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From "Jesus Camacho Rodriguez (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-17265) Cache merged column stats from retrieved partitions
Date Tue, 08 Aug 2017 01:48:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-17265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jesus Camacho Rodriguez updated HIVE-17265:
-------------------------------------------
    Attachment: HIVE-17265.patch

> 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.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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