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https://issues.apache.org/jira/browse/HIVE-12640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15051586#comment-15051586
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Julian Hyde commented on HIVE-12640:
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If {{src}} is empty, according to the SQL standard, should {code} select
count('1') from src group by '1'{code} and {code} select count('1') from
src{code} return the same result? My understanding is that the first should
return 1 row, the second 0 rows.
> Allow StatsOptimizer to optimize the query for Constant GroupBy keys
> ---------------------------------------------------------------------
>
> Key: HIVE-12640
> URL: https://issues.apache.org/jira/browse/HIVE-12640
> Project: Hive
> Issue Type: Bug
> Reporter: Hari Sankar Sivarama Subramaniyan
> Assignee: Hari Sankar Sivarama Subramaniyan
> Attachments: HIVE-12640.1.patch
>
>
> {code}
> hive> select count('1') from src group by '1';
> {code}
> In the above query, while performing StatsOptimizer optimization we can
> safely ignore the group by on the constant key '1' since the above query will
> return the same result as "select count('1') from src".
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