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https://issues.apache.org/jira/browse/HIVE-5849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13828229#comment-13828229
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Harish Butani commented on HIVE-5849:
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+1
> Improve the stats of operators based on heuristics in the absence of any
> column statistics
> ------------------------------------------------------------------------------------------
>
> Key: HIVE-5849
> URL: https://issues.apache.org/jira/browse/HIVE-5849
> Project: Hive
> Issue Type: Sub-task
> Components: Query Processor, Statistics
> Reporter: Prasanth J
> Assignee: Prasanth J
> Fix For: 0.13.0
>
> Attachments: HIVE-5849.1.patch.txt, HIVE-5849.2.patch.txt,
> HIVE-5849.3.patch, HIVE-5849.3.patch.txt, HIVE-5849.4.javaonly.patch,
> HIVE-5849.5.patch
>
>
> In the absence of any column statistics, operators will simply use the
> statistics from its parents. It is useful to apply some heuristics to update
> basic statistics (number of rows and data size) in the absence of any column
> statistics. This will be worst case scenario.
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