github-code-scanning[bot] commented on code in PR #14574:
URL: https://github.com/apache/druid/pull/14574#discussion_r1261343872


##########
integration-tests-ex/cases/src/test/java/org/apache/druid/testsEx/msq/ITKeyStatisticsSketchMergeMode.java:
##########
@@ -190,4 +190,79 @@
 
     msqHelper.testQueriesFromFile(QUERY_FILE, datasource);
   }
+
+
+  @Test
+  public void testMsqIngestionSequentialMergingWithEmptyStatistics() throws 
Exception
+  {
+    String datasource = "dst";
+
+    // Clear up the datasource from the previous runs
+    coordinatorClient.unloadSegmentsForDataSource(datasource);
+
+    String queryLocal =
+        StringUtils.format(
+            "Replace INTO %s overwrite ALL \n"
+            + "SELECT\n"
+            + "  TIME_PARSE(\"timestamp\") AS __time,\n"
+            + "  isRobot,\n"
+            + "  diffUrl,\n"
+            + "  added,\n"
+            + "  countryIsoCode,\n"
+            + "  regionName,\n"
+            + "  channel,\n"
+            + "  flags,\n"
+            + "  delta,\n"
+            + "  isUnpatrolled,\n"
+            + "  isNew,\n"
+            + "  deltaBucket,\n"
+            + "  isMinor,\n"
+            + "  isAnonymous,\n"
+            + "  deleted,\n"
+            + "  cityName,\n"
+            + "  metroCode,\n"
+            + "  namespace,\n"
+            + "  comment,\n"
+            + "  page,\n"
+            + "  commentLength,\n"
+            + "  countryName,\n"
+            + "  user,\n"
+            + "  regionIsoCode\n"
+            + "FROM TABLE(\n"
+            + "  EXTERN(\n"
+            + "    
'{\"type\":\"local\",\"files\":[\"/resources/data/batch_index/json/wikipedia_index_data1.json\",\"/resources/data/batch_index/json/wikipedia_index_data2.json\"]}',\n"
+            + "    '{\"type\":\"json\"}',\n"
+            + "    
'[{\"type\":\"string\",\"name\":\"timestamp\"},{\"type\":\"string\",\"name\":\"isRobot\"},{\"type\":\"string\",\"name\":\"diffUrl\"},{\"type\":\"long\",\"name\":\"added\"},{\"type\":\"string\",\"name\":\"countryIsoCode\"},{\"type\":\"string\",\"name\":\"regionName\"},{\"type\":\"string\",\"name\":\"channel\"},{\"type\":\"string\",\"name\":\"flags\"},{\"type\":\"long\",\"name\":\"delta\"},{\"type\":\"string\",\"name\":\"isUnpatrolled\"},{\"type\":\"string\",\"name\":\"isNew\"},{\"type\":\"double\",\"name\":\"deltaBucket\"},{\"type\":\"string\",\"name\":\"isMinor\"},{\"type\":\"string\",\"name\":\"isAnonymous\"},{\"type\":\"long\",\"name\":\"deleted\"},{\"type\":\"string\",\"name\":\"cityName\"},{\"type\":\"long\",\"name\":\"metroCode\"},{\"type\":\"string\",\"name\":\"namespace\"},{\"type\":\"string\",\"name\":\"comment\"},{\"type\":\"string\",\"name\":\"page\"},{\"type\":\"long\",\"name\":\"commentLength\"},{\"type\":\"string\",\"name\":\"countryName\"},{\"type\":
 
\"string\",\"name\":\"user\"},{\"type\":\"string\",\"name\":\"regionIsoCode\"}]'\n"
+            + "  )\n"
+            + ")\n"
+            + "where delta=111 "
+            // we add this filter since delta=111 is only present in 
wikipedia_index_data1.json. This means partitions from worker 2 will be empty.
+            + "PARTITIONED BY DAY\n"
+            + "CLUSTERED BY \"__time\"",
+            datasource
+        );
+
+    ImmutableMap<String, Object> context = ImmutableMap.of(
+        MultiStageQueryContext.CTX_CLUSTER_STATISTICS_MERGE_MODE,
+        ClusterStatisticsMergeMode.SEQUENTIAL,
+        MultiStageQueryContext.CTX_MAX_NUM_TASKS,
+        3
+    );
+
+    // Submit the task and wait for the datasource to get loaded
+    SqlQuery sqlQuery = new SqlQuery(queryLocal, null, false, false, false, 
context, null);
+    SqlTaskStatus sqlTaskStatus = msqHelper.submitMsqTask(sqlQuery);
+
+    if (sqlTaskStatus.getState().isFailure()) {
+      Assert.fail(StringUtils.format(
+          "Unable to start the task successfully.\nPossible exception: %s",
+          sqlTaskStatus.getError()

Review Comment:
   ## Use of default toString()
   
   Default toString(): ErrorResponse inherits toString() from Object, and so is 
not suitable for printing.
   
   [Show more 
details](https://github.com/apache/druid/security/code-scanning/5267)



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