int newThreshold = 1 + (int) (newCapacity * loadFactor);
    int[] newTable = newTable(newCapacity);
    long[] entries = this.entries;

    int mask = newTable.length - 1;
    for (int i = 0; i < size; i++) {
      long oldEntry = entries[i];
      int hash = getHash(oldEntry);
      int tableIndex = hash & mask;
      int next = newTable[tableIndex];
      newTable[tableIndex] = i;

        int newNext = CompactHashing.tableGet(newTable, newTableIndex);
        CompactHashing.tableSet(newTable, newTableIndex, oldNext);
        entries[entryIndex] = CompactHashing.maskCombine(hash, newNext, newMask);

        oldNext = CompactHashing.getNext(oldEntry, oldMask);
      }
    }

    this.table = newTable;
    setHashTableMask(newMask);
    return newMask;
  }

        int newNext = CompactHashing.tableGet(newTable, newTableIndex);
        CompactHashing.tableSet(newTable, newTableIndex, oldNext);
        entries[entryIndex] = CompactHashing.maskCombine(hash, newNext, newMask);

        oldNext = CompactHashing.getNext(oldEntry, oldMask);
      }
    }

    this.table = newTable;
    setHashTableMask(newMask);
    return newMask;
  }

	var oldTable, newTable interface{}
	if v, ok := oldName.(string); ok {
		oldTable = clause.Table{Name: v}
	} else {
		stmt := &gorm.Statement{DB: m.DB}
		if err := stmt.Parse(oldName); err == nil {
			oldTable = m.CurrentTable(stmt)
		} else {
			return err
		}
	}

	if v, ok := newName.(string); ok {
		newTable = clause.Table{Name: v}
	} else {