Bookmarks search not working in OC8 #131

{"reqId":"7f27997e0d1a4269fbcad40e11c207a2",
"remoteAddr":"190.31.13.117",
"app":"index",
"message":"Exception: {\"Message\":\"An exception occurred while executing 'SELECT * FROM (SELECT *,
 (select array_to_string(array_agg(\\\"tag\\\"),
',
')\\n\\t\\t\\t\\tfrom \\\"oc_bookmarks_tags\\\" where \\\"bookmark_id\\\" = \\\"b2\\\".\\\"id\\\") as \\\"tags\\\"\\n\\t\\t\\t\\tFROM \\\"oc_bookmarks\\\" \\\"b2\\\"\\n\\t\\t\\t\\tWHERE \\\"user_id\\\" = ? ) as \\\"b\\\" WHERE true  AND lower(url || title || description || ifnull(tags,
'') ) like ?  ORDER BY id DESC  LIMIT 10 OFFSET 0' with params [\\\"pega\\\",
 \\\"%django%\\\"]:\\n\\nSQLSTATE[42883]: Undefined function: 7 ERROR:  function ifnull(text,
 unknown) does not exist\\nLINE 4: ...RE true  AND lower(url || title || description || ifnull(tag...\\n                                                             ^\\nHINT:  No function matches the given name and argument types. You might need to add explicit type casts.\",
\"Code\":0,
\"Trace\":\"#0 \\\/var\\\/www\\\/mydomain.com\\\/www\\\/htdocs\\\/3rdparty\\\/doctrine\\\/dbal\\\/lib\\\/Doctrine\\\/DBAL\\\/DBALException.php(116): Doctrine\\\\DBAL\\\\Driver\\\\AbstractPostgreSQLDriver->convertException('An exception oc...',
 Object(Doctrine\\\\DBAL\\\\Driver\\\\PDOException))\\n#1 \\\/var\\\/www\\\/mydomain.com\\\/www\\\/htdocs\\\/3rdparty\\\/doctrine\\\/dbal\\\/lib\\\/Doctrine\\\/DBAL\\\/Statement.php(172): Doctrine\\\\DBAL\\\\DBALException::driverExceptionDuringQuery(Object(Doctrine\\\\DBAL\\\\Driver\\\\PDOPgSql\\\\Driver),
 Object(Doctrine\\\\DBAL\\\\Driver\\\\PDOException),
 'SELECT * FROM (...',
 Array)\\n#2 \\\/var\\\/www\\\/mydomain.com\\\/www\\\/htdocs\\\/lib\\\/private\\\/db\\\/statementwrapper.php(63): Doctrine\\\\DBAL\\\\Statement->execute(Array)\\n#3 \\\/var\\\/www\\\/mydomain.com\\\/www\\\/htdocs\\\/apps\\\/bookmarks\\\/controller\\\/lib\\\/bookmarks.php(177): OC_DB_StatementWrapper->execute(Array)\\n#4 \\\/var\\\/www\\\/mydomain.com\\\/www\\\/htdocs\\\/apps\\\/bookmarks\\\/controller\\\/lib\\\/search.php(42): OCA\\\\Bookmarks\\\\Controller\\\\Lib\\\\Bookmarks::findBookmarks('pega',
 Object(OC\\\\AppFramework\\\\Db\\\\Db),
 0,
 'id',
 'django',
 false)\\n#5 \\\/var\\\/www\\\/mydomain.com\\\/www\\\/htdocs\\\/lib\\\/private\\\/search.php(66): OCA\\\\Bookmarks\\\\Controller\\\\Lib\\\\Search->search('django')\\n#6 \\\/var\\\/www\\\/mydomain.com\\\/www\\\/htdocs\\\/core\\\/search\\\/ajax\\\/search.php(53): OC\\\\Search->searchPaged('django',
 Array,
 1,
 30)\\n#7 \\\/var\\\/www\\\/mydomain.com\\\/www\\\/htdocs\\\/lib\\\/private\\\/route\\\/route.php(135) : runtime-created function(1): require_once('\\\/var\\\/www\\\/mydomain...')\\n#8 [internal function]: __lambda_func(Array)\\n#9 \\\/var\\\/www\\\/mydomain.com\\\/www\\\/htdocs\\\/lib\\\/private\\\/route\\\/router.php(250): call_user_func('\\\\x00lambda_166453',
 Array)\\n#10 \\\/var\\\/www\\\/mydomain.com\\\/www\\\/htdocs\\\/lib\\\/base.php(763): OC\\\\Route\\\\Router->match('\\\/core\\\/search')\\n#11 \\\/var\\\/www\\\/mydomain.com\\\/www\\\/htdocs\\\/index.php(36): OC::handleRequest()\\n#12 {main}\",
\"File\":\"\\\/var\\\/www\\\/mydomain.com\\\/www\\\/htdocs\\\/3rdparty\\\/doctrine\\\/dbal\\\/lib\\\/Doctrine\\\/DBAL\\\/Driver\\\/AbstractPostgreSQLDriver.php\",
\"Line\":91}",
"level":4,
"time":"2015-03-03T07:27:25+00:00"}

Undefined function: 7 ERROR:  function ifnull(text,
 unknown) does not exist\\nLINE 4: ...RE true  AND lower(url || title || description || ifnull(tag...\\n                                                             ^\\nHINT:  No function matches the given name and argument types. You might need to add explicit type casts.\",
\"Code\":0,
\"Trace\":\"#0