Обсуждение: pgsql: Fix oversight in outer join removal.
Fix oversight in outer join removal. A placeholder that references the outer join's relid in ph_eval_at is logically "above" the join, and therefore we can't remove its PlaceHolderInfo: it might still be used somewhere in the query. This was not an issue pre-v16 because we failed to remove the join at all in such cases. The new outer-join-aware-Var infrastructure permits deducing that it's okay to remove the join, but then we have to clean up correctly afterwards. Report and fix by Richard Guo Discussion: https://postgr.es/m/CAMbWs4_tuVn9EwwMcggGiZJWWstdXX_ci8FeEU17vs+4nLgw3w@mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/9a2dbc614e6e47da3c49daacec106da32eba9467 Modified Files -------------- src/backend/optimizer/plan/analyzejoins.c | 3 +- src/test/regress/expected/join.out | 57 +++++++++++++++++++++++++++++++ src/test/regress/sql/join.sql | 34 ++++++++++++++++++ 3 files changed, 93 insertions(+), 1 deletion(-)