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It's actually more useful for the module to ignore these. Ignoring EXECUTE (and not incrementing the nesting level) allows the executor hooks to charge the time to the underlying prepared query, which shows up as a stats entry with the original PREPARE as query string (possibly modified by suppression of constants, which might not be terribly useful here but it's not worth avoiding). This is much more useful than cluttering the stats table with a distinct entry for each textually distinct EXECUTE. Experimentation with this idea shows that it's also preferable to ignore PREPARE. If we don't, we get two stats table entries, one with the query string hash and one with the jumble-derived hash, but with the same visible query string (modulo those constants). This is confusing and not very helpful, since the first entry will only receive costs associated with initial planning of the query, which is not something counted at all normally by pg_stat_statements. (And if we do start tracking planning costs, we'd want them blamed on the other hash table entry anyway.)
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.