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Add ALTER TABLE ... ALTER CONSTRAINT ... SET [NO] INHERIT

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This allows to redefine an existing non-inheritable constraint to be
inheritable, which allows to straighten up situations with NO INHERIT
constraints so that thay can become normal constraints without having to
re-verify existing data.  For existing inheritance children this may
require creating additional constraints, if they don't exist already.

It also allows to do the opposite, if only for symmetry.

Author: Suraj Kharage <suraj.kharage@enterprisedb.com>
Reviewed-by: jian he <jian.universality@gmail.com>
Discussion: https://postgr.es/m/CAF1DzPVfOW6Kk=7SSh7LbneQDJWh=PbJrEC_Wkzc24tHOyQWGg@mail.gmail.com
This commit is contained in:
Álvaro Herrera
2025-03-05 13:50:22 +01:00
parent f4694e0f35
commit f4e53e10b6
6 changed files with 359 additions and 19 deletions
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23
doc/src/sgml/ref/alter_table.sgml
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@ -59,6 +59,7 @@ ALTER TABLE [ IF EXISTS ] <replaceable class="parameter">name</replaceable>
ADD <replaceable class="parameter">table_constraint</replaceable> [ NOT VALID ]
ADD <replaceable class="parameter">table_constraint_using_index</replaceable>
ALTER CONSTRAINT <replaceable class="parameter">constraint_name</replaceable> [ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]
ALTER CONSTRAINT <replaceable class="parameter">constraint_name</replaceable> SET [ INHERIT | NO INHERIT ]
VALIDATE CONSTRAINT <replaceable class="parameter">constraint_name</replaceable>
DROP CONSTRAINT [ IF EXISTS ] <replaceable class="parameter">constraint_name</replaceable> [ RESTRICT | CASCADE ]
DISABLE TRIGGER [ <replaceable class="parameter">trigger_name</replaceable> | ALL | USER ]
@ -556,11 +557,31 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
<listitem>
<para>
This form alters the attributes of a constraint that was previously
created. Currently only foreign key constraints may be altered.
created. Currently only foreign key constraints may be altered in
this fashion, but see below.
</para>
</listitem>
</varlistentry>
<varlistentry id="sql-altertable-desc-alter-constraint-inherit">
<term><literal>ALTER CONSTRAINT ... SET INHERIT</literal></term>
<term><literal>ALTER CONSTRAINT ... SET NO INHERIT</literal></term>
<listitem>
<para>
These forms modify a inheritable constraint so that it becomes not
inheritable, or vice-versa. Only not-null constraints may be altered
in this fashion at present.
In addition to changing the inheritability status of the constraint,
in the case where a non-inheritable constraint is being marked
inheritable, if the table has children, an equivalent constraint
will be added to them. If marking an inheritable constraint as
non-inheritable on a table with children, then the corresponding
constraint on children will be marked as no longer inherited,
but not removed.
</para>
</listitem>
</varlistentry>
<varlistentry id="sql-altertable-desc-validate-constraint">
<term><literal>VALIDATE CONSTRAINT</literal></term>
<listitem>