mirror of https://github.com/postgres/postgres
128dd9f9ec
As it stands, flagInhAttrs() can make changes in table properties that change decisions made at other tables during other iterations of its loop. This is a pretty bad idea, since we visit the tables in OID order which is not necessarily related to inheritance relationships. So far as I can tell, the consequences are just cosmetic: we might dump DEFAULT or GENERATED expressions that we don't really need to because they match properties of the parent. Nonetheless, it's buggy, and somebody might someday add functionality here that fails less benignly when the traversal order varies. One issue is that when we decide we needn't dump a particular GENERATED expression, we physically unlink the struct for it, so that it will now look like the table has no such expression, causing the wrong choice to be made at any child visited later. We can improve that by instead clearing the dobj.dump flag, and taking care to check that flag when it comes time to dump the expression or not. The other problem is that if we decide we need to fake up a DEFAULT NULL clause to override a default that would otherwise get inherited, we modify the data structure in the reverse fashion, creating an attrdefs entry where there hadn't been one. It's harder to avoid doing that, but since the backend won't report a plain "DEFAULT NULL" property we can modify the code to recognize ones we just added. Add some commentary to perhaps forestall future mistakes of the same ilk. Since the effects of this seem only cosmetic, no back-patch. Discussion: https://postgr.es/m/1506298.1676323579@sss.pgh.pa.us |
||
|---|---|---|
| config | ||
| contrib | ||
| doc | ||
| src | ||
| .cirrus.yml | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .git-blame-ignore-revs | ||
| .gitattributes | ||
| .gitignore | ||
| COPYRIGHT | ||
| GNUmakefile.in | ||
| HISTORY | ||
| Makefile | ||
| README | ||
| README.git | ||
| aclocal.m4 | ||
| configure | ||
| configure.ac | ||
| meson.build | ||
| meson_options.txt | ||
README
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/.