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As previously-added tests demonstrated, heap_inplace_update() could instead update an unrelated tuple of the same catalog. It could lose the update. Losing relhasindex=t was a source of index corruption. Inplace-updating commands like VACUUM will now wait for heap_update() commands like GRANT TABLE and GRANT DATABASE. That isn't ideal, but a long-running GRANT already hurts VACUUM progress more just by keeping an XID running. The VACUUM will behave like a DELETE or UPDATE waiting for the uncommitted change. For implementation details, start at the systable_inplace_update_begin() header comment and README.tuplock. Back-patch to v12 (all supported versions). In back branches, retain a deprecated heap_inplace_update(), for extensions. Reported by Smolkin Grigory. Reviewed by Nitin Motiani, (in earlier versions) Heikki Linnakangas, and (in earlier versions) Alexander Lakhin. Discussion: https://postgr.es/m/CAMp+ueZQz3yDk7qg42hk6-9gxniYbp-=bG2mgqecErqR5gGGOA@mail.gmail.com
Test extensions and libraries ============================= src/test/modules contains PostgreSQL extensions that are primarily or entirely intended for testing PostgreSQL and/or to serve as example code. The extensions here aren't intended to be installed in a production server and aren't suitable for "real work". Furthermore, while you can do "make install" and "make installcheck" in this directory or its children, it is NOT ADVISABLE to do so with a server containing valuable data. Some of these tests may have undesirable side-effects on roles or other global objects within the tested server. "make installcheck-world" at the top level does not recurse into this directory. Most extensions have their own pg_regress tests or isolationtester specs. Some are also used by tests elsewhere in the tree. If you're adding new hooks or other functionality exposed as C-level API this is where to add the tests for it.