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https://issues.apache.org/jira/browse/SPARK-20881?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li resolved SPARK-20881.
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Resolution: Fixed
Assignee: Zhenhua Wang
Fix Version/s: 2.3.0
> Clearly document the mechanism to choose between two sources of statistics
> --------------------------------------------------------------------------
>
> Key: SPARK-20881
> URL: https://issues.apache.org/jira/browse/SPARK-20881
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Zhenhua Wang
> Assignee: Zhenhua Wang
> Fix For: 2.3.0
>
>
> Currently in Spark, statistics are generated by "analyze" commands.
> When user updates the table and collects stats in Hive, "totalSize"/"numRows"
> will be updated in metastore.
> Then, in spark side, table stats becomes stale and is different from Hive's
> stats.
> This is expected. Currently, we have two sources of statistics, i.e. Spark's
> stats and Hive's stats. In our design, once Spark's stats is available, we
> respect it over Hive's stats.
> If a user generated stats at Spark side, it's his responsibility to update
> Spark's stats by re-running analyze commands.
> But we should clearly document in related code the mechanism to choose
> between these two sources of stats.
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