Thread: pgsql: Cache by-reference missing values in a long lived context
Cache by-reference missing values in a long lived context Attribute missing values might be needed past the lifetime of the tuple descriptors from which they are extracted. To avoid possibly using pointers for by-reference values which might thus be left dangling, we cache a datumCopy'd version of the datum in the TopMemoryContext. Since we first search for the value this only needs to be done once per session for any such value. Original complaint from Tom Lane, idea for mitigation by Andrew Dunstan, tweaked by Tom Lane. Backpatch to version 11 where missing values were introduced. Discussion: https://postgr.es/m/1306569.1687978174@sss.pgh.pa.us Branch ------ REL_16_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/f938acd68b08704a086b5f41eaf1989026d6f013 Modified Files -------------- src/backend/access/common/heaptuple.c | 90 ++++++++++++++++++++++++++++++++++- src/tools/pgindent/typedefs.list | 1 + 2 files changed, 90 insertions(+), 1 deletion(-)