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https://issues.apache.org/jira/browse/HIVE-22591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vineet Garg reassigned HIVE-22591:
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> Make single metastore call to fetch all column stats instead of separate call
> for each column
> ---------------------------------------------------------------------------------------------
>
> Key: HIVE-22591
> URL: https://issues.apache.org/jira/browse/HIVE-22591
> Project: Hive
> Issue Type: Improvement
> Components: Query Planning
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Priority: Major
>
> Currently HiveRelFieldTrimmer has the ability to fetch (and trigger cache)
> column stats in single call.
> HiveReduceExpressionsWithStatsRule on the other hand has to use column stats
> on demand, as a result it makes single call for each column.
> This should be moved after RelFieldTrimmer so that RelFieldTrimmer has all
> the column stats cached.
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