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Fix dependency on FDW handler.

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ALTER FOREIGN DATA WRAPPER could drop the dependency on the handler
function if it wasn't explicitly specified.

Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Discussion: https://postgr.es/m/35c44a4b7fb76d35418c4d66b775a88f4ce60c86.camel@j-davis.com
Backpatch-through: 14
This commit is contained in:
Jeff Davis 2026-03-19 14:59:07 -07:00
parent f154714646
commit c6f369e585
3 changed files with 17 additions and 0 deletions
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5
src/backend/commands/foreigncmds.c
View file

@ -744,6 +744,11 @@ AlterForeignDataWrapper(AlterFdwStmt *stmt)
ereport(WARNING,
(errmsg("changing the foreign-data wrapper handler can change behavior of existing foreign tables")));
}
else
{
/* handler unchanged */
fdwhandler = fdwForm->fdwhandler;
}
if (validator_given)
{

7
src/test/regress/expected/foreign_data.out
View file

@ -96,6 +96,13 @@ ERROR: function invalid_fdw_handler must return type fdw_handler
CREATE FOREIGN DATA WRAPPER test_fdw HANDLER test_fdw_handler HANDLER invalid_fdw_handler; -- ERROR
ERROR: conflicting or redundant options
CREATE FOREIGN DATA WRAPPER test_fdw HANDLER test_fdw_handler;
-- should preserve dependency on test_fdw_handler
ALTER FOREIGN DATA WRAPPER test_fdw VALIDATOR postgresql_fdw_validator;
WARNING: changing the foreign-data wrapper validator can cause the options for dependent objects to become invalid
DROP FUNCTION test_fdw_handler(); -- ERROR
ERROR: cannot drop function test_fdw_handler() because other objects depend on it
DETAIL: foreign-data wrapper test_fdw depends on function test_fdw_handler()
HINT: Use DROP ... CASCADE to drop the dependent objects too.
DROP FOREIGN DATA WRAPPER test_fdw;
-- ALTER FOREIGN DATA WRAPPER
ALTER FOREIGN DATA WRAPPER foo; -- ERROR

5
src/test/regress/sql/foreign_data.sql
View file

@ -56,6 +56,11 @@ CREATE FUNCTION invalid_fdw_handler() RETURNS int LANGUAGE SQL AS 'SELECT 1;';
CREATE FOREIGN DATA WRAPPER test_fdw HANDLER invalid_fdw_handler; -- ERROR
CREATE FOREIGN DATA WRAPPER test_fdw HANDLER test_fdw_handler HANDLER invalid_fdw_handler; -- ERROR
CREATE FOREIGN DATA WRAPPER test_fdw HANDLER test_fdw_handler;
-- should preserve dependency on test_fdw_handler
ALTER FOREIGN DATA WRAPPER test_fdw VALIDATOR postgresql_fdw_validator;
DROP FUNCTION test_fdw_handler(); -- ERROR
DROP FOREIGN DATA WRAPPER test_fdw;
-- ALTER FOREIGN DATA WRAPPER