walterddr commented on code in PR #10336:
URL: https://github.com/apache/pinot/pull/10336#discussion_r1132824868


##########
pinot-controller/src/main/java/org/apache/pinot/controller/api/resources/PinotQueryResource.java:
##########
@@ -170,10 +171,20 @@ 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());
+    if (tableNames.size() == 0) {
+      return QueryException.SQL_PARSING_ERROR.toString();
+    }
+
+    String brokerTenant = getCommonBrokerTenant(tableNames);
+    String serverTenant = getCommonServerTenant(tableNames);
+    if (brokerTenant == null || serverTenant == null) {
+      return 
QueryException.getException(QueryException.BROKER_REQUEST_SEND_ERROR,
+          new Exception("Unable to dispatch multistage query with multiple 
tables on different tenant")).toString();

Review Comment:
   can you attach the `tableNames` in the error message to make it more 
informative?



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