Add missing type hints to UsedTablesCrawler

Author: JCZuurmond

src/databricks/labs/ucx/source_code/used_table.py

@@ -16,14 +16,14 @@
 class UsedTablesCrawler(CrawlerBase[UsedTable]):
 
     @classmethod
-    def for_paths(cls, backend: SqlBackend, schema) -> UsedTablesCrawler:
+    def for_paths(cls, backend: SqlBackend, schema: str) -> UsedTablesCrawler:
         return UsedTablesCrawler(backend, schema, "used_tables_in_paths")
 
     @classmethod
-    def for_queries(cls, backend: SqlBackend, schema) -> UsedTablesCrawler:
+    def for_queries(cls, backend: SqlBackend, schema: str) -> UsedTablesCrawler:
         return UsedTablesCrawler(backend, schema, "used_tables_in_queries")
 
-    def __init__(self, backend: SqlBackend, schema: str, table: str):
+    def __init__(self, backend: SqlBackend, schema: str, table: str) -> None:
         """
         Initializes a DFSACrawler instance.
 
@@ -33,7 +33,7 @@ def __init__(self, backend: SqlBackend, schema: str, table: str):
         """
         super().__init__(backend=backend, catalog="hive_metastore", schema=schema, table=table, klass=UsedTable)
 
-    def dump_all(self, tables: Sequence[UsedTable]):
+    def dump_all(self, tables: Sequence[UsedTable]) -> None:
         """This crawler doesn't follow the pull model because the fetcher fetches data for 3 crawlers, not just one
         It's not **bad** because all records are pushed at once.
         Providing a multi-entity crawler is out-of-scope of this PR