[GitHub] [incubator-druid] ccaominh commented on a change in pull request #8535: fix caching bug with multi-column group-by

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ccaominh commented on a change in pull request #8535: fix caching bug with multi-column group-by
URL: https://github.com/apache/incubator-druid/pull/8535#discussion_r324301668
 
 

 ##########
 File path: processing/src/main/java/org/apache/druid/query/groupby/GroupByQueryQueryToolChest.java
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 @@ -639,7 +639,7 @@ public ResultRow apply(Object input)
 
               // Must convert generic Jackson-deserialized type into the proper type.
               resultRow.set(
-                  dimensionStart + dimPos,
+                  dimensionStart + dimPos++,
 
 Review comment:
   The increment operation can be hard to notice as it's embedded within the argument to a function call. Some alternatives that may improve readability:
   
   ```java
   resultRow.set(
       dimensionStart + dimPos,
       DimensionHandlerUtils.convertObjectToType(results.next(), dimensionSpec.getOutputType())
   );
   dimPos++;
   ```
   
   or changing the while-loop to a for-loop (which also has the nice effect of reducing the scope of `dimPos`):
   
   ```java
   for (int dimPos = 0; dimsIter.hasNext() && results.hasNext(); dimPos++) {
   ```

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