Fix assertion failure in pg_prewarm() on objects without storage.
An assertion test added in commit 049ef33 could fail when pg_prewarm()
was called on objects without storage, such as partitioned tables.
This resulted in the following failure in assert-enabled builds:
Failed Assert("RelFileNumberIsValid(rlocator.relNumber)")
Note that, in non-assert builds, pg_prewarm() just failed with an error
in that case, so there was no ill effect in practice.
This commit fixes the issue by having pg_prewarm() raise an error early
if the specified object has no storage. This approach is similar to
the fix in commit 4623d7144 for pg_freespacemap.
Back-patched to v17, where the issue was introduced.
Author: Masahiro Ikeda <ikedamsh@oss.nttdata.com>
Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com>
Reviewed-by: Richard Guo <guofenglinux@gmail.com>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/e082e6027610fd0a4091ae6d033aa117@oss.nttdata.com
Backpatch-through: 17
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/3c4d7557e03ba1ca988a2d1a2518a4ad93976f86
Modified Files
--------------
contrib/pg_prewarm/Makefile | 2 ++
contrib/pg_prewarm/expected/pg_prewarm.out | 10 ++++++++++
contrib/pg_prewarm/meson.build | 5 +++++
contrib/pg_prewarm/pg_prewarm.c | 8 ++++++++
contrib/pg_prewarm/sql/pg_prewarm.sql | 10 ++++++++++
5 files changed, 35 insertions(+)
