bugfix for lancedb uri parsing when using an object store

Author: s-sajid-ali

packages/graphrag/graphrag/config/models/graph_rag_config.py

@@ -262,9 +262,11 @@ def _validate_vector_store_db_uri(self) -> None:
         """Validate the vector store configuration."""
         store = self.vector_store
         if store.type == VectorStoreType.LanceDB:
-            if not store.db_uri or store.db_uri.strip == "":
+            if not store.db_uri or store.db_uri.strip() == "":
                 store.db_uri = graphrag_config_defaults.vector_store.db_uri
-            store.db_uri = str(Path(store.db_uri).resolve())
+            # Only convert to a filesystem path if the URI is not for object store
+            if not store.db_uri.startswith(("az://", "s3://", "gs://")):
+                store.db_uri = str(Path(store.db_uri).resolve())
 
     def get_completion_model_config(self, model_id: str) -> ModelConfig:
         """Get a completion model configuration by ID.