Zhenhua Wang created SPARK-21083:
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Summary: Consider staleness when collecting column stats
Key: SPARK-21083
URL: https://issues.apache.org/jira/browse/SPARK-21083
Project: Spark
Issue Type: Sub-task
Components: SQL
Affects Versions: 2.3.0
Reporter: Zhenhua Wang
Suppose we already collected column stats for some columns before, then, when
we collect column stats for other columns:
* If the table is changed during two collecting actions, we need to remove
these stale column stats, only keep the latest stats.
* Otherwise, combine these two sets of column stats.
Note that we always update sizeInBytes/rowCount when collecting column stats,
that logic doesn't need change.
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