HBase - Phoenix returns more than one result for subquery which should return only one row ------------------------------------------------------------------------------------------- Key: TEIID-3772 URL: https://issues.jboss.org/browse/TEIID-3772 Project: Teiid Issue Type: Bug Affects Versions: 8.7.1.6_2 Reporter: Juraj Duráni Assignee: Steven Hawkins Priority: Minor Query: SELECT intkey FROM BQT1.SmallA AS A WHERE stringkey = (SELECT stringkey FROM BQT1.SmallA AS B WHERE b.intnum = a.intnum) ORDER BY intkey Source-specific query: SELECT g_0.intkey AS c_0 FROM smalla AS g_0 WHERE g_0.stringkey = (SELECT g_1.stringkey FROM smalla AS g_1 WHERE g_1.intnum = g_0.intnum) ORDER BY c_0 Subquery returns more than one row. Every value in IntNum is unique except 3 NULL values. Changing where clause to: WHERE b.intnum is not null and b.intnum = a.intnum returns correct result. It seems like Phoenix bug. A note in the documentation could be enough.