some other fixes

Author: arthurpassos

src/Storages/Cache/ObjectStorageListObjectsCache.cpp

@@ -1,4 +1,5 @@
 #include <Storages/Cache/ObjectStorageListObjectsCache.h>
+#include <boost/functional/hash.hpp>
 
 namespace DB
 {
@@ -146,7 +147,12 @@ bool ObjectStorageListObjectsCache::Key::operator==(const Key & other) const
 
 size_t ObjectStorageListObjectsCache::KeyHasher::operator()(const Key & key) const
 {
-    return std::hash<String>()(key.prefix) + std::hash<String>()(key.bucket);
+    std::size_t seed = 0;
+
+    hash_combine(seed, std::hash<String>()(key.bucket));
+    hash_combine(seed, std::hash<String>()(key.prefix));
+
+    return seed;
 }
 
 bool ObjectStorageListObjectsCache::IsStale::operator()(const Key & key) const
@@ -160,7 +166,7 @@ size_t ObjectStorageListObjectsCache::WeightFunction::operator()(const Value & v
 
     for (const auto & object : value)
     {
-        weight += object->relative_path.size() + sizeof(ObjectMetadata);
+        weight += object->relative_path.capacity() + sizeof(ObjectMetadata);
     }
 
     return weight;