flyrain commented on code in PR #4050:
URL: https://github.com/apache/polaris/pull/4050#discussion_r3019156955


##########
spec/polaris-management-service.yml:
##########
@@ -965,6 +967,44 @@ components:
         warehouse:
           type: string
           description: The warehouse location for the hive catalog.
+    
+    BigQueryMetastoreConnectionConfigInfo:
+      type: object
+      description: Configuration necessary for connecting to a BigQuery 
Metastore Catalog
+      allOf:
+        - $ref: '#/components/schemas/ConnectionConfigInfo'
+      properties:
+        warehouse:
+          type: string
+          description: The GCS bucket path for the catalog (e.g., 
gs://bucket-name)
+        gcpProjectId:
+          type: string
+          description: The GCP project ID
+        gcpLocation:
+          type: string
+          description: The GCP location (default = us)
+        listAllTables:
+          type: boolean
+          description: Whether to list all tables (default = true)
+        impersonateServiceAccount:
+          type: string
+          description: Service account email to impersonate
+        impersonateLifetimeSeconds:
+          type: integer
+          description: Token lifetime in seconds for impersonation (default = 
3600)
+        impersonateScopes:
+          type: array
+          items:
+            type: string
+          description: OAuth scopes for impersonation (default = 
cloud-platform)
+        impersonateDelegates:
+          type: array
+          items:
+            type: string
+          description: Delegation chain for impersonation

Review Comment:
   How often does the BQMS config surface change? For example, when new fields 
are introduced or existing fields are updated. Locking every field into the 
spec creates a maintenance burden, since each upstream change requires a 
Polaris spec PR, client regeneration, and a new release.
   
   Instead, we could consider using a bag of open properties to keep the model 
more flexible.
   ```
           properties:
             type: object
             additionalProperties:
               type: string
   ```



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