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https://issues.apache.org/jira/browse/HIVE-6797?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Prasanth J updated HIVE-6797:
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Attachment: HIVE-6797.2.patch
The first check isn't necessary as it doesn't protection against the divide by
zero in downstream operators. Also having the first check will affect PARTIAL
basicStatsState cases that are seen in the test failures. Removed the
unnecessary check in this patch.
> Add protection against divide by zero in stats annotation
> ---------------------------------------------------------
>
> Key: HIVE-6797
> URL: https://issues.apache.org/jira/browse/HIVE-6797
> Project: Hive
> Issue Type: Sub-task
> Components: Query Processor, Statistics
> Affects Versions: 0.13.0
> Reporter: Prasanth J
> Assignee: Prasanth J
> Fix For: 0.13.0
>
> Attachments: HIVE-6797.1.patch, HIVE-6797.2.patch
>
>
> In stats annotation, the denominator computation in join operator is not
> protected for divide by zero exception. It will be an issue when NDV (count
> distinct) updated by updateStats() becomes 0. This patch adds protection in
> updateStats() method to prevent divide-by-zero in downstream operators.
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