Add Engine Spec for Airtable

.coveragerc

@@ -1,6 +1,8 @@
 [run]
 omit =
     setup.py
+    # We don't test this as we don't have Superset
+    airtabledb/db_engine_specs.py
 
 [report]
 exclude_lines =

airtabledb/db_engine_specs.py

@@ -0,0 +1,17 @@
+# Taken from: https://github.com/apache/superset/blob/master/superset/db_engine_specs/gsheets.py  # noqa: E501
+from superset.db_engine_specs.sqlite import SqliteEngineSpec
+
+
+class AirtableEngineSpec(SqliteEngineSpec):
+    """Engine for Airtable tables"""
+
+    engine = "airtable"
+    engine_name = "Airtable"
+    allows_joins = True
+    allows_subqueries = True
+
+    default_driver = "apsw"
+    sqlalchemy_uri_placeholder = "airtable://"
+
+    # TODO(cancan101): figure out what other spec items make sense here
+    # See: https://preset.io/blog/building-database-connector/

mypy.ini

@@ -1,4 +1,8 @@
 [mypy]
-exclude = build/
+exclude = (?x)(
+    ^build/$
+    # Can't type check as we don't install Superset:
+    | ^airtabledb/db_engine_specs\.py$
+ )
 
 plugins = sqlalchemy.ext.mypy.plugin

setup.py

@@ -20,6 +20,9 @@
         "shillelagh.adapter": [
             "airtable = airtabledb.adapter:AirtableAdapter",
         ],
+        "superset.db_engine_specs": [
+            "airtable = airtabledb.db_engine_specs:AirtableEngineSpec"
+        ],
     },
     install_requires=(
         "pyairtable",