[jira] [Created] (SPARK-21083) Consider staleness when collecting column stats

["Zhenhua Wang (JIRA)" <ji...@apache.org>]

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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