public void putToColumns(java.nio.ByteBuffer key, TCell val) {
    if (this.columns == null) {
      this.columns = new java.util.HashMap<java.nio.ByteBuffer,TCell>();
    }
    this.columns.put(key, val);
  }
Returns true if field row is set (has been assigned a value) and false otherwise
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift/generated/TRowResult.java