HIVE-27448: Hive Iceberg: Merge column stats #4431
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… reviewed by Denys Kuzmenko, Krisztian Kasa, Sourabh Badhya) Closes apache#4431
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What changes were proposed in this pull request?
Why are the changes needed?
Hive only calculates the col stats for the rows inserted in a query.
We will need to merge these stats with the existing stats of the table to get the accurate values.
Does this PR introduce any user-facing change?
Is the change a dependency upgrade?
How was this patch tested?
Unit test: TestHiveIcebergColStats
qtests