Knut Anders Hatlen created DERBY-6024:
-----------------------------------------
Summary: Incorrect handling of NULL in IN lists
Key: DERBY-6024
URL: https://issues.apache.org/jira/browse/DERBY-6024
Project: Derby
Issue Type: Bug
Components: SQL
Affects Versions: 10.9.1.0
Reporter: Knut Anders Hatlen
I believe the following query should return null instead of false, as the IN
list contains an unknown value (null), so one cannot say definitely that it
doesn't contain 1:
ij> values 1 in (cast(null as int), 2);
1
-----
false
1 row selected
Per SQL:2003, part 2, 8.4 <in predicate>, syntax rules 2 and 5, the query is
equivalent to these two queries:
ij> values 1 in (values cast(null as int), 2);
1
-----
NULL
1 row selected
ij> values 1 = any (values cast(null as int), 2);
1
-----
NULL
1 row selected
They both return NULL, which I believe is the correct result for the first
query too.
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