kou commented on code in PR #45350:
URL: https://github.com/apache/arrow/pull/45350#discussion_r1931950787
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cpp/src/parquet/properties.h:
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@@ -913,7 +913,8 @@ class PARQUET_EXPORT ArrowReaderProperties {
pre_buffer_(true),
cache_options_(::arrow::io::CacheOptions::LazyDefaults()),
coerce_int96_timestamp_unit_(::arrow::TimeUnit::NANO),
- arrow_extensions_enabled_(false) {}
+ arrow_extensions_enabled_(false),
+ should_load_statistics_(false) {}
Review Comment:
It's for performance.
The current implementation may concatenate multiple Parquet column data in
multiple row groups to one Arrow array. If we always load statistics, we can't
do it. Because we don't have statistics merge implementation. If we have a
statistics merge implementation, we can use `true` here. Because we can still
concatenate multiple Parquet column data in multiple row groups to one Arrow
array even when we load statistics.
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