Hey I\u2019m trying to import a table from Druid that uses the Datasketches library. One of the columns is a quantiles datasketch and Superset seems to be erroring when importing this table with the following error:\n\n```ERROR:root:Type BLOB is not supported\nsuperset_app             | Traceback (most recent call last):\nsuperset_app             |   File "/usr/local/lib/python3.7/site-packages/flask_appbuilder/api/__init__.py", line 84, in wraps\nsuperset_app             |     return f(self, *args, **kwargs)\nsuperset_app             |   File "/app/superset/views/base_api.py", line 79, in wraps\nsuperset_app             |     duration, response = time_function(f, self, *args, **kwargs)\nsuperset_app             |   File "/app/superset/utils/core.py", line 1320, in time_function\nsuperset_app             |     response = func(*args, **kwargs)\nsuperset_app             |   File "/app/superset/datasets/api.py", line 223, in post\nsuperset_app             |     new_model = CreateDatasetCommand(g.user, item).run()\nsuperset_app             |   File "/app/superset/datasets/commands/create.py", line 52, in run\nsuperset_app             |     dataset.fetch_metadata(commit=False)\nsuperset_app             |   File "/app/superset/connectors/sqla/models.py", line 1363, in fetch_metadata\nsuperset_app             |     new_columns = self.external_metadata()\nsuperset_app             |   File "/app/superset/connectors/sqla/models.py", line 698, in external_metadata\nsuperset_app             |     col["type"], db_dialect\nsuperset_app             |   File "/app/superset/db_engine_specs/base.py", line 988, in column_datatype_to_string\nsuperset_app             |     return sqla_column_type.compile(dialect=dialect).upper()\nsuperset_app             |   File "/usr/local/lib/python3.7/site-packages/sqlalchemy/sql/type_api.py", line 605, in compile\nsuperset_app             |     return dialect.type_compiler.process(self)\nsuperset_app             |   File "/usr/local/lib/python3.7/site-packages/sqlalchemy/sql/compiler.py", line 403, in process\nsuperset_app             |     return type_._compiler_dispatch(self, **kw)\nsuperset_app             |   File "/usr/local/lib/python3.7/site-packages/sqlalchemy/sql/visitors.py", line 96, in _compiler_dispatch\nsuperset_app             |     return meth(self, **kw)\nsuperset_app             |   File "/usr/local/lib/python3.7/site-packages/pydruid/db/sqlalchemy.py", line 78, in visit_BLOB\nsuperset_app             |     raise exceptions.NotSupportedError("Type BLOB is not supported")\nsuperset_app             | pydruid.db.exceptions.NotSupportedError: Type BLOB is not supported ```\nIs there a way around this? It seems pydruid doesn\u2019t support columns with type `other`. Is there a way to specify only certain columns for the dataset?