Hi. Has anyone encountered this error before on release 0.37.2? It comes up when I preview a table from the dropdown in SQL Lab.\n```superset_app       | 172.25.0.1 - - [07/Oct/2020:00:05:04 +0000] "GET /api/v1/database/1/table/rls_filter_tables/public/ HTTP/1.1" 200 361 "<http://localhost:8080/superset/sqllab>" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36"\nsuperset_app       | Triggering query_id: 2\nsuperset_app       | INFO:superset.views.core:Triggering query_id: 2\nsuperset_app       | timeout can't be used in the current context\nsuperset_app       | WARNING:superset.utils.core:timeout can't be used in the current context\nsuperset_app       | signal only works in main thread\nsuperset_app       | Traceback (most recent call last):\nsuperset_app       |   File "/app/superset/utils/core.py", line 624, in __enter__\nsuperset_app       |     signal.signal(signal.SIGALRM, self.handle_timeout)\nsuperset_app       |   File "/opt/sfdc/python36/lib/python3.6/signal.py", line 47, in signal\nsuperset_app       |     handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))\nsuperset_app       | ValueError: signal only works in main thread\nsuperset_app       | ERROR:superset.utils.core:signal only works in main thread\nsuperset_app       | Traceback (most recent call last):\nsuperset_app       |   File "/app/superset/utils/core.py", line 624, in __enter__\nsuperset_app       |     signal.signal(signal.SIGALRM, self.handle_timeout)\nsuperset_app       |   File "/opt/sfdc/python36/lib/python3.6/signal.py", line 47, in signal\nsuperset_app       |     handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))\nsuperset_app       | ValueError: signal only works in main thread\nsuperset_app       | Query 2: Executing 1 statement(s)\nsuperset_app       | INFO:superset.sql_lab:Query 2: Executing 1 statement(s)\nsuperset_app       | Query 2: Set query to 'running'\nsuperset_app       | INFO:superset.sql_lab:Query 2: Set query to 'running'\nsuperset_app       | Query 2: Running statement 1 out of 1\nsuperset_app       | INFO:superset.sql_lab:Query 2: Running statement 1 out of 1```