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There have never been any regression tests in PGSS for various query patterns for nested queries combined with level tracking, like: - Multi-statements. - CREATE TABLE AS - CREATE/REFRESH MATERIALIZED VIEW - DECLARE CURSOR - EXPLAIN, with a subset of the above supported. - COPY. All the tests added here track historical, sometimes confusing, existing behaviors. For example, EXPLAIN stores two PGSS entries with the same top-level query string but two different query IDs as one is calculated for the top-level EXPLAIN (this part is right) and a second one for the inner query in the EXPLAIN (this part is not right). A couple of patches are under discussion to improve the situation, and all the tests added here will prove useful to evaluate the changes discussed. Author: Anthonin Bonnefoy Reviewed-by: Michael Paquier, Jian He Discussion: https://postgr.es/m/CAO6_XqqM6S9bQ2qd=75W+yKATwoazxSNhv5sjW06fjGAtHbTUA@mail.gmail.com
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.