ankitsultana commented on code in PR #10336:
URL: https://github.com/apache/pinot/pull/10336#discussion_r1119349115


##########
pinot-controller/src/main/java/org/apache/pinot/controller/api/resources/PinotQueryResource.java:
##########
@@ -170,10 +171,10 @@ private String getMultiStageQueryResponse(String query, 
String queryOptions, Htt
       return QueryException.ACCESS_DENIED_ERROR.toString();
     }
 
-    // Get brokers, only DEFAULT tenant is supported for now.
-    // TODO: implement logic that only allows executing query where all 
accessed tables are within the same tenant.
-    List<String> instanceIds = new 
ArrayList<>(_pinotHelixResourceManager.getAllInstancesForBrokerTenant(
-        TagNameUtils.DEFAULT_TENANT_NAME));
+    SqlNodeAndOptions sqlNodeAndOptions = RequestUtils.parseQuery(query);
+    List<String> tableNames = 
CalciteSqlParser.extractTableNamesFromNode(sqlNodeAndOptions.getSqlNode());
+
+    List<String> instanceIds = getCommonInstances(tableNames);

Review Comment:
   > the actual broker API only supports default tenant (hard-coded in many 
places)
   
   You mean for multistage? We are actually running it in a non-default tenant 
internally. Queries work if you directly hit the broker that you know is in the 
tenant that you want.



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