Обсуждение: pgsql: Ensure we allocate NAMEDATALEN bytes for names in Index Only Sca

Ensure we allocate NAMEDATALEN bytes for names in Index Only Scans

As an optimization, we store "name" columns as cstrings in btree
indexes.

Here we modify it so that Index Only Scans convert these cstrings back
to names with NAMEDATALEN bytes rather than storing the cstring in the
tuple slot, as was happening previously.

Bug: #17855
Reported-by: Alexander Lakhin
Reviewed-by: Alexander Lakhin, Tom Lane
Discussion: https://postgr.es/m/17855-5f523e0f9769a566@postgresql.org
Backpatch-through: 12, all supported versions

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/68d358545037c51723a7ff0ab96f489e066a6fdd

Modified Files
--------------
src/backend/executor/nodeIndexonlyscan.c      | 95 +++++++++++++++++++++++++--
src/include/catalog/pg_opclass.dat            |  7 +-
src/include/nodes/execnodes.h                 |  4 ++
src/test/regress/expected/index_including.out | 25 +++++++
src/test/regress/sql/index_including.sql      | 19 ++++++
5 files changed, 141 insertions(+), 9 deletions(-)