210e0c121eb8f58c86d4fcc833a5a6fbb6f5a9 Modified Files -------------- src/backend/access/nbtree/nbtsearch.c | 27 ++++++++------------------- 1 file changed, 8 insertions(+), 19 deletions(-)
