maytasm commented on a change in pull request #11164:
URL: https://github.com/apache/druid/pull/11164#discussion_r622702813



##########
File path: 
server/src/main/java/org/apache/druid/metadata/SQLMetadataRuleManager.java
##########
@@ -421,8 +422,35 @@ public Void inTransaction(Handle handle, TransactionStatus 
transactionStatus) th
     return true;
   }
 
+  @Override
+  public int removeRulesOlderThan(long timestamp)
+  {
+    DateTime dateTime = DateTimes.utc(timestamp);
+    synchronized (lock) {
+      return dbi.withHandle(
+          handle -> {
+            Update sql = handle.createStatement(
+                StringUtils.format(
+                    "DELETE FROM %1$s WHERE datasource NOT IN (SELECT DISTINCT 
datasource from %2$s) and datasource!=:default_rule and version < :date_time",

Review comment:
       Added comment on `version` as suggested.




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