[jira] [Commented] (HIVE-12960) Migrate Column Stats Extrapolation to HBaseStore

["Pengcheng Xiong (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-12960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15140418#comment-15140418 ] 

Pengcheng Xiong commented on HIVE-12960:
----------------------------------------

[~sershe], i just submitted the initial patch. I agree that we should (1) move the logic out of directsql and (2) it would be the best if ObjectStore and HbaseStore can share the code for the extrapolation logic. However, after some investigation, i found it would be hard to do (2). The main reason is that, in ObjectStore, in order to save the times to call metastore, we include lots of logic inside SQL itself, e.g., use sum and avg function in SQL to calculate the sum and the average. However, we have to write our own code in HBaseStore. And, for (1), I would suggest that we open a new JIRA to address it. Also cc'ing [~ashutoshc] to listen to his opinions.

> Migrate Column Stats Extrapolation to HBaseStore
> ------------------------------------------------
>
>                 Key: HIVE-12960
>                 URL: https://issues.apache.org/jira/browse/HIVE-12960
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>             Fix For: 2.1.0
>
>         Attachments: HIVE-12960.01.patch
>
>




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