Always reproduced (ClickHouse server version 22.3.2.1):
`
udf code, python version 3.9.6
#!/usr/bin/python

import sys
import time

if __name__ == '__main__':
    for line in sys.stdin:
        print("Python4 " + line, end='')
        sys.stdout.flush()
`

SELECT test_function_python('clickhouse')

Query id: 57da3834-1238-4da6-a984-48d4c1bb4a04

┌─test_function_python('clickhouse')─┐
│ Python4 clickhouse                 │
└────────────────────────────────────┘

1 rows in set. Elapsed: 0.001 sec.

SELECT test_function_python('clickhouse') AS uuu
GROUP BY uuu

Query id: c14131e5-e7aa-4585-a9f5-8e4b3e29fe44


0 rows in set. Elapsed: 0.002 sec.

Received exception from server (version 22.3.2):
Code: 46. DB::Exception: Received from 10.254.134.108:9000. DB::Exception: Unknown function test_function_python. (UNKNOWN_FUNCTION)


SELECT uuu
FROM
(
    SELECT test_function_python('clickhouse') AS uuu
) AS tmp
GROUP BY uuu

Query id: 20ca737b-35e1-418a-ab8e-2a296ac44e28

┌─uuu────────────────┐
│ Python4 clickhouse │
└────────────────────┘

1 rows in set. Elapsed: 0.002 sec.
{
    if (!select_query->groupBy())
        return;
    auto group_by = select_query->groupBy();
    const auto & group_by_keys = group_by->children;
    ASTs modified; 
    GroupByKeysInfo group_by_keys_data = getGroupByKeysInfo(group_by_keys);
    if (!group_by_keys_data.has_function)
        return;
    GroupByFunctionKeysVisitor::Data visitor_data{group_by_keys_data.key_names};
    GroupByFunctionKeysVisitor(visitor_data).visit(group_by);
    modified.reserve(group_by_keys.size());
    
    for (const auto & group_key : group_by_keys)
        if (group_by_keys_data.key_names.contains(group_key->getColumnName()))
            modified.push_back(group_key);
    
    group_by->children = modified;
}
void optimizeAggregateFunctionsOfGroupByKeys(ASTSelectQuery * select_query, ASTPtr & node)