Disallow whole-row variables in GENERATED expressions.
This was previously allowed, but I think that was just an oversight.
It's a clear violation of the rule that a generated column cannot
depend on itself or other generated columns. Moreover, because the
code was relying on the assumption that no such cross-references
exist, it was pretty easy to crash ALTER TABLE and perhaps other
places. Even if you managed not to crash, you got quite unstable,
implementation-dependent results.
Per report from Vitaly Ustinov.
Back-patch to v12 where GENERATED came in.
Discussion: https://postgr.es/m/CAM_DEiWR2DPT6U4xb-Ehigozzd3n3G37ZB1+867zbsEVtYoJww@mail.gmail.com
Branch
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REL_13_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/849c7971d1abe39d9105a768918c110414029e48
Modified Files
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src/backend/catalog/heap.c | 15 +++++++++++++--
src/test/regress/expected/generated.out | 7 +++++++
src/test/regress/sql/generated.sql | 3 +++
3 files changed, 23 insertions(+), 2 deletions(-)