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This commit adds XML_PARSE_HUGE to the libxml2 functions used in core for the parsing of XML objects, raising up the original limit of 10MB supported by libxml2. In most code paths of upstream, XML_MAX_TEXT_LENGTH (10^7) is the historical limit that gets upgraded to XML_MAX_HUGE_LENGTH (10^9) once XML_PARSE_HUGE is given to the parser calls. These are still limited by any palloc() calls for text, up to 1GB. This offers the possibility to handle within the backend XML objects larger than 10MB in general, with also a higher depth limit. This change affects the contrib module xml2, the xml data type and SQL/XML. Author: Dmitry Koval Reviewed-by: Tom Lane, Michael Paquier Discussion: https://postgr.es/m/18274-98d16bc03520665f@postgresql.org
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.