update rate

Author: smallfish

src/common/cloud_control/proto/billing.proto

@@ -38,12 +38,13 @@ message BillingUsageDailyRow {
   // Examples: second, byte, request.
   string usage_unit = 6;
 
-  // Unit price encoded as a decimal string. Empty string means absent.
+  // Reserved billing unit price field.
+  // Empty string means the rate is intentionally undisclosed.
   string rate = 7;
 
-  // Unit for rate.
+  // Billing dimension unit for the reserved rate field.
   // Examples: second, tb_day, k_request.
-  // Empty string means absent.
+  // Returned when the billing dimension is known.
   string rate_unit = 8;
 
   // Final billed amount encoded as a decimal string.

src/common/cloud_control/tests/it/billing_client.rs

@@ -48,7 +48,7 @@ impl BillingService for MockBillingService {
                 resource_name: "default".to_string(),
                 usage: "2653".to_string(),
                 usage_unit: "second".to_string(),
-                rate: "0.0002777777777778".to_string(),
+                rate: "".to_string(),
                 rate_unit: "second".to_string(),
                 usage_in_currency: "0.737".to_string(),
                 currency: "USD".to_string(),

src/query/service/tests/it/table_functions/billing_usage.rs

@@ -76,7 +76,7 @@ impl BillingService for MockBillingServiceImpl {
                 resource_name: "default".to_string(),
                 usage: "2653".to_string(),
                 usage_unit: "second".to_string(),
-                rate: "0.0002777777777778".to_string(),
+                rate: "".to_string(),
                 rate_unit: "second".to_string(),
                 usage_in_currency: "0.737".to_string(),
                 currency: "¥".to_string(),

src/query/task_support/src/table_functions/billing_usage_daily.rs

@@ -394,7 +394,7 @@ mod tests {
                 resource_name: "default".to_string(),
                 usage: "2653".to_string(),
                 usage_unit: "second".to_string(),
-                rate: "0.0002777777777778".to_string(),
+                rate: "".to_string(),
                 rate_unit: "second".to_string(),
                 usage_in_currency: "0.737".to_string(),
                 currency: "¥".to_string(),
@@ -446,7 +446,7 @@ mod tests {
                 resource_name: String::new(),
                 usage: "1580580967006".to_string(),
                 usage_unit: "byte".to_string(),
-                rate: "0.7419354838709677".to_string(),
+                rate: "".to_string(),
                 rate_unit: "tb_day".to_string(),
                 usage_in_currency: "1.067".to_string(),
                 currency: "$".to_string(),