'list' object has no attribute 'encode'

[LSIND]

Describe the bug Faced an error Unhandled exception while executing query: 'list' object has no attribute 'encode' when querying columns of type aclitem (catalog representation of access privileges).

To Reproduce

1. SELECT-statements to system tables which query column of type aclitem (limit for short output):

   
   -- column relacl 
   SELECT relname, relacl 
   FROM pg_class 
   WHERE relacl IS NOT NULL LIMIT 2;

-- column attacl SELECT attrelid::regclass, attname, attoptions, attacl FROM pg_attribute WHERE attacl IS NOT NULL LIMIT 2;

2. Error (same for both queries, result is exactly two rows)

SELECT 2 Unhandled exception while executing query: 'list' object has no attribute 'encode'

**Expected behavior**
psql (13.6) produces correct results (your output can be different based on privileges and roles in your system):
``` sql 
SELECT relname, relacl 
FROM pg_class 
WHERE relacl IS NOT NULL LIMIT 2;

relname	relacl
users_depts	{postgres=arwdDxt/postgres,alice=r/postgres,bob=r/postgres}
revenue	{postgres=arwdDxt/postgres,alice=r/postgres,bob=r/postgres}

SELECT attrelid::regclass,  attname, attoptions, attacl
FROM pg_attribute
WHERE attacl IS NOT NULL LIMIT 2;

attrelid	attname	attoptions	attacl
pg_subscription	subdbid		{=r/postgres}
pg_subscription	subname		{=r/postgres}

Desktop (please complete the following information):

• OS: Windows Server 2019 x64 and Windows 10 x64

ADS:

• ADS Version 1.47.1 (system setup)
• ADS PostgresSQL extension version 0.6.0
• PostgreSQL version 13.8, compiled by Visual C++ build 1914, 64-bit

Additional context As a temporary solution I use function pg_catalog.array_to_string(array, delimiter) to convert each array element of aclitem type to its text representation:

SELECT relname, pg_catalog.array_to_string(relacl, ', ') as relacl
FROM pg_class 
WHERE relacl IS NOT NULL LIMIT 2;
-- or just cast to text

SELECT relname, relacl::text as relacl
FROM pg_class 
WHERE relacl IS NOT NULL LIMIT 2;

relname	relacl
users_depts	postgres=arwdDxt/postgres, alice=r/postgres, bob=r/postgres
revenue	postgres=arwdDxt/postgres, alice=r/postgres, bob=r/postgres

[craftzneko]

I have the same issue when running this query

SELECT * 
FROM pg_class
WHERE relname = 'MYTABLENAME';