public Delete addColumn(final byte[] family, final byte[] qualifier) {
    this.addColumn(family, qualifier, this.ts);
    return this;
  }
Delete the latest version of the specified column. This is an expensive call in that on the
server-side, it first does a get to find the latest versions timestamp. Then it adds a delete
using the fetched cells timestamp.
@param family    family name
@param qualifier column qualifier
@return this for invocation chaining
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Delete.java