Rick Hillegas created DERBY-5875:
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Summary: Derby returns wrong results when you set the ESCAPE
character to NULL in a LIKE clause.
Key: DERBY-5875
URL: https://issues.apache.org/jira/browse/DERBY-5875
Project: Derby
Issue Type: Bug
Components: SQL
Affects Versions: 10.10.0.0
Reporter: Rick Hillegas
The LIKE clause is supposed to evaluate to NULL if the optional ESCAPE
character is set to NULL. Instead, Derby treats this condition as equivalent to
omitting the ESCAPE clause. This violates part 2 of the SQL Standard, section
8.5 <like predicate>, general rule 3.a.ii.
Thanks to Knut for disclosing this problem via the following script:
connect 'jdbc:derby:memory:db;create=true';
prepare ps as 'select tablename from sys.systables where tablename like
''SYSD%'' escape ?';
-- should return no rows, but actually returns 2
execute ps using 'values cast( null as char(1) )';
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