imay commented on a change in pull request #1778: Fix bug that failed to limit 
the mem usage of HLL column when loading
URL: https://github.com/apache/incubator-doris/pull/1778#discussion_r322753911
 
 

 ##########
 File path: be/src/olap/aggregate_func.h
 ##########
 @@ -435,7 +436,7 @@ struct 
AggregateFuncTraits<OLAP_FIELD_AGGREGATION_HLL_UNION, OLAP_FIELD_TYPE_HLL
         slice->data = arena->Allocate(HLL_COLUMN_DEFAULT_LEN);
         slice->size = hll->serialize(slice->data);
 
-        delete hll;
+        hll->~HyperLogLog();
 
 Review comment:
   should change 
[there](https://github.com/apache/incubator-doris/pull/1778/files#diff-6b1f7d667aa162c48abc8d5fd9b4f6b0R428)

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