mapleFU commented on code in PR #34355:
URL: https://github.com/apache/arrow/pull/34355#discussion_r1150026872
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cpp/src/parquet/statistics.cc:
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@@ -495,9 +495,12 @@ class TypedStatisticsImpl : public TypedStatistics<DType> {
bool has_null_count, bool has_distinct_count,
MemoryPool* pool)
: TypedStatisticsImpl(descr, pool) {
TypedStatisticsImpl::IncrementNumValues(num_values);
+ // Currently, `has_null_count` argument is not used.
+ // Internal has_null_count_ would always be true.
Review Comment:
Sorry for make misunderstanding. NDV means num-different values. Load
statistics is introduced in `ColumnChunkMetaData`, and it's weird that:
1. Writer will never set ndv.
2. Reader should read ndv.
The behavior here is trickey
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