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https://issues.apache.org/jira/browse/HIVE-15397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Shelukhin updated HIVE-15397:
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Description: Queries like select 1=1 from t group by 1=1 may return rows,
based on OneNullRowInputFormat, even if the source table is empty. For now, add
some basic detection of empty tables and turn this off by default (since we
can't know whether a table is empty or not based on there being some files,
without reading them). (was: Queries like select 1=1 from t group by 1=1 may
return rows, based on OneNullRowInputFormat, even if the source table is empty.)
> metadata-only queries may return incorrect results with empty tables - I
> ------------------------------------------------------------------------
>
> Key: HIVE-15397
> URL: https://issues.apache.org/jira/browse/HIVE-15397
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-15397.patch
>
>
> Queries like select 1=1 from t group by 1=1 may return rows, based on
> OneNullRowInputFormat, even if the source table is empty. For now, add some
> basic detection of empty tables and turn this off by default (since we can't
> know whether a table is empty or not based on there being some files, without
> reading them).
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