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There is a newer version: 3.8.2.9

package water.fvec;

import water.*;
import water.util.UnsafeUtils;

/**
 * The empty-compression function, where data is in 'float's.
 */
public class C4FChunk extends Chunk {
  C4FChunk( byte[] bs ) { _mem=bs; _start = -1; set_len(_mem.length>>2); }
  @Override protected final long at8_impl( int i ) {
    float res = UnsafeUtils.get4f(_mem, i << 2);
    if( Float.isNaN(res) ) throw new IllegalArgumentException("at8_abs but value is missing");
    return (long)res;
  }
  @Override protected final double atd_impl( int i ) {
    float res = UnsafeUtils.get4f(_mem,i<<2);
    return Float.isNaN(res)?Double.NaN:res;
  }
  @Override protected final boolean isNA_impl( int i ) { return Float.isNaN(UnsafeUtils.get4f(_mem,i<<2)); }
  @Override boolean set_impl(int idx, long l) { return false; }
  @Override boolean set_impl(int i, double d) { return false; }
  @Override boolean set_impl(int i, float f ) {
    UnsafeUtils.set4f(_mem,i<<2,f);
    return true;
  }
  @Override boolean setNA_impl(int idx) { UnsafeUtils.set4f(_mem,(idx<<2),Float.NaN); return true; }
  @Override public NewChunk inflate_impl(NewChunk nc) {
    nc.set_sparseLen(0);
    nc.set_len(0);
    final int len = _len;
    for( int i=0; i>2);
    assert _mem.length == _len <<2;
  }
  @Override public boolean hasFloat() {return true;}
}