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authorTomas Vondra <tomas.vondra@postgresql.org>2021-09-20 00:34:57 +0200
committerTomas Vondra <tomas.vondra@postgresql.org>2021-09-20 00:34:57 +0200
commitc9eeef2a15c02ff7dd2bf3251dbee925b050fc0f (patch)
tree52e6559cacf62a8e13636f67d3bb16199d453872 /src/backend/access/gist/gistvalidate.c
parentd5eeb51bc053d75f647136026de522d6ee3bf725 (diff)
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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
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