use Hash#each to avoid a second hash lookup

activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb

@@ -283,10 +283,8 @@ def empty_insert_statement_value
         def select(sql, name = nil) #:nodoc:
           execute(sql, name).map do |row|
             record = {}
-            row.each_key do |key|
-              if key.is_a?(String)
-                record[key.sub(/^"?\w+"?\./, '')] = row[key]
-              end
+            row.each do |key, value|
+              record[key.sub(/^"?\w+"?\./, '')] = value if key.is_a?(String)
             end
             record
           end