public checkAndDelete_args setValue(@org.apache.thrift.annotation.Nullable java.nio.ByteBuffer value) {
      this.value = org.apache.thrift.TBaseHelper.copyBinary(value);
      return this;
    }
the expected value, if not provided the
check is for the non-existence of the
column in question
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift2/generated/THBaseService.java