Zoltán Borók-Nagy created IMPALA-11003:
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Summary: Disallow schema evolution for migrated Iceberg tables
Key: IMPALA-11003
URL: https://issues.apache.org/jira/browse/IMPALA-11003
Project: IMPALA
Issue Type: Bug
Reporter: Zoltán Borók-Nagy
When external tables are converted to Iceberg, the data files remain intact.
This means that the old data files don't have field id information which is
essential for schema evolution.
Migrated tables are tagged with table property "MIGRATED_TO_ICEBERG". See
https://github.com/apache/hive/pull/2744/files
Hive disallows some schema changing operations, e.g. "replace col" and "change
col". See HIVE-25643.
Impala should also disallow delete column / change column. ADD COLUMN should be
fine.
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