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Add support for NOT ENFORCED in CHECK constraints

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This adds support for the NOT ENFORCED/ENFORCED flag for constraints,
with support for check constraints.

The plan is to eventually support this for foreign key constraints,
where it is typically more useful.

Note that CHECK constraints do not currently support ALTER operations,
so changing the enforceability of an existing constraint isn't
possible without dropping and recreating it.  This could be added
later.

Author: Amul Sul <amul.sul@enterprisedb.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: jian he <jian.universality@gmail.com>
Tested-by: Triveni N <triveni.n@enterprisedb.com>
Discussion: https://www.postgresql.org/message-id/flat/CAAJ_b962c5AcYW9KUt_R_ER5qs3fUGbe4az-SP-vuwPS-w-AGA@mail.gmail.com
This commit is contained in:
Peter Eisentraut
2025-01-11 10:45:17 +01:00
parent 72ceb21b02
commit ca87c415e2
37 changed files with 599 additions and 70 deletions
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12
doc/src/sgml/ref/alter_table.sgml
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@@ -108,7 +108,7 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
PRIMARY KEY <replaceable class="parameter">index_parameters</replaceable> |
REFERENCES <replaceable class="parameter">reftable</replaceable> [ ( <replaceable class="parameter">refcolumn</replaceable> ) ] [ MATCH FULL | MATCH PARTIAL | MATCH SIMPLE ]
[ ON DELETE <replaceable class="parameter">referential_action</replaceable> ] [ ON UPDATE <replaceable class="parameter">referential_action</replaceable> ] }
[ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]
[ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ] [ ENFORCED | NOT ENFORCED ]
<phrase>and <replaceable class="parameter">table_constraint</replaceable> is:</phrase>
@@ -120,7 +120,7 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
EXCLUDE [ USING <replaceable class="parameter">index_method</replaceable> ] ( <replaceable class="parameter">exclude_element</replaceable> WITH <replaceable class="parameter">operator</replaceable> [, ... ] ) <replaceable class="parameter">index_parameters</replaceable> [ WHERE ( <replaceable class="parameter">predicate</replaceable> ) ] |
FOREIGN KEY ( <replaceable class="parameter">column_name</replaceable> [, ... ] [, PERIOD <replaceable class="parameter">column_name</replaceable> ] ) REFERENCES <replaceable class="parameter">reftable</replaceable> [ ( <replaceable class="parameter">refcolumn</replaceable> [, ... ] [, PERIOD <replaceable class="parameter">refcolumn</replaceable> ] ) ]
[ MATCH FULL | MATCH PARTIAL | MATCH SIMPLE ] [ ON DELETE <replaceable class="parameter">referential_action</replaceable> ] [ ON UPDATE <replaceable class="parameter">referential_action</replaceable> ] }
[ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]
[ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ] [ ENFORCED | NOT ENFORCED ]
<phrase>and <replaceable class="parameter">table_constraint_using_index</replaceable> is:</phrase>
@@ -1423,9 +1423,11 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
</para>
<para>
Adding a <literal>CHECK</literal> or <literal>NOT NULL</literal> constraint requires
scanning the table to verify that existing rows meet the constraint,
but does not require a table rewrite.
Adding an enforced <literal>CHECK</literal> or <literal>NOT NULL</literal>
constraint requires scanning the table to verify that existing rows meet the
constraint, but does not require a table rewrite. If a <literal>CHECK</literal>
constraint is added as <literal>NOT ENFORCED</literal>, the validation will
not be performed.
</para>
<para>