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https://issues.apache.org/jira/browse/DRILL-2411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14528951#comment-14528951
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Victoria Markman commented on DRILL-2411:
-----------------------------------------
Verified fixed in: 0.9.0
#Sun May 03 18:33:43 EDT 2015
git.commit.id.abbrev=10833d2
Tests are checked in under:
Functional/Passing/aggregation/bugs/drill-2411-[1234].sql
> Scalar SUM/AVG over empty result set returns no rows instead of NULL
> --------------------------------------------------------------------
>
> Key: DRILL-2411
> URL: https://issues.apache.org/jira/browse/DRILL-2411
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Relational Operators
> Reporter: Victoria Markman
> Assignee: Mehant Baid
> Priority: Critical
> Fix For: 1.0.0
>
>
> Queries below should return NULL:
> {code}
> 0: jdbc:drill:schema=dfs> select sum(a2) from t2 where 1=0;
> +------------+
> | EXPR$0 |
> +------------+
> +------------+
> No rows selected (0.08 seconds)
> 0: jdbc:drill:schema=dfs> select avg(a2) from t2 where 1=0;
> +------------+
> | EXPR$0 |
> +------------+
> +------------+
> No rows selected (0.074 seconds)
> {code}
> When grouped, result is correct:
> {code}
> 0: jdbc:drill:schema=dfs> select a2, sum(a2) from t2 where 1=0 group by a2;
> +------------+------------+
> | a2 | EXPR$1 |
> +------------+------------+
> +------------+------------+
> No rows selected (0.11 seconds)
> {code}
> I'm not convinced and it is not very intuitive that correct result should be
> NULL, but this is what postgres returns and Aman thinks NULL is the correct
> behavior :)
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