Lazy init api client for connection manager to fix 940 (#941)

Author: benc-db

CHANGELOG.md

@@ -1,5 +1,9 @@
 ## dbt-databricks 1.9.6 (TBD)
 
+### Fixes
+
+- Fix for parse raising error for not having credentials ([941](https://github.com/databricks/dbt-databricks/pull/941))
+
 ### Under the Hood
 
 - Refactoring of some connection internals ([929](https://github.com/databricks/dbt-databricks/pull/929))

dbt/adapters/databricks/connections.py

@@ -202,12 +202,19 @@ class DatabricksConnectionManager(SparkConnectionManager):
 
     def __init__(self, profile: AdapterRequiredConfig, mp_context: SpawnContext):
         super().__init__(profile, mp_context)
-        creds = cast(DatabricksCredentials, self.profile.credentials)
-        self.api_client = DatabricksApiClient.create(creds, 15 * 60)
+        self._api_client: Optional[DatabricksApiClient] = None
         self.threads_compute_connections: dict[
             Hashable, dict[Hashable, DatabricksDBTConnection]
         ] = {}
 
+    @property
+    def api_client(self) -> DatabricksApiClient:
+        if self._api_client is None:
+            self._api_client = DatabricksApiClient.create(
+                cast(DatabricksCredentials, self.profile.credentials), 15 * 60
+            )
+        return self._api_client
+
     def cancel_open(self) -> list[str]:
         cancelled = super().cancel_open()
         logger.info("Cancelling open python jobs")