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The query to get attribute statistics from a remote server applied the "C" collation to a column of type name without checking the server's version. Since the name type was made collatable in Postgres 12, this could break attribute statistics import if the server was older. Fix by casting the column value to text before collating it if the server is older. Also, fix a typo in the if-test in the same function. Oversights in commit 28972b6fc; the former was reported by Fujii Masao. Reported-by: Fujii Masao <masao.fujii@gmail.com> Author: Etsuro Fujita <etsuro.fujita@gmail.com> Reviewed-by: Corey Huinker <corey.huinker@gmail.com> Discussion: https://postgr.es/m/CAHGQGwGvA_3q7Wg7GXQkuugGZj3%3DkxDRjDsKgVvK1uwAxHTopQ%40mail.gmail.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.