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Allow NOT VALID foreign key constraints on partitioned tables

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This feature was intentionally omitted when FKs were first implemented
for partitioned tables, and had been requested a few times; the
usefulness is clear.

Validation can happen for each partition individually, which is useful
to contain the number of locks held and the duration; or it can be
executed for the partitioning hierarchy as a single command, which
validates all child constraints that haven't been validated already.

This is also useful to implement NOT ENFORCED constraints on top.

Author: Amul Sul <sulamul@gmail.com>
Discussion: https://postgr.es/m/CAAJ_b96Bp=-ZwihPPtuaNX=SrZ0U6ZsXD3+fgARO0JuKa8v2jQ@mail.gmail.com
This commit is contained in:
Álvaro Herrera
2025-01-23 15:54:38 +01:00
parent b35434b134
commit b663b9436e
4 changed files with 263 additions and 58 deletions
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doc/src/sgml/ref/alter_table.sgml
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@ -486,8 +486,6 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
<para>
Additional restrictions apply when unique or primary key constraints
are added to partitioned tables; see <link linkend="sql-createtable"><command>CREATE TABLE</command></link>.
Also, foreign key constraints on partitioned
tables may not be declared <literal>NOT VALID</literal> at present.
</para>
</listitem>