Fix facebook#26 by putting the implementation of CreateDBStatistics()…

… to a cc file

db/db_statistics.cc

@@ -0,0 +1,14 @@
+//  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under the BSD-style license found in the
+//  LICENSE file in the root directory of this source tree. An additional grant
+//  of patent rights can be found in the PATENTS file in the same directory.
+
+#include "db/db_statistics.h"
+
+namespace rocksdb {
+
+std::shared_ptr<Statistics> CreateDBStatistics() {
+  return std::make_shared<DBStatistics>();
+}
+
+} // namespace rocksdb

db/db_statistics.h

@@ -58,8 +58,6 @@ class DBStatistics: public Statistics {
   std::vector<HistogramImpl> allHistograms_;
 };
 
-std::shared_ptr<Statistics> CreateDBStatistics() {
-  return std::make_shared<DBStatistics>();
-}
+std::shared_ptr<Statistics> CreateDBStatistics();
 
 } // namespace rocksdb

table/table_test.cc

@@ -1047,7 +1047,7 @@ TEST(TableTest, BlockCacheTest) {
 
   // -- PART 2: Open without block cache
   options.block_cache.reset();
-  options.statistics = CreateDBStatistics();  // reset the props
+  options.statistics = CreateDBStatistics();  // reset the stats
   c.Reopen(options);
 
   {