Fixed dataset initialization speed on Linux if thread affinity was used.

src/backend/common/Worker.h

@@ -50,6 +50,7 @@ public:
 protected:
     void storeStats();
 
+    const int64_t m_affinity;
     const size_t m_id;
     std::atomic<uint64_t> m_hashCount;
     std::atomic<uint64_t> m_timestamp;