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information_schema output columns that are declared as being type sql_identifier are supposed to conform to the implementation's rules for valid identifiers, in particular the identifier length limit. Several places potentially violated this limit by concatenating a function's name and OID. (The OID is added to ensure name uniqueness within a schema, since the spec doesn't expect function name overloading.) Simply truncating the concatenation result to fit in "name" won't do, since losing part of the OID might wind up giving non-unique results. Instead, let's truncate the function name as necessary. The most practical way to do that is to do it in a C function; the information_schema.sql script doesn't have easy access to the value of NAMEDATALEN, nor does it have an easy way to truncate on the basis of resulting byte-length rather than number of characters. (There are still a couple of places that cast concatenation results to sql_identifier, but as far as I can see they are guaranteed not to produce over-length strings, at least with the normal value of NAMEDATALEN.) Discussion: https://postgr.es/m/23817.1545283477@sss.pgh.pa.us
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: https://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. 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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.