@Override
    protected Float generateRandomNonNullValue(Random rand) {
      return (float) byteGenerator.generateRandomNonNullValue(rand);
    }
Base class for type specific batch generators. Each type specific batch generator implements
generateRandomNonNullValue to generate random values, and initializeFixedPointValues to
specify a set of fixed values within the data (this is useful when defining query predicates)
ql/src/test/org/apache/hadoop/hive/ql/exec/vector/util/OrcFileGenerator.java