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https://issues.apache.org/jira/browse/HIVE-2121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025614#comment-13025614
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Namit Jain commented on HIVE-2121:
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A few other comments:
1. The behavior should be reflected in explain plan extended.
Yongqiang recently added a similar plan change in pathtoAlias etc.
in HIVE-2126. Take a look as an example.
2. It would increase the utility if I can add a new session variable
where I specify the split percentage - this will be applicable to
all tables (this can also be done in a follow-up)
> 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, HIVE-2121.2.patch, HIVE-2121.3.patch,
> HIVE-2121.4.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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