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
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REL_15_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/75f323aa1c1ec88f9781cb6d9307e42b820b26f0
Modified Files
--------------
src/backend/access/common/heaptuple.c | 90 ++++++++++++++++++++++++++++++++++-
src/tools/pgindent/typedefs.list | 1 +
2 files changed, 90 insertions(+), 1 deletion(-)
