a0ef081720
Historically, psql has truncated the text of a column's default expression at 128 characters. This is unlike any other behavior in describe.c, and it's become particularly confusing now that the limit is only applied to the expression proper and not to the "generated always as (...) stored" text that may get wrapped around it. Excavation in our git history suggests that the original motivation for this limit was not really to limit the display width (as I'd long supposed), but to make it safe to use a fixed-width output buffer to store the result. That implementation restriction is long gone of course, but the limit remained. Let's just get rid of it. While here, rearrange the logic about when to free the output string so that it's not so dependent on unstated assumptions about the possible values of attidentity and attgenerated. Per bug #16743 from David Turon. Back-patch to v12 where GENERATED came in. (Arguably we could take it back further, but I'm hesitant to change the behavior of long-stable branches for this.) Discussion: https://postgr.es/m/16743-7b1bacc4af76e7ad@postgresql.org
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/.