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There's not really any good reason to store an empty advice string in an advice stash, but it's entirely possible that some people might do it by accident. If they do that without this fix, restarting the system will result in failure while reloading pg_stash_advice.tsv. The root cause is that I (rhaas) did not think clearly enough when defining pgsa_next_tsv_field(). After returning each field on the line, it set *cursor to the start of the next field, and after returning all of them, it set *cursor to the trailing NUL byte. But when the last field on the line is empty, this is ambiguous: if we're pointing at the trailing NUL byte, it could be either because it's the start of the zero-length field or because we're out of fields. To remove the ambiguity, this commit decides that *cursor will instead be set to NULL when there are no more fields. Reported-by: Noah Misch <noah@leadboat.com> Discussion: https://postgr.es/m/20260827171830.68.noahmisch@microsoft.com Backpatch-through: 19
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.