Forbid marking an identity column as nullable. GENERATED ALWAYS AS IDENTITY implies NOT NULL, but the code failed to complain if you overrode that with "GENERATED ALWAYS AS IDENTITY NULL". One might think the old behavior was a feature, but it was inconsistent because the outcome varied depending on the order of the clauses, so it seems to have been just an oversight.
Per bug #16913 from Pavel Boev. Back-patch to v10 where identity columns were introduced. Vik Fearing (minor tweaks by me) Discussion: https://postgr.es/m/[email protected] Branch ------ REL_10_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/e5794cd593940e48710693c0cdd97c6d7b91f500 Modified Files -------------- doc/src/sgml/ref/create_table.sgml | 1 + src/backend/parser/parse_utilcmd.c | 12 +++++++++++- src/test/regress/expected/identity.out | 13 +++++++++++++ src/test/regress/sql/identity.sql | 9 +++++++++ 4 files changed, 34 insertions(+), 1 deletion(-)
