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Posted to dev@hive.apache.org by "Siying Dong (JIRA)" <ji...@apache.org> on 2011/04/20 02:46:05 UTC

[jira] [Commented] (HIVE-2121) Input Sampling By Splits

    [ https://issues.apache.org/jira/browse/HIVE-2121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13021878#comment-13021878 ] 

Siying Dong commented on HIVE-2121:
-----------------------------------

still need to modify some test results.

> Input Sampling By Splits
> ------------------------
>
>                 Key: HIVE-2121
>                 URL: https://issues.apache.org/jira/browse/HIVE-2121
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: Siying Dong
>            Assignee: Siying Dong
>         Attachments: HIVE-2121.1.patch
>
>
> We need a better input sampling to serve at least two purposes:
> 1. test their queries against a smaller data set
> 2. understand more about how the data look like without scanning the whole table.
> A simple function that gives a subset splits will help in those cases. It doesn't have to be strict sampling.

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