Thread: pgsql: Skip system attributes when applying mvdistinct stats
Skip system attributes when applying mvdistinct stats When estimating number of distinct groups, we failed to ignore system attributes when matching the group expressions to mvdistinct stats, causing failures like ERROR: negative bitmapset member not allowed Fix that by simply skipping anything that is not a regular attribute. Backpatch to PostgreSQL 10, where the extended stats were introduced. Bug: #16111 Reported-by: Tuomas Leikola Author: Tomas Vondra Backpatch-through: 10 Discussion: https://postgr.es/m/16111-687799584c3a7e73@postgresql.org Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/d482f7f867b58bbd29f65a4471eca8c5b57a7da0 Modified Files -------------- src/backend/utils/adt/selfuncs.c | 19 ++++++++++++++----- src/test/regress/expected/stats_ext.out | 7 +++++++ src/test/regress/sql/stats_ext.sql | 3 +++ 3 files changed, 24 insertions(+), 5 deletions(-)