@Override
  public boolean hasRecordKey(String key) {
    return binarySearchOnKeys(key) > -1;
  }
<b>Segment Structure:</b>
<li>(25 byte: header)
<li>1 short: length, segment length
<li>1 short: freeAddr, start offset of records
<li>1 short: recordNum, amount of records in this segment
<li>1 short: pairLength, length of key-address in bytes
<li>1 long (8 bytes): prevSegIndex, previous segment index
<li>1 long (8 bytes): nextSegIndex, next segment index
<li>1 bit: delFlag, delete flag
<li>1 bit: aliasFlag, whether alias existed<br>
    (--- checksum, parent record address, max/min record key may be contained further ---)
<li><s>var length: key-address pairs, begin at 25 bytes offset, length of pairLength </s><br>
<li>var length: ORDERED record offset<br>
    ... empty space ...
<li>var length: (record key, record body) * recordNum
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/mtree/impl/pbtree/schemafile/WrappedSegment.java