Thanks All for the reactions. I wanted to emphasize that Hive's StatsObject was shared as an example with the suggestion to adapt it for iceberg - `PartitionColumnStats` (i.e. use column ids and drop name/type, etc).
As was mentioned by Rayan, column upper/lower bounds, counts, null value and NaN counts are tracked at file level. For the partition aggregates, we still need some compound object that could provide all values at once, precomputed, similar to basic stats - https://github.com/apache/iceberg/blob/main/core/src/main/java/org/apache/iceberg/PartitionStats.java WDYT?
