[C++] Add arrow::ArrayStatistics

[kou]

Describe the enhancement requested

An Arrow array doesn't have statistics but Arrow array source such as Parquet column may have statistics.
We can get the source statistics via source reader such as parquet::ColumnChunkMetaData::statistics() (parquet::ParquetFileReader::metadata()->RowGroup(X)->ColumnChunk(Y)->statistics()) but can't get read Arrow array (e.g. parquet::arrow::FileReader::ReadColumn()).

How about adding arrow::ArrayStatistics or something and attaching source statistics to arrow::Array?

Component(s)

C++

[llama90]

I think this is a great idea.

Adding arrow::ArrayStatistics and connecting source statistics to arrow::Array will help users get and use statistics directly from Arrow arrays.

This can make Arrow easier to use, especially for people working with data sources like Parquet that have statistics.

[kou]

The mailing list discussion: https://lists.apache.org/thread/kcpyq9npnh346pw90ljwbg0wxq6hwxxh