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Some utility statements contain queries that can be planned and executed: CREATE TABLE AS and DECLARE CURSOR. This commit adds query ID computation for the inner queries executed by these two utility commands, with and without EXPLAIN. This change leads to four new callers of JumbleQuery() and post_parse_analyze_hook() so as extensions can decide what to do with this new data. Previously, extensions relying on the query ID, like pg_stat_statements, were not able to track these nested queries as the query_id was 0. For pg_stat_statements, this commit leads to additions under !toplevel when pg_stat_statements.track is set to "all", as shown in its regression tests. The output of EXPLAIN for these two utilities gains a "Query Identifier" if compute_query_id is enabled. 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.