Read from and write to different column families

Summary: This one is big. It adds ability to write to and read from different column families (see the unit test). It also supports recovery of different column families from log, which was the hardest part to reason about. We need to make sure to never delete the log file which has unflushed data from any column family. To support that, I added another concept, which is versions_->MinLogNumber()

Test Plan: Added a unit test in column_family_test

Reviewers: dhruba, haobo, sdong, kailiu

CC: leveldb

Differential Revision: https://reviews.facebook.net/D15537

db/write_batch_internal.h

@@ -17,6 +17,11 @@ namespace rocksdb {
 
 class MemTable;
 
+class ColumnFamilyMemTables {
+ public:
+  virtual MemTable* GetMemTable(uint32_t column_family_id) = 0;
+};
+
 // WriteBatchInternal provides static methods for manipulating a
 // WriteBatch that we don't want in the public WriteBatch interface.
 class WriteBatchInternal {
@@ -51,6 +56,11 @@ class WriteBatchInternal {
                            const Options* opts, DB* db = nullptr,
                            const bool filter_del = false);
 
+  static Status InsertInto(const WriteBatch* batch,
+                           ColumnFamilyMemTables* memtables,
+                           const Options* opts, DB* db = nullptr,
+                           const bool filter_del = false);
+
   static void Append(WriteBatch* dst, const WriteBatch* src);
 };