postgresql/doc
Fujii Masao bae42a54e3 doc: Clarify that empty COMMENT string removes the comment.
Clarify the documentation of COMMENT ON to state that specifying an empty
string is treated as NULL, meaning that the comment is removed.

This makes the behavior explicit and avoids possible confusion about how
empty strings are handled.

Also adds regress test cases that use empty string to remove a comment.

Backpatch to all supported versions.

Author: Chao Li <lic@highgo.com>
Reviewed-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Reviewed-by: David G. Johnston <david.g.johnston@gmail.com>
Reviewed-by: Shengbin Zhao <zshengbin91@gmail.com>
Reviewed-by: Jim Jones <jim.jones@uni-muenster.de>
Reviewed-by: zhangqiang <zhang_qiang81@163.com>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/26476097-B1C1-4BA8-AA92-0AD0B8EC7190@gmail.com
Backpatch-through: 14
2026-03-03 14:45:52 +09:00
..
src doc: Clarify that empty COMMENT string removes the comment. 2026-03-03 14:45:52 +09:00
KNOWN_BUGS
Makefile Remove distprep 2023-11-06 15:18:04 +01:00
MISSING_FEATURES
TODO Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00