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23a2b818f5
When replica identity full is being used with a wide tuple (above 2^16 bytes after compression) it lead to errors and/or crashes during decoding because the length field used to store such tuples doesn't fit into the variable used to store the width in the WAL record. To fix, discontinue use of xl_heap_header_len.t_len when decoding the old tuple version, instead compute length of the old tuple by subtracting the new tuple's length from the record length. In newer version of postgres this issue is moot because the length is stored by the new WAL machinery, instead of a xl_heap_header_len struct. A separate commit will forward-patch the regression test. Reported-By: "anderson" Discussion: http://postgr.es/m/20170105144819.f6i5o64vfvy4bn5i@alap3.anarazel.de
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.