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