mapleFU commented on code in PR #35989:
URL: https://github.com/apache/arrow/pull/35989#discussion_r1252197422
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cpp/src/parquet/statistics.cc:
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@@ -552,12 +556,17 @@ class TypedStatisticsImpl : public TypedStatistics<DType>
{
void Merge(const TypedStatistics<DType>& other) override {
this->num_values_ += other.num_values();
+ // Merge always runs when Merge builder's page statistics
+ // into column chunk statistics, so it usually has null count.
Review Comment:
> If Merge is called twice with other.HasNullCount()=false and then
other.HasNullCount()=true, here may have problem.
Why? If `other.HasNullCount()` called, the flag would never be true.
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