d6dd2a02ba
If a domain type has a default, adding a column of that type (without any explicit DEFAULT clause) failed to install the domain's default value in existing rows, instead leaving the new column null. This is unexpected, and it used to work correctly before v11. The cause is confusion in the atthasmissing mechanism about which default value to install: we'd only consider installing an explicitly-specified default, and then we'd decide that no table rewrite is needed. To fix, take the responsibility for filling attmissingval out of StoreAttrDefault, and instead put it into ATExecAddColumn's existing logic that derives the correct value to fill the new column with. Also, centralize the logic that determines the need for default-related table rewriting there, instead of spreading it over four or five places. In the back branches, we'll leave the attmissingval-filling code in StoreAttrDefault even though it's now dead, for fear that some extension may be depending on that functionality to exist there. A separate HEAD-only patch will clean up the now-useless code. Reported-by: jian he <jian.universality@gmail.com> Author: jian he <jian.universality@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CACJufxHFssPvkP1we7WMhPD_1kwgbG52o=kQgL+TnVoX5LOyCQ@mail.gmail.com Backpatch-through: 13
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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/17/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/17/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.