Function hllSparseAdd

src/hyperloglog.cpp:911–916

"Add" the element in the sparse hyperloglog data structure. * Actually nothing is added, but the max 0 pattern counter of the subset * the element belongs to is incremented if needed. * * This function is actually a wrapper for hllSparseSet(), it only performs * the hashshing of the element to obtain the index and zeros run length. */

 * This function is actually a wrapper for hllSparseSet(), it only performs
 * the hashshing of the element to obtain the index and zeros run length. */
int hllSparseAdd(robj *o, unsigned char *ele, size_t elesize) {
    long index;
    uint8_t count = hllPatLen(ele,elesize,&index);
    /* Update the register if this element produced a longer run of zeroes. */
    return hllSparseSet(o,index,count);
}

/* Compute the register histogram in the sparse representation. */
void hllSparseRegHisto(uint8_t *sparse, int sparselen, int *invalid, int* reghisto) {