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#include <roaring/roaring.h>
#include <roaring/roaring_array.h>
#ifdef __cplusplus
using namespace ::roaring::internal;
extern "C" { namespace roaring { namespace api {
#endif
struct roaring_pq_element_s {
uint64_t size;
bool is_temporary;
roaring_bitmap_t *bitmap;
};
typedef struct roaring_pq_element_s roaring_pq_element_t;
struct roaring_pq_s {
roaring_pq_element_t *elements;
uint64_t size;
};
typedef struct roaring_pq_s roaring_pq_t;
static inline bool compare(roaring_pq_element_t *t1, roaring_pq_element_t *t2) {
return t1->size < t2->size;
}
static void pq_add(roaring_pq_t *pq, roaring_pq_element_t *t) {
uint64_t i = pq->size;
pq->elements[pq->size++] = *t;
while (i > 0) {
uint64_t p = (i - 1) >> 1;
roaring_pq_element_t ap = pq->elements[p];
if (!compare(t, &ap)) break;
pq->elements[i] = ap;
i = p;
}
pq->elements[i] = *t;
}
static void pq_free(roaring_pq_t *pq) {
roaring_free(pq);
}
static void percolate_down(roaring_pq_t *pq, uint32_t i) {
uint32_t size = (uint32_t)pq->size;
uint32_t hsize = size >> 1;
roaring_pq_element_t ai = pq->elements[i];
while (i < hsize) {
uint32_t l = (i << 1) + 1;
uint32_t r = l + 1;
roaring_pq_element_t bestc = pq->elements[l];
if (r < size) {
if (compare(pq->elements + r, &bestc)) {
l = r;
bestc = pq->elements[r];
}
}
if (!compare(&bestc, &ai)) {
break;
}
pq->elements[i] = bestc;
i = l;
}
pq->elements[i] = ai;
}
static roaring_pq_t *create_pq(const roaring_bitmap_t **arr, uint32_t length) {
size_t alloc_size = sizeof(roaring_pq_t) + sizeof(roaring_pq_element_t) * length;
roaring_pq_t *answer = (roaring_pq_t *)roaring_malloc(alloc_size);
answer->elements = (roaring_pq_element_t *)(answer + 1);
answer->size = length;
for (uint32_t i = 0; i < length; i++) {
answer->elements[i].bitmap = (roaring_bitmap_t *)arr[i];
answer->elements[i].is_temporary = false;
answer->elements[i].size =
roaring_bitmap_portable_size_in_bytes(arr[i]);
}
for (int32_t i = (length >> 1); i >= 0; i--) {
percolate_down(answer, i);
}
return answer;
}
static roaring_pq_element_t pq_poll(roaring_pq_t *pq) {
roaring_pq_element_t ans = *pq->elements;
if (pq->size > 1) {
pq->elements[0] = pq->elements[--pq->size];
percolate_down(pq, 0);
} else
--pq->size;
// memmove(pq->elements,pq->elements+1,(pq->size-1)*sizeof(roaring_pq_element_t));--pq->size;
return ans;
}
// this function consumes and frees the inputs
static roaring_bitmap_t *lazy_or_from_lazy_inputs(roaring_bitmap_t *x1,
roaring_bitmap_t *x2) {
uint8_t result_type = 0;
const int length1 = ra_get_size(&x1->high_low_container),
length2 = ra_get_size(&x2->high_low_container);
if (0 == length1) {
roaring_bitmap_free(x1);
return x2;
}
if (0 == length2) {
roaring_bitmap_free(x2);
return x1;
}
uint32_t neededcap = length1 > length2 ? length2 : length1;
roaring_bitmap_t *answer = roaring_bitmap_create_with_capacity(neededcap);
int pos1 = 0, pos2 = 0;
uint8_t type1, type2;
uint16_t s1 = ra_get_key_at_index(&x1->high_low_container, pos1);
uint16_t s2 = ra_get_key_at_index(&x2->high_low_container, pos2);
while (true) {
if (s1 == s2) {
// todo: unsharing can be inefficient as it may create a clone where
// none
// is needed, but it has the benefit of being easy to reason about.
ra_unshare_container_at_index(&x1->high_low_container, pos1);
container_t *c1 = ra_get_container_at_index(
&x1->high_low_container, pos1, &type1);
assert(type1 != SHARED_CONTAINER_TYPE);
ra_unshare_container_at_index(&x2->high_low_container, pos2);
container_t *c2 = ra_get_container_at_index(
&x2->high_low_container, pos2, &type2);
assert(type2 != SHARED_CONTAINER_TYPE);
container_t *c;
if ((type2 == BITSET_CONTAINER_TYPE) &&
(type1 != BITSET_CONTAINER_TYPE)
){
c = container_lazy_ior(c2, type2, c1, type1, &result_type);
container_free(c1, type1);
if (c != c2) {
container_free(c2, type2);
}
} else {
c = container_lazy_ior(c1, type1, c2, type2, &result_type);
container_free(c2, type2);
if (c != c1) {
container_free(c1, type1);
}
}
// since we assume that the initial containers are non-empty, the
// result here
// can only be non-empty
ra_append(&answer->high_low_container, s1, c, result_type);
++pos1;
++pos2;
if (pos1 == length1) break;
if (pos2 == length2) break;
s1 = ra_get_key_at_index(&x1->high_low_container, pos1);
s2 = ra_get_key_at_index(&x2->high_low_container, pos2);
} else if (s1 < s2) { // s1 < s2
container_t *c1 = ra_get_container_at_index(
&x1->high_low_container, pos1, &type1);
ra_append(&answer->high_low_container, s1, c1, type1);
pos1++;
if (pos1 == length1) break;
s1 = ra_get_key_at_index(&x1->high_low_container, pos1);
} else { // s1 > s2
container_t *c2 = ra_get_container_at_index(
&x2->high_low_container, pos2, &type2);
ra_append(&answer->high_low_container, s2, c2, type2);
pos2++;
if (pos2 == length2) break;
s2 = ra_get_key_at_index(&x2->high_low_container, pos2);
}
}
if (pos1 == length1) {
ra_append_move_range(&answer->high_low_container,
&x2->high_low_container, pos2, length2);
} else if (pos2 == length2) {
ra_append_move_range(&answer->high_low_container,
&x1->high_low_container, pos1, length1);
}
ra_clear_without_containers(&x1->high_low_container);
ra_clear_without_containers(&x2->high_low_container);
roaring_free(x1);
roaring_free(x2);
return answer;
}
/**
* Compute the union of 'number' bitmaps using a heap. This can
* sometimes be faster than roaring_bitmap_or_many which uses
* a naive algorithm. Caller is responsible for freeing the
* result.
*/
roaring_bitmap_t *roaring_bitmap_or_many_heap(uint32_t number,
const roaring_bitmap_t **x) {
if (number == 0) {
return roaring_bitmap_create();
}
if (number == 1) {
return roaring_bitmap_copy(x[0]);
}
roaring_pq_t *pq = create_pq(x, number);
while (pq->size > 1) {
roaring_pq_element_t x1 = pq_poll(pq);
roaring_pq_element_t x2 = pq_poll(pq);
if (x1.is_temporary && x2.is_temporary) {
roaring_bitmap_t *newb =
lazy_or_from_lazy_inputs(x1.bitmap, x2.bitmap);
// should normally return a fresh new bitmap *except* that
// it can return x1.bitmap or x2.bitmap in degenerate cases
bool temporary = !((newb == x1.bitmap) && (newb == x2.bitmap));
uint64_t bsize = roaring_bitmap_portable_size_in_bytes(newb);
roaring_pq_element_t newelement = {
.size = bsize, .is_temporary = temporary, .bitmap = newb};
pq_add(pq, &newelement);
} else if (x2.is_temporary) {
roaring_bitmap_lazy_or_inplace(x2.bitmap, x1.bitmap, false);
x2.size = roaring_bitmap_portable_size_in_bytes(x2.bitmap);
pq_add(pq, &x2);
} else if (x1.is_temporary) {
roaring_bitmap_lazy_or_inplace(x1.bitmap, x2.bitmap, false);
x1.size = roaring_bitmap_portable_size_in_bytes(x1.bitmap);
pq_add(pq, &x1);
} else {
roaring_bitmap_t *newb =
roaring_bitmap_lazy_or(x1.bitmap, x2.bitmap, false);
uint64_t bsize = roaring_bitmap_portable_size_in_bytes(newb);
roaring_pq_element_t newelement = {
.size = bsize, .is_temporary = true, .bitmap = newb};
pq_add(pq, &newelement);
}
}
roaring_pq_element_t X = pq_poll(pq);
roaring_bitmap_t *answer = X.bitmap;
roaring_bitmap_repair_after_lazy(answer);
pq_free(pq);
return answer;
}
#ifdef __cplusplus
} } } // extern "C" { namespace roaring { namespace api {
#endif
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