public int getVariableSize(int batchSize) {
    int variableSize = 0;
    if ( 0 < stringIndices.length) {
      for (int k=0; k<batchSize; ++k) {
        VectorHashKeyWrapperBase hkw = vectorHashKeyWrappers[k];
        variableSize += hkw.getVariableSize();
      }
    }
    return variableSize;
  }
Get the row-mode writable object value of a key from a key wrapper
@param keyOutputWriter
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/wrapper/VectorHashKeyWrapperBatch.java