pg_restore 错误：function raise_err(unknown) 不存在

Question

I run a daily backup of my database using pg_dump and pg_restore that recently stopped working after I pushed an update.

I have a function validate_id that's a Case/When statement just as a quick check for some the data that has integrity issues. Looks something like this:

CREATE OR REPLACE FUNCTION validate_id(
    _string text,
    _type type
) RETURNS boolean AS
$$
SELECT
    CASE WHEN (stuff) THEN TRUE
    WHEN (other stuff) THEN TRUE
    When (more stuff) THEN raise_err('Not an accepted type, the accepted types are: x y z')
ELSE FALSE
$$
LANGUAGE SQL;

Since I added this function, when I dump using this command:

pg_dump -U postgres -h ipaddress -p 5432 -w -F t databaseName > backupsfolder/databaseName.tar

When I use this command:

pg_restore -U postgres -h localhost -p 5432 -d postgres -C "backupsfolder/databaseName.tar"

As of two days ago, this now throws an error:

pg_restore: error: could not execute query: ERROR: function raise_err(unknown) does not exist

I'm pretty lost on what to do. I think what might be going on is that it's trying to restore this function before it restores the raise_err function. Which I thought was built-in to postgres (I can SELECT raise_err('Hello, World'); ). Is this possible? Is it my CASE statement because I need to return only Booleans? All of the permissions seem correct and restoring with previous backups works fine.

Answer 1

The problem is that raise_err is not schema qualified in your function code.

This is potentially dangerous: a malicious user could create his own function raise_err and set search_path so that the wrong function is called.

Since pg_restore is typically run by a superuser, this can be a security problem. Imagine such a function being used in an index definition!

For these reasons pg_dump and pg_restore set an empty search_path in current versions of PostgreSQL.

The solution to your problem is to explicitly use the function's schema in your SQL statement.

Answer 2

I ended up solving this issue by explicitly setting the search paths for both functions, raise_err() and validate_id() to public :

ALTER FUNCTION validate_id(text,text) SET search_path=public;
ALTER FUNCTION raise_err(text,text) SET search_path=public;