public Delete addColumns(final byte[] family, final byte[] qualifier, final long timestamp) {
    checkTimestamp(ts);
    List<ExtendedCell> list = getCellList(family);
    list.add(new KeyValue(this.row, family, qualifier, timestamp, KeyValue.Type.DeleteColumn));
    return this;
  }
Delete all versions of the specified column with a timestamp less than or equal to the
specified timestamp.
@param family    family name
@param qualifier column qualifier
@param timestamp maximum version timestamp
@return this for invocation chaining
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Delete.java