Executing an if else query results to an infinite loop

Executing the following query on DB2:
select if (1 = 0 ) then 'a'; else 'b'; end if
generates an infinite loop generating the following message:

Warning qMakeFieldInfo: Unable to describe column 0 Error: [IBM][CLI Driver][DB2/LINUXX8664] SQL0104N An unexpected token "=" was found following "select if (1 ". Expected tokens may include: "CONCAT". SQLSTATE=42601

the index of the column is increasing constantly.

The problem seems to be that SQLSMALLINT count; is not initialized. After initializing it to zero the infinite loop and warning does not occur. Making the same query directly to db without Qt works fine.

qsql_db2.cpp in bool QDB2Result::exec()

..
SQLSMALLINT count;
r = SQLNumResultCols(d->hStmt, &count;);
if (count) {
setSelect(true);
for (int i = 0; i < count; ++i) {
d->recInf.append(qMakeFieldInfo(d, i));
}
} else {
setSelect(false);
}