Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/18248
`alterTable` can read states from the old table and keep it:
https://github.com/apache/spark/blob/master/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala#L564
basically `alterTable` should ignore the stats from input table metadata
and keep the stats as it was in the old table metadata.
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