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0cf205e122
Fix two issues in parent_key validation in posting trees: * It's not enough to check stack->parentblk is valid to determine if the parentkey is valid. It's possible parentblk is set to a valid block number, but parentkey is invalid. So check parentkey directly. * We don't need to invalidate parentkey for all child pages of the rightmost page. It's enough to invalidate it for the rightmost child only, which means we can check more cases (less false negatives). Issues reported by Arseniy Mukhin, along with a proposed patch. Review by Andrey M. Borodin, cleanup and improvements by me. Author: Arseniy Mukhin <arseniy.mukhin.dev@gmail.com> Reviewed-by: Andrey M. Borodin <x4mmm@yandex-team.ru> Discussion: https://postgr.es/m/CAE7r3MJ611B9TE=YqBBncewp7-k64VWs+sjk7XF6fJUX77uFBA@mail.gmail.com
The PostgreSQL contrib tree
---------------------------
This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree. This does not preclude their
usefulness.
User documentation for each module appears in the main SGML
documentation.
When building from the source distribution, these modules are not
built automatically, unless you build the "world" target. You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.
Some directories supply new user-defined functions, operators, or
types. To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command. In a fresh database,
you can simply do
CREATE EXTENSION module_name;
See the PostgreSQL documentation for more information about this
procedure.