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e13ac5586c
It's possible to begin and end an indexscan without ever calling amrescan. contrib/bloom, unlike every other index AM, allocated its "scan->opaque" storage at amrescan time, and thus would crash in amendscan if amrescan hadn't been called. We could fix this by putting in a null-pointer check in blendscan, but I see no very good reason why contrib/bloom should march to its own drummer in this respect. Let's move that initialization to blbeginscan instead. Per report from Jeff Janes.
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.