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hllSparseToDense API changed to take ref to object.

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The new API takes directly the object doing everything needed to
turn it into a dense representation, including setting the new
representation as object->ptr.
This commit is contained in:
antirez 2014-04-13 22:59:27 +02:00
parent 2067644a8c
commit e8e717e145
1 changed files with 10 additions and 6 deletions
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16
src/hyperloglog.c
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@ -560,12 +560,16 @@ double hllDenseSum(uint8_t *registers, double *PE, int *ezp) {
/* Convert the HLL with sparse representation given as input in its dense
* representation. Both representations are represented by SDS strings, and
* the input representation is freed as a side effect. */
sds hllSparseToDense(sds sparse) {
sds dense;
void hllSparseToDense(robj *o) {
sds sparse = o->ptr, dense;
struct hllhdr *hdr, *oldhdr = (struct hllhdr*)sparse;
int idx = 0, runlen, regval;
uint8_t *p = (uint8_t*)sparse, *end = p+sdslen(sparse);
/* If the representation is already the right one return ASAP. */
hdr = (struct hllhdr*) sparse;
if (hdr->encoding == HLL_DENSE) return;
/* Create a string of the right size filled with zero bytes.
* Note that the cached cardinality is set to 0 as a side effect
* that is exactly the cardinality of an empty HLL. */
@ -597,9 +601,9 @@ sds hllSparseToDense(sds sparse) {
}
}
/* Free the old representation and return the new one. */
sdsfree(sparse);
return dense;
/* Free the old representation and set the new one. */
sdsfree(o->ptr);
o->ptr = dense;
}
/* "Add" the element in the sparse hyperloglog data structure.
@ -805,7 +809,7 @@ updated:
return 1;
promote: /* Promote to dense representation. */
o->ptr = hllSparseToDense(o->ptr);
hllSparseToDense(o);
hdr = o->ptr;
return hllDenseAdd(hdr->registers, ele, elesize);
}