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https://issues.apache.org/jira/browse/HIVE-7506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14087017#comment-14087017
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Lars Francke commented on HIVE-7506:
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Pengcheng, thanks for addressing my questions.
{quote}So, I will always post in https://reviews.apache.org/r/24289/ in the
future?{quote}
At least for this issue, yes. That way it's easy for us to compare different
versions of your patch and only review those parts again that have changed.
{quote}Tab policy as spaces only, Tab size -> 2
Is that enough?{quote}
That sounds correct but unfortunately I don't use Eclipse so I can't help there.
{quote}I have no idea about the authorization part either. I do not think I
have made any changes on that.{quote}
As mentioned I don't know either but I'm sure we'll find someone here who can
help (or at your end at Hortonworks). I'm sure that we'll want this to be
secured somehow.
Primitives/Objects: Thanks for the explanation, I'll take a look tomorrow.
I have taken another quick look at the patch. It looks much better but
unfortunately still contains a lot of "formal" errors but I'm sure we'll get
through them :) I'll try to continue the review tomorrow if no one else has
gotten to it before then.
> MetadataUpdater: provide a mechanism to edit the statistics of a column in a
> table (or a partition of a table)
> --------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-7506
> URL: https://issues.apache.org/jira/browse/HIVE-7506
> Project: Hive
> Issue Type: New Feature
> Components: Database/Schema
> Reporter: pengcheng xiong
> Assignee: pengcheng xiong
> Priority: Minor
> Attachments: HIVE-7506.1.patch, HIVE-7506.3.patch, HIVE-7506.4.patch,
> HIVE-7506.patch
>
> Original Estimate: 252h
> Remaining Estimate: 252h
>
> Two motivations:
> (1) Cost-based Optimizer (CBO) depends heavily on the statistics of a column
> in a table (or a partition of a table). If we would like to test whether CBO
> chooses the best plan under different statistics, it would be time consuming
> if we load the whole table and create the statistics from ground up.
> (2) As database runs, the statistics of a column in a table (or a partition
> of a table) may change. We need a way or a mechanism to synchronize.
> We propose the following command to achieve that:
> ALTER TABLE table_name PARTITION partition_spec [COLUMN col_name] UPDATE
> STATISTICS col_statistics [COMMENT col_comment]
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