Optimize RocksDb startup (neo-project#333)

src/RocksDBStore/Plugins/Storage/Store.cs

@@ -20,8 +20,16 @@ internal class Store : IStore
  public Store(string path)
  {
  var families = new ColumnFamilies();
- for (int x = 0; x <= byte.MaxValue; x++)
- families.Add(new ColumnFamilies.Descriptor(x.ToString(), new ColumnFamilyOptions()));
+
+ try
+ {
+ foreach (var family in RocksDb.ListColumnFamilies(Options.Default, Path.GetFullPath(path)))
+ {
+ families.Add(new ColumnFamilies.Descriptor(family, new ColumnFamilyOptions()));
+ }
+ }
+ catch { }
+
  db = RocksDb.Open(Options.Default, Path.GetFullPath(path), families);
 
  ColumnFamilyHandle defaultFamily = db.GetDefaultColumnFamily();