code: @Override
  	public void format(Buffer buf) {
  		int slotSize = RecordPage.slotSize(ti.schema());
  		Constant emptyFlag = new IntegerConstant(EMPTY);
  		for (int pos = 0; pos + slotSize <= Buffer.BUFFER_SIZE; pos += slotSize) {
  			setVal(buf, pos, emptyFlag);
  			makeDefaultRecord(buf, pos);
  		}
  	}
docs: Formats the page by allocating as many record slots as possible, given
  the record size. Each record slot is assigned a flag of EMPTY. Each
  numeric field is given a value of 0, and each string field is given a
  value of "".
  
  @see org.vanilladb.core.storage.buffer.PageFormatter#format(org.vanilladb.core.storage.buffer.Buffer)