PartitionStatsUtil#computeStats returns incomplete stats in case of partition evolution

[deniskuzZ]

Apache Iceberg version

1.7.0, 1.7.1, main

Query engine

None

Please describe the bug 🐞

Description:
PartitionMap creates internal wrappers based on table specs partitionType, however, we are passing coercedPartition with unified partition type considering all specs as a KEY, leading to wrong evaluation.

Repro:
https://github.com/apache/hive/blob/master/iceberg/iceberg-handler/src/test/queries/positive/iceberg_bucket_map_join_4.q

Willingness to contribute

• I can contribute a fix for this bug independently
• I would be willing to contribute a fix for this bug with guidance from the Iceberg community
• I cannot contribute a fix for this bug at this time

[deniskuzZ]

#12137