Vihang Karajgaonkar created HIVE-24987:
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Summary: hive.metastore.disallow.incompatible.col.type.changes is
too restrictive for some storage formats
Key: HIVE-24987
URL: https://issues.apache.org/jira/browse/HIVE-24987
Project: Hive
Issue Type: Improvement
Reporter: Vihang Karajgaonkar
Currently when {{hive.metastore.disallow.incompatible.col.type.changes}} is set
to true it disallows any schema changes which are deemed as backwards
incompatible e.g dropping a column of a table. While this may be a correct
thing to do for Parquet or Orc tables, it is too restrictive for storage
formats like Kudu.
Currently, for Kudu tables, Impala supports dropping a column. But if we set
this config to true metastore disallows changing the schema of the metastore
table. I am assuming this would be problematic for Iceberg tables too which
supports such schema changes.
The proposal is to have a new configuration which provided a exclusion list of
the table fileformat where this check will be skipped. Currently, we will only
include Kudu tables to skip this check.
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