ORDER BY with expression with distinct in the select list returns incorrect
result
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Key: DERBY-2351
URL: https://issues.apache.org/jira/browse/DERBY-2351
Project: Derby
Issue Type: Bug
Components: SQL
Affects Versions: 10.2.2.0, 10.3.0.0
Environment: Any
Reporter: Yip Ng
When distinct is in the select list and the query has order by with expression,
the resultset produced contains an additional column.
ij> create table t1 (c1 int, c2 varchar(10))
0 rows inserted/updated/deleted
ij> insert into t1 values (1,'a'),(2,'b'),(3,'c');
3 rows inserted/updated/deleted
select distinct c1, c2 from t1 order by c1;
C1 |C2
----------------------
1 |a
2 |b
3 |c
3 rows selected
ij> select distinct c1, c2 from t1 order by c1+1;
C1 |C2 |3 <=====returns 3
columns, incorrect result returned, should have thrown an error
----------------------------------
1 |a |2
2 |b |3
3 |c |4
3 rows selected
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