Disallow extended statistics on system columns
Since introduction of extended statistics, we've disallowed references
to system columns. So for example
CREATE STATISTICS s ON ctid FROM t;
would fail. But with extended statistics on expressions, it was possible
to work around this limitation quite easily
CREATE STATISTICS s ON (ctid::text) FROM t;
This is an oversight in a4d75c86bf, fixed by adding a simple check.
Backpatch to PostgreSQL 14, where support for extended statistics on
expressions was introduced.
Backpatch-through: 14
Discussion: https://postgr.es/m/20210816013255.GS10479%40telsasoft.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/c9eeef2a15c02ff7dd2bf3251dbee925b050fc0f
Modified Files
--------------
src/backend/commands/statscmds.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
