fix: IS NULL filter operator for numeric columns (#13496)

tests/query_context_tests.py

@@ -14,6 +14,8 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+import re
+
 import pytest
 
 from superset import db
@@ -305,8 +307,15 @@ class TestQueryContext(SupersetTestCase):
         assert len(responses) == 1
         response = responses["queries"][0]
         assert len(response) == 2
+        sql_text = response["query"]
         assert response["language"] == "sql"
-        assert "SELECT" in response["query"]
+        assert "SELECT" in sql_text
+        assert re.search(r'[`"\[]?num[`"\]]? IS NOT NULL', sql_text)
+        assert re.search(
+            r"""NOT \([`"\[]?name[`"\]]? IS NULL[\s\n]* """
+            r"""OR [`"\[]?name[`"\]]? IN \('abc'\)\)""",
+            sql_text,
+        )
 
     @pytest.mark.usefixtures("load_birth_names_dashboard_with_slices")
     def test_fetch_values_predicate_in_query(self):