[GitHub] [incubator-druid] jihoonson opened a new issue #7621: NPE when both populateResultLevelCache and grandTotal are set

[GitBox <gi...@apache.org>]

jihoonson opened a new issue #7621: NPE when both populateResultLevelCache and grandTotal are set
URL: https://github.com/apache/incubator-druid/issues/7621
 
 
   ### Affected Version
   
   All versions since 0.13.0
   
   ### Description
   
   The grandTotal doesn't have timestamp and it is filled with null in the result set. If `populateResultLevelCache` is set, the below code is executed and `input.getTimestamp().getMillis()` throws NPE.
   
   ```java
         @Override
         public Function<Result<TimeseriesResultValue>, Object> prepareForCache(boolean isResultLevelCache)
         {
           return input -> {
             TimeseriesResultValue results = input.getValue();
             final List<Object> retVal = Lists.newArrayListWithCapacity(1 + aggs.size());
   
             retVal.add(input.getTimestamp().getMillis());
             for (AggregatorFactory agg : aggs) {
               retVal.add(results.getMetric(agg.getName()));
             }
             if (isResultLevelCache) {
               for (PostAggregator postAgg : query.getPostAggregatorSpecs()) {
                 retVal.add(results.getMetric(postAgg.getName()));
               }
             }
             return retVal;
           };
         }
   ```

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