Victoria Markman created DRILL-2411:
---------------------------------------
Summary: 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: Query Planning & Optimization
Reporter: Victoria Markman
Assignee: Jinfeng Ni
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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