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Bryan Pendleton commented on DERBY-2351: ---------------------------------------- The SQL Standard appears to agree with the conclusion that queries such as those Yip has constructed should be rejected as invalid. Here's a brief synopsis of why I think the standard says this: - Section 14.1 (2003 standard) covers DECLARE CURSOR. - Syntax Rule 18 covers the ORDER BY clause - Syntax Rule 18.d.i covers the case in which the ORDER BY clause contains a sort key that contains a column reference to a column that is not a column of the result of the query expression - Syntax Rule 18.d.i.9.B.II states: QS shall not specify the <set quantifier> DISTINCT or directly contain one or more <set function specification>s. So I propose to modify the ORDER BY column checking so that it rejects such queries. > ORDER BY with expression with distinct in the select list returns incorrect > result > ---------------------------------------------------------------------------------- > > 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 > Assignee: Bryan Pendleton > Attachments: reproTests.diff > > > 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 > ---------------------------------- > 1 |a |2 > 2 |b |3 > 3 |c |4 > 3 rows selected -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.