made the result set object act more like an array

activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb

@@ -225,7 +225,7 @@ module ActiveRecord
       # column values as values.
       def select(sql, name = nil, binds = [])
         binds = binds.dup
-        exec_query(sql.gsub("\0") { quote(*binds.shift.reverse) }, name).to_a
+        exec_query(sql.gsub("\0") { quote(*binds.shift.reverse) }, name)
       end
 
       def insert_sql(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)

activerecord/lib/active_record/connection_adapters/mysql_adapter.rb

@@ -408,7 +408,7 @@ module ActiveRecord
 
       def select(sql, name = nil, binds = [])
         @connection.query_with_result = true
-        rows = exec_query(sql, name, binds).to_a
+        rows = exec_query(sql, name, binds)
         @connection.more_results && @connection.next_result    # invoking stored procedures with CLIENT_MULTI_RESULTS requires this to tidy up else connection will be dropped
         rows
       end

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -1249,7 +1249,7 @@ module ActiveRecord
         # Executes a SELECT query and returns the results, performing any data type
         # conversions that are required to be performed here instead of in PostgreSQLColumn.
         def select(sql, name = nil, binds = [])
-          exec_query(sql, name, binds).to_a
+          exec_query(sql, name, binds)
         end
 
         def select_raw(sql, name = nil)

activerecord/lib/active_record/querying.rb

@@ -35,7 +35,8 @@ module ActiveRecord
     #   > [#<Post:0x36bff9c @attributes={"title"=>"The Cheap Man Buys Twice"}>, ...]
     def find_by_sql(sql, binds = [])
       logging_query_plan do
-        connection.select_all(sanitize_sql(sql), "#{name} Load", binds).collect! { |record| instantiate(record) }
+        result_set = connection.select_all(sanitize_sql(sql), "#{name} Load", binds)
+        result_set.map! { |record| instantiate(record) }
       end
     end
 

activerecord/lib/active_record/result.rb

@@ -24,6 +24,25 @@ module ActiveRecord
       hash_rows
     end
 
+    alias :map! :map
+    alias :collect! :map
+
+    def empty?
+      rows.empty?
+    end
+
+    def to_ary
+      hash_rows
+    end
+
+    def [](idx)
+      hash_rows[idx]
+    end
+
+    def last
+      hash_rows.last
+    end
+
     private
     def hash_rows
       @hash_rows ||= @rows.map { |row|