Ensure worker_save_query_explain_analyze always fully qualifies types

[marcocitus]

DESCRIPTION: Fixes a bug that could cause worker_save_query_explain_analyze to fail on custom types

We've seen cases where EXPLAIN ANALYZE fails when the query returns a type that is on the search_path on the coordinator, but not on the worker, because format_type does not qualify the name in that case.

[codecov]

Codecov Report

Merging #5776 (d6a3eef) into master (2cb02bf) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head d6a3eef differs from pull request most recent head 80b9c09. Consider uploading reports for the commit 80b9c09 to get more accurate results

@@            Coverage Diff             @@
##           master    #5776      +/-   ##
==========================================
- Coverage   92.64%   92.61%   -0.03%     
==========================================
  Files         228      227       -1     
  Lines       47474    47379      -95     
==========================================
- Hits        43980    43880     -100     
- Misses       3494     3499       +5     

[onurctirtir]

A nice test case suggestion:

create schema my_schema;
create type my_schema.my_type as (int_field int);
create table tbl (a my_schema.my_type);
SELECT create_distributed_table('tbl', 'a');
set search_path to my_schema,public;

explain analyze select * from tbl ; --worker query crashes
WARNING: SSL SYSCALL error: EOF detected
connection not open
WARNING: terminating connection because of crash of another server process
DETAIL: The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory.
HINT: In a moment you should be able to reconnect to the database and repeat your command.
ERROR: type "my_type" does not exist
CONTEXT: while executing command on localhost:10700
server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.

[marcocitus]

🚢 looks good to me