mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-09 08:10:09 +08:00
2d04277121
When the ability to print variable-length-array fields was first added to outfuncs.c, there was no corresponding read capability, as it was used only for debug dumps of planner-internal Nodes. Not a lot of thought seems to have been put into the output format: it's just the space-separated array elements and nothing else. Later such fields appeared in Plan nodes, and still later we grew read support so that Plans could be transferred to parallel workers, but the original text format wasn't rethought. It seems inadequate to me because (a) no cross-check is possible that we got the right number of array entries, (b) we can't tell the difference between a NULL pointer and a zero-length array, and (c) except for WRITE_INDEX_ARRAY, we'd crash if a non-zero length is specified when the pointer is NULL, a situation that can arise in some fields that we currently conveniently avoid printing. Since we're currently in a campaign to make the Node infrastructure generally more it-just-works-without-thinking-about-it, now seems like a good time to improve this. Let's adopt a format similar to that used for Lists, that is "<>" for a NULL pointer or "(item item item)" otherwise. Also retool the code to not have so many copies of the identical logic. I bumped catversion out of an abundance of caution, although I think that we don't use any such array fields in Nodes that can get into the catalogs. Discussion: https://postgr.es/m/1528424.1658272135@sss.pgh.pa.us |
||
|---|---|---|
| config | ||
| contrib | ||
| doc | ||
| src | ||
| .cirrus.yml | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .git-blame-ignore-revs | ||
| .gitattributes | ||
| .gitignore | ||
| aclocal.m4 | ||
| configure | ||
| configure.ac | ||
| COPYRIGHT | ||
| GNUmakefile.in | ||
| HISTORY | ||
| Makefile | ||
| README | ||
| README.git | ||
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/.