alamb commented on issue #264:
URL: https://github.com/apache/arrow-rs/issues/264#issuecomment-834685843
I tried to see what postgres kept for statistics, and it turns out it keeps
histograms not just min/max:
```
alamb=# select * from example;
a
-----
1
2
3
NaN
(4 rows)
alamb=# select * from pg_stats where tablename = 'example';
schemaname | tablename | attname | inherited | null_frac | avg_width |
n_distinct | most_common_vals | most_common_freqs | histogram_bounds |
correlation | most_common_elems | most_common_elem_freqs | elem_count_histogram
------------+-----------+---------+-----------+-----------+-----------+------------+------------------+-------------------+------------------+-------------+-------------------+------------------------+----------------------
public | example | a | f | 0 | 8 |
-1 | | | {1,2,3,NaN} | 1 |
| |
(1 row)
```
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