Github user jackylk commented on a diff in the pull request:

    https://github.com/apache/incubator-carbondata/pull/533#discussion_r96003271
  
    --- Diff: 
core/src/main/java/org/apache/carbondata/scan/executor/impl/AbstractQueryExecutor.java
 ---
    @@ -470,6 +477,7 @@ private AggregatorInfo 
getAggregatorInfoForBlock(QueryModel queryModel,
        */
       @Override public void finish() throws QueryExecutionException {
         CarbonUtil.clearBlockCache(queryProperties.dataBlocks);
    +    queryIterator.close();
    --- End diff --
    
    queryIterator is assigned in subclass?
    better to add a if check here for null value


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