[jira] [Updated] (SPARK-21083) Do not remove correct stats when re-analyze

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

     [ https://issues.apache.org/jira/browse/SPARK-21083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zhenhua Wang updated SPARK-21083:
---------------------------------
    Summary: Do not remove correct stats when re-analyze  (was: Consider staleness when collecting column stats)

> Do not remove correct stats when re-analyze
> -------------------------------------------
>
>                 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
>
> 1. When we first analyze without `noscan` and then analyze with `noscan`, the table is not changed, so we should keep row count in statistics.
> 2. When we first analyze one column in table and then analyze another column, the table is not changed, so we should keep the previous column stats and combine them with the newly collected column stats.



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