User defined functions: query hangs forever

Build 6.5.0-4926

1. Create a new cluster
2. Enable DP mode
3. load `travel-sample` bucket.
4. run the following queries:

create function locations(vType){(select id, name, address, city from `travel-sample` where type=vType)};

drop function locations;

select locations('airport')

Last query does not return any errors and hangs forever.

No panic is found in server logs. Logs are attached.