Re: logical replication worker can't find postgis function

On Fri, 2022-04-22 at 13:25 +0200, Willy-Bas Loos wrote:
> I'm using logical replication on postgresql 13. On the subscriber, there's a trigger on a table that calculates the area of the geometry that's in another column.
> I enabled the trigger with
> ALTER TABLE atable ENABLE ALWAYS TRIGGER atrigger;
>
> But the logical replication worker can't find st_area:
> 2022-04-22 13:14:11.244 CEST [1932237] LOG:  logical replication apply worker for subscription "ba_acc1" has started
> 2022-04-22 13:14:11.282 CEST [1932237] ERROR:  function st_area(public.geometry) does not exist at character 14
> 2022-04-22 13:14:11.282 CEST [1932237] HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
> 2022-04-22 13:14:11.282 CEST [1932237] QUERY:  SELECT round(st_area(NEW.epsg28992_geom))
> 2022-04-22 13:14:11.282 CEST [1932237] CONTEXT:  PL/pgSQL function util.location_extras() line 3 at assignment
> 2022-04-22 13:14:11.285 CEST [1562110] LOG:  background worker "logical replication worker" (PID 1932237) exited with exit code 1
>
> The trigger works well when I fire it in a normal update query.
> How can this happen and how can I resolve this?

The trigger function is bad and dangerous, because it relies on the current setting of "search_path".

You notice that with logical replication, because "search_path" is empty to avoid security problems.

Fix your function:

ALTER FUNCTION trigger_function() SET search_path = public;

Yours,
Laurenz Albe
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