Method exec

src/org/apache/pig/impl/builtin/GetMemNumRows.java:48–69

@param in - input tuple @return - tuple having size in memory of this tuple and numRows if this is specially marked tuple having number of rows field

(Tuple in)

     * is specially marked tuple having number of rows field 
     */    
    public Tuple exec(Tuple in) throws IOException {
    	if (in == null) {
    	    return null;
    	}
    	long memSize = in.getMemorySize();
    	long numRows = 0;

    	
    	//  if this is specially marked tuple, get the number of rows
        int tSize = in.size();
    	if(tSize >=2 && 
    	    PoissonSampleLoader.NUMROWS_TUPLE_MARKER.equals(in.get(tSize-2)) ){
    	    memSize -= SizeUtil.getPigObjMemSize(PoissonSampleLoader.NUMROWS_TUPLE_MARKER);
    	    numRows = (Long)in.get(tSize-1);
    	}
    	
    	//create tuple to be returned
    	Tuple t = factory.newTuple(2);
    	t.set(0, memSize);
    	t.set(1, numRows);
    	return t;
    }
    
    public Type getReturnType(){
        return Tuple.class;