Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/18248
@cloud-fan Actually that is my first version.
It also has problems: if we generate spark's stats first (through analyze
command and `alterTableStats`), then do a regular alter table command, the
stats will lost. Because we don't store stats info (which is
from`CatalogStatistics`) through `alterTable`, and we don't know where the
stats info come from (hive or spark), so we can't decide whether to store the
stats or not in `alterTable`.
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