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 ------ master Details ------- http://git.postgresql.org/pg/commitdiff/0f39d5050dc0dce99258381f33f1832c437aff85 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 | 1 + 5 files changed, 15 insertions(+), 4 deletions(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
