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Fix ZUNIONSTORE/ZINTERSTORE to never store a NaN score.

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When +inf and -inf are added, the result is NaN. We don't want NaN
scores in a sorted set, so agreed on the result of this operation being
zero.
This commit is contained in:
Pieter Noordhuis
2010-07-29 21:31:58 +02:00
parent cbf7e1070a
commit d9e28bcf00
2 changed files with 28 additions and 0 deletions
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4
src/t_zset.c
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@ -541,6 +541,10 @@ int qsortCompareZsetopsrcByCardinality(const void *s1, const void *s2) {
inline static void zunionInterAggregate(double *target, double val, int aggregate) {
if (aggregate == REDIS_AGGR_SUM) {
*target = *target + val;
/* The result of adding two doubles is NaN when one variable
* is +inf and the other is -inf. When these numbers are added,
* we maintain the convention of the result being 0.0. */
if (isnan(*target)) *target = 0.0;
} else if (aggregate == REDIS_AGGR_MIN) {
*target = val < *target ? val : *target;
} else if (aggregate == REDIS_AGGR_MAX) {