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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-21083) Consider staleness when collecting column stats
Date Tue, 13 Jun 2017 17:30:00 GMT

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

Apache Spark reassigned SPARK-21083:
------------------------------------

    Assignee:     (was: Apache Spark)

> Consider staleness when collecting column stats
> -----------------------------------------------
>
>                 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
>
> Suppose we already collected column stats for some columns before, then, when we collect
column stats for other columns:
> * If the table is changed during two collecting actions, we need to remove these stale
column stats, only keep the latest stats.
> * Otherwise, combine these two sets of column stats.
> Note that we always update sizeInBytes/rowCount when collecting column stats, that logic
doesn't need change.



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