Thread: pgsql: Fix handling of empty uncompressed posting list pages in GIN
Fix handling of empty uncompressed posting list pages in GIN PostgreSQL 9.4 introduces posting list compression in GIN. This feature supports online upgrade, so that after pg_upgrade uncompressed posting lists are compressed on-the-fly. Underlying code appears to always expect at least one item on uncompressed posting list page. But there could be completely empty pages, because VACUUM never deletes leftmost and rightmost pages from posting trees. This commit fixes that. Reported-by: Sivasubramanian Ramasubramanian Discussion: https://postgr.es/m/1531867212836.63354%40amazon.com Author: Sivasubramanian Ramasubramanian, Alexander Korotkov Backpatch-through: 9.4 Branch ------ REL9_5_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/3c09b032afe548a4f0c3fd0658957650c3e22832 Modified Files -------------- src/backend/access/gin/gindatapage.c | 20 ++++++++++++-------- src/backend/access/gin/ginxlog.c | 27 +++++++++++++++++++++------ 2 files changed, 33 insertions(+), 14 deletions(-)