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0a14bca662
a316a3bc fixed the code in build_simpl_rel() that propagates RelOptInfo.userid from parent to child rels so that it works correctly for the child rels of a UNION ALL subquery rel, though no tests were added in that commit. So do so here. As noted in the discussion, coming up with a test case in the core regression suite for this fix has turned out to be tricky, so the test case is added to the postgres_fdw's suite instead. postgresGetForeignRelSize()'s use of user mapping for the user specified in RelOptInfo.userid makes it relatively easier to craft a test case around. Discussion: https://postgr.es/m/CA%2BHiwqH91GaFNXcXbLAM9L%3DzBwUmSyv699Mtv3i1_xtk9Xec_A%40mail.gmail.com Backpatch-through: 16
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.