Avoid wildcard table (#294)

Author: whites11

pkg/resource/descriptions/grant_privilege.md

@@ -2,6 +2,8 @@
 
 You can use the `clickhouse_grant_privilege` resource to grant privileges on databases and tables to either a `clickhouse_user` or a `clickhouse_role`.
 
+Please note that in order to grant privileges to all database and/or all tables, the `database` and/or `table` fields must be set to null, and not to "*".
+
 Attention: in order to use the `clickhouse_grant_privilege` resource you need to set the `query_api_endpoint` attribute in the `clickhouse_service`.
 Please check [full example](https://github.com/ClickHouse/terraform-provider-clickhouse/blob/main/examples/rbac/main.tf).
 

pkg/resource/grant_privilege.go

@@ -108,6 +108,7 @@ func (r *GrantPrivilegeResource) Schema(_ context.Context, _ resource.SchemaRequ
 				},
 				Validators: []validator.String{
 					stringvalidator.LengthAtLeast(1),
+					stringvalidator.NoneOf("*"),
 				},
 			},
 			"column_name": schema.StringAttribute{