imay commented on a change in pull request #1432: Add percentile_approx
aggregate function
URL: https://github.com/apache/incubator-doris/pull/1432#discussion_r302100579
##########
File path: be/src/exprs/aggregate_functions.cpp
##########
@@ -231,6 +232,81 @@ void AggregateFunctions::avg_update(FunctionContext* ctx,
const T& src, StringVa
++avg->count;
}
+struct PercentileApproxState {
+public:
+ PercentileApproxState() {
Review comment:
use Initializer list
```suggestion
PercentileApproxState() : digest(new TDigest()) {
```
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