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.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
