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https://issues.apache.org/jira/browse/HIVE-4584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13668047#comment-13668047
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Edward Capriolo commented on HIVE-4584:
---------------------------------------
{quote}
CREATE TABLE X (int y);
SELECT avg(y) from X ;
{quote}
I can make a test case to see if it happens in the test framework but real
world it happens quit often.
> CombineHiveInputFormat queries hang when table is empty and aggregation
> function is used
> ----------------------------------------------------------------------------------------
>
> Key: HIVE-4584
> URL: https://issues.apache.org/jira/browse/HIVE-4584
> Project: Hive
> Issue Type: Bug
> Reporter: Edward Capriolo
> Priority: Blocker
>
> Running hadoop 0.20.2. Hive 0.10. The new default is combined input format.
> When you aggregate and empty table, or a table not empty with an empty
> partition the query produces 0 maps and 1 reduce and hangs forever.
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