szlta opened a new pull request #2577:
URL: https://github.com/apache/hive/pull/2577


   Currently ALTER TABLE CHANGE COLUMN statement only updates the 
Iceberg-backed table's schema, but not it's partition spec. Updating the spec 
is required to allow subsequent partition spec changes (like set partition spec 
calls) to succeed.
   
   Note: to do this in HiveIcebergMetaHook class we can't just create an 
updateSchema and an updatePartitionSpec object, do the modifications and commit 
both of them, as the last commit will fail due to invalid base. We might want 
to do this in two separate steps instead.


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