Fix greatest/least order for oracle

lib/private/DB/QueryBuilder/FunctionBuilder/OCIFunctionBuilder.php

@@ -24,9 +24,52 @@
 namespace OC\DB\QueryBuilder\FunctionBuilder;
 
 use OC\DB\QueryBuilder\QueryFunction;
+use OCP\DB\QueryBuilder\ILiteral;
+use OCP\DB\QueryBuilder\IParameter;
+use OCP\DB\QueryBuilder\IQueryFunction;
 
 class OCIFunctionBuilder extends FunctionBuilder {
 	public function md5($input) {
 		return new QueryFunction('LOWER(DBMS_OBFUSCATION_TOOLKIT.md5 (input => UTL_RAW.cast_to_raw(' . $this->helper->quoteColumnName($input) .')))');
 	}
+
+	/**
+	 * As per https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions060.htm
+	 * Oracle uses the first value to cast the rest or the values. So when the
+	 * first value is a literal, plain value or column, instead of doing the
+	 * math, it will cast the expression to int and continue with a "0". So when
+	 * the second parameter is a function or column, we have to put that as
+	 * first parameter.
+	 *
+	 * @param string|ILiteral|IParameter|IQueryFunction $x
+	 * @param string|ILiteral|IParameter|IQueryFunction $y
+	 * @return QueryFunction
+	 */
+	public function greatest($x, $y) {
+		if (is_string($y) || $y instanceof IQueryFunction) {
+			return parent::greatest($y, $x);
+		}
+
+		return parent::greatest($x, $y);
+	}
+
+	/**
+	 * As per https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions060.htm
+	 * Oracle uses the first value to cast the rest or the values. So when the
+	 * first value is a literal, plain value or column, instead of doing the
+	 * math, it will cast the expression to int and continue with a "0". So when
+	 * the second parameter is a function or column, we have to put that as
+	 * first parameter.
+	 *
+	 * @param string|ILiteral|IParameter|IQueryFunction $x
+	 * @param string|ILiteral|IParameter|IQueryFunction $y
+	 * @return QueryFunction
+	 */
+	public function least($x, $y) {
+		if (is_string($y) || $y instanceof IQueryFunction) {
+			return parent::least($y, $x);
+		}
+
+		return parent::least($x, $y);
+	}
 }

lib/private/Files/Cache/Propagator.php

@@ -104,9 +104,9 @@ public function propagateChange($internalPath, $time, $sizeDifference = 0) {
 			$builder = $this->connection->getQueryBuilder();
 			$builder->update('filecache')
 				->set('size', $builder->func()->greatest(
-					$builder->createNamedParameter(-1, IQueryBuilder::PARAM_INT),
-					$builder->func()->add('size', $builder->createNamedParameter($sizeDifference)))
-				)
+					$builder->func()->add('size', $builder->createNamedParameter($sizeDifference)),
+					$builder->createNamedParameter(-1, IQueryBuilder::PARAM_INT)
+				))
 				->where($builder->expr()->eq('storage', $builder->createNamedParameter($storageId, IQueryBuilder::PARAM_INT)))
 				->andWhere($builder->expr()->in('path_hash', $hashParams))
 				->andWhere($builder->expr()->gt('size', $builder->expr()->literal(-1, IQueryBuilder::PARAM_INT)));
@@ -168,7 +168,7 @@ public function commitBatch() {
 		$storageId = (int)$this->storage->getStorageCache()->getNumericId();
 
 		$query->update('filecache')
-			->set('mtime', $query->createFunction('GREATEST(' . $query->getColumnName('mtime') . ', ' . $query->createParameter('time') . ')'))
+			->set('mtime', $query->func()->greatest('mtime', $query->createParameter('time')))
 			->set('etag', $query->expr()->literal(uniqid()))
 			->where($query->expr()->eq('storage', $query->expr()->literal($storageId, IQueryBuilder::PARAM_INT)))
 			->andWhere($query->expr()->eq('path_hash', $query->createParameter('hash')));