Ashutosh Chauhan commented on HIVE-17265:

Can you please create a RB for this? Got some minor comments.

> Cache merged column stats from retrieved partitions
> ---------------------------------------------------
>                 Key: HIVE-17265
>                 URL: https://issues.apache.org/jira/browse/HIVE-17265
>             Project: Hive
>          Issue Type: Bug
>          Components: Statistics
>    Affects Versions: 3.0.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>         Attachments: HIVE-17265.02.patch, HIVE-17265.patch
> Currently when we retrieve stats from the metastore for a column in a 
> partitioned table, we will execute the logic to merge the column stats coming 
> from each partition multiple times.
> Even though we avoid multiple calls to metastore if the cache for the stats 
> in enabled, merging the stats for a given column can take a large amount of 
> time if there is a large number of partitions.

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