[jira] Commented: (HIVE-124) aggregation on empty table should still return 1 row

["Prasad Chakka (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681840#action_12681840 ] 

Prasad Chakka commented on HIVE-124:
------------------------------------

+1

> aggregation on empty table should still return 1 row
> ----------------------------------------------------
>
>                 Key: HIVE-124
>                 URL: https://issues.apache.org/jira/browse/HIVE-124
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Zheng Shao
>            Assignee: Namit Jain
>            Priority: Blocker
>         Attachments: hive.124.1.patch
>
>
> The query  "SELECT COUNT(1) FROM f_status_update fsu WHERE FALSE" should return a single row with value 0.
> Our code treat that query as "SELECT 1, COUNT(1) FROM f_status_update fsu WHERE FALSE GROUP BY 1", but these 2 queries are not equivalent because the second query will return empty result if the input is empty.

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