fix: Only apply cast if needed when searching users for value

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/private/AllConfig.php

@@ -32,6 +32,7 @@
  */
 namespace OC;
 
+use Doctrine\DBAL\Platforms\OraclePlatform;
 use OCP\Cache\CappedMemoryCache;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\IConfig;
@@ -490,12 +491,15 @@ public function getUsersForUserValue($appName, $key, $value) {
 		$this->fixDIInit();
 
 		$qb = $this->connection->getQueryBuilder();
+		$configValueColumn = ($this->connection->getDatabasePlatform() instanceof OraclePlatform)
+			? $qb->expr()->castColumn('configvalue', IQueryBuilder::PARAM_STR)
+			: 'configvalue';
 		$result = $qb->select('userid')
 			->from('preferences')
 			->where($qb->expr()->eq('appid', $qb->createNamedParameter($appName, IQueryBuilder::PARAM_STR)))
 			->andWhere($qb->expr()->eq('configkey', $qb->createNamedParameter($key, IQueryBuilder::PARAM_STR)))
 			->andWhere($qb->expr()->eq(
-				$qb->expr()->castColumn('configvalue', IQueryBuilder::PARAM_STR),
+				$configValueColumn,
 				$qb->createNamedParameter($value, IQueryBuilder::PARAM_STR))
 			)->orderBy('userid')
 			->executeQuery();
@@ -524,13 +528,18 @@ public function getUsersForUserValueCaseInsensitive($appName, $key, $value) {
 			// Email address is always stored lowercase in the database
 			return $this->getUsersForUserValue($appName, $key, strtolower($value));
 		}
+
 		$qb = $this->connection->getQueryBuilder();
+		$configValueColumn = ($this->connection->getDatabasePlatform() instanceof OraclePlatform)
+			? $qb->expr()->castColumn('configvalue', IQueryBuilder::PARAM_STR)
+			: 'configvalue';
+
 		$result = $qb->select('userid')
 			->from('preferences')
 			->where($qb->expr()->eq('appid', $qb->createNamedParameter($appName, IQueryBuilder::PARAM_STR)))
 			->andWhere($qb->expr()->eq('configkey', $qb->createNamedParameter($key, IQueryBuilder::PARAM_STR)))
 			->andWhere($qb->expr()->eq(
-				$qb->func()->lower($qb->expr()->castColumn('configvalue', IQueryBuilder::PARAM_STR)),
+				$qb->func()->lower($configValueColumn),
 				$qb->createNamedParameter(strtolower($value), IQueryBuilder::PARAM_STR))
 			)->orderBy('userid')
 			->executeQuery();