[jira] [Created] (DERBY-6408) EXISTS returns NULL instead of FALSE

["Knut Anders Hatlen (JIRA)" <ji...@apache.org>]

Knut Anders Hatlen created DERBY-6408:
-----------------------------------------

             Summary: EXISTS returns NULL instead of FALSE
                 Key: DERBY-6408
                 URL: https://issues.apache.org/jira/browse/DERBY-6408
             Project: Derby
          Issue Type: Bug
          Components: SQL
    Affects Versions: 10.10.1.1
            Reporter: Knut Anders Hatlen


The reference manual topic on Boolean expressions - http://db.apache.org/derby/docs/10.10/ref/rrefsqlj23075.html - says that EXISTS should return FALSE if the subquery returns no rows. In reality, it returns NULL:

ij> create table t(x int);
0 rows inserted/updated/deleted
ij> values exists(select * from t);
1    
-----
NULL 

1 row selected

SQL:2011, part 2, 8.10 <exists predicate> also says that FALSE is the correct result if the cardinality is 0.



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