Don't trust deferred-unique indexes for join removal. The uniqueness condition might fail to hold intra-transaction, and assuming it does can give incorrect query results. Per report from Marti Raudsepp, though this is not his proposed patch.
Back-patch to 9.0, where both these features were introduced. In the released branches, add the new IndexOptInfo field to the end of the struct, to try to minimize ABI breakage for third-party code that may be examining that struct. Branch ------ REL9_0_STABLE Details ------- http://git.postgresql.org/pg/commitdiff/9fbb3edff085f2f004c24b988b43c7cd4f132e2f Modified Files -------------- src/backend/nodes/outfuncs.c | 1 + src/backend/optimizer/path/indxpath.c | 7 ++++--- src/backend/optimizer/util/plancat.c | 6 ++++++ src/backend/utils/adt/selfuncs.c | 4 +++- src/include/nodes/relation.h | 2 ++ 5 files changed, 16 insertions(+), 4 deletions(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
