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Avoid divide-by-zero in CardinalityCounter::Size

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This commit is contained in:
Tim Wojtulewicz 2025-04-04 15:42:41 -07:00
parent bde2dec685
commit bf82f8afc1
2 changed files with 6 additions and 1 deletions
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4
src/probabilistic/CardinalityCounter.cc
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@ -134,6 +134,10 @@ void CardinalityCounter::AddElement(uint64_t hash) {
**/ **/
double CardinalityCounter::Size() const { double CardinalityCounter::Size() const {
double answer = 0; double answer = 0;
if ( m == 0 )
return -1.0;
for ( unsigned int i = 0; i < m; i++ ) for ( unsigned int i = 0; i < m; i++ )
answer += pow(2, -((int)buckets[i])); answer += pow(2, -((int)buckets[i]));

3
src/probabilistic/CardinalityCounter.h
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@ -75,7 +75,8 @@ public:
* Get the current estimated number of elements in the data * Get the current estimated number of elements in the data
* structure * structure
* *
* @return Estimated number of elements * @return Estimated number of elements. Returns -1.0 if there are
* zero buckets.
**/ **/
double Size() const; double Size() const;