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Forbid marking an identity column as nullable.

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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/16913-3b5198410f67d8c6@postgresql.org
This commit is contained in:
Tom Lane
2021-03-12 11:08:42 -05:00
parent ce54c024d9
commit e7f7950f67
4 changed files with 33 additions and 0 deletions
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doc/src/sgml/ref/create_table.sgml
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@ -840,6 +840,7 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
column</firstterm>. It will have an implicit sequence attached to it
and the column in new rows will automatically have values from the
sequence assigned to it.
Such a column is implicitly <literal>NOT NULL</literal>.
</para>
<para>