Knut Anders Hatlen created DERBY-6013:
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Summary: Assert failure with ORDER BY in UNION used in sub-query
Key: DERBY-6013
URL: https://issues.apache.org/jira/browse/DERBY-6013
Project: Derby
Issue Type: Bug
Components: SQL
Affects Versions: 10.9.1.0
Reporter: Knut Anders Hatlen
I see an assert failure when executing this sequence of statements using a
debug version of 10.9.1.0 or trunk:
ij version 10.9
ij> connect 'jdbc:derby:memory:db;create=true';
ij> create table t(x int);
0 rows inserted/updated/deleted
ij> create table u(x int);
0 rows inserted/updated/deleted
ij> insert into t values 1,2,3,4,5;
5 rows inserted/updated/deleted
ij> insert into u values 4,5,6,7;
4 rows inserted/updated/deleted
ij> select * from sysibm.sysdummy1 where exists ((select * from t) union
(select * from u where x = 4) order by x);
ERROR XJ001: Java exception: 'ASSERT FAILED getMatchingColumn() not expected to
be called for tableConstructor: false
all: false
nestedInParens: false
correlation Name: null
null
tableNumber 3
level 1
resultSetNumber: 0
referencedTableMap: null
statementResultSet: false
: org.apache.derby.shared.common.sanity.AssertFailure'.
Using a non-debug build makes it fail more gracefully:
ij> select * from sysibm.sysdummy1 where exists ((select * from t) union
(select * from u where x = 4) order by x);
ERROR 42X04: Column 'X' is either not in any table in the FROM list or appears
within a join specification and is outside the scope of the join specification
or appears in a HAVING clause and is not in the GROUP BY list. If this is a
CREATE or ALTER TABLE statement then 'X' is not a column in the target table.
However, I think the error message is misleading, as X is a valid column in the
query. Seen for example by executing the nested query as a top-level query:
ij> (select * from t) union all (select * from u where x = 4) order by x;
X
-----------
1
2
3
4
4
5
6 rows selected
However, possibly related, if I simply add parentheses around the working
query, it again fails with a complaint about the column X:
ij> ((select * from t) union all (select * from u where x = 4) order by x);
ERROR 42X78: Column 'X' is not in the result of the query expression.
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