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When building a ForeignPath for a joinrel, if there's a possibility that EvalPlanQual will be executed, we must identify a suitable path for EPQ checks. If the outer or inner path of the chosen path is a ForeignPath representing a pushed-down join, we replace it with its fdw_outerpath to ensure that the EPQ check path consists entirely of local joins. If the chosen path is a MergePath, and its outer or inner path is a ForeignPath that is not already well enough ordered, the MergePath will have non-NIL outersortkeys or innersortkeys indicating the desired ordering to be created by an explicit Sort node. If we then replace the outer or inner path with its corresponding fdw_outerpath, and that path is already sufficiently ordered, we end up in an inconsistent state: the MergePath has non-NIL outersortkeys or innersortkeys, and its input path is already properly ordered. This inconsistency can result in an Assert failure or the addition of a redundant Sort node. To fix, check if the new outer or inner path of a MergePath is already properly sorted, and set its outersortkeys or innersortkeys to NIL if so. Bug: #18902 Reported-by: Nikita Kalinin <n.kalinin@postgrespro.ru> Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Tender Wang <tndrwang@gmail.com> Discussion: https://postgr.es/m/18902-71c1bed2b9f7c46f@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.