Re: 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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