Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/18334
@rxin Currently we are re-calculating the stats. If we want to support
incremental stats update, we may need to maintain some specific data
structures. e.g. for ndv in column stats, store data structure for
`HyperLogLogPlusPlus`. These structures are stored per column and table, which
could cause considerable memory cost if stored in memory (and nonpersistent).
If we want to persist them, there's also a problem given that currently
metastore doesn't provide such APIs.
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