BUG #18813: Materialized view creation regression when inlining recursive SQL function

On Sun, 2025-02-16 at 15:49 +0000, PG Bug reporting form wrote:

I've encountered an error when creating a materialized view as I updated
its body by introducing a recursive function.

On postgreSQL 16, it works as expected: the materialized view is created and
works as intended.
Starting from posgreSQL 17.0, the materialized view created failed with the
error message

ERROR:  function jsonb_recursive_merge(jsonb, jsonb) does not exist
LINE 9:                    ELSE jsonb_recursive_merge(va::jsonb, vb:...
                                ^
HINT:  No function matches the given name and argument types. You might need
to add explicit type casts.
CONTEXT:  SQL function "jsonb_recursive_merge" during inlining

postgreSQL 17.3 also returns the same error.

That's not a bug, that's expected:
https://www.postgresql.org/docs/current/release-17.html#RELEASE-17-MIGRATION

Change functions to use a safe search_path during maintenance operations (Jeff Davis)

So that's actually a bug in your function definition.
Fix it by running

ALTER FUNCTION ... SET search_path = schema_containing_function;

Make sure that the schema does *not* have CREATE privileges for PUBLIC...

Yours,
Laurenz Albe

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Le 16/02/2025 à 17:24, Laurenz Albe a écrit :

On Sun, 2025-02-16 at 15:49 +0000, PG Bug reporting form wrote:

I've encountered an error when creating a materialized view as I updated
its body by introducing a recursive function.

On postgreSQL 16, it works as expected: the materialized view is created and
works as intended.
Starting from posgreSQL 17.0, the materialized view created failed with the
error message

ERROR:  function jsonb_recursive_merge(jsonb, jsonb) does not exist
LINE 9:                    ELSE jsonb_recursive_merge(va::jsonb, vb:...
                                ^
HINT:  No function matches the given name and argument types. You might need
to add explicit type casts.
CONTEXT:  SQL function "jsonb_recursive_merge" during inlining

postgreSQL 17.3 also returns the same error.

That's not a bug, that's expected:
https://www.postgresql.org/docs/current/release-17.html#RELEASE-17-MIGRATION

Change functions to use a safe search_path during maintenance operations (Jeff Davis)

So that's actually a bug in your function definition.
Fix it by running

ALTER FUNCTION ... SET search_path = schema_containing_function;

Make sure that the schema does *not* have CREATE privileges for PUBLIC...

Many thanks for the fast on point answer.

I had read this part of the release note, but did not think it would
apply to functions defined in PUBLIC (as it was part of the default
search_path)

ALTER FUNCTION ... SET search_path = public;

fixed my script in 17.x, indeed.

Thanks a lot, sorry for not finding out by myself.

Take care,

  Olivier