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app/vmselect/promql: do not return 0 value from sum_over_time(m[d]) when there are no samples on the given d window.

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This aligns the behaviour of `sum_over_time()` with other `_over_time()` functions and with Prometheus behavior.
This commit is contained in:
Aliaksandr Valialkin 2020-12-02 13:11:32 +02:00
parent 490c70a958
commit def513355e
1 changed files with 4 additions and 4 deletions
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8
app/vmselect/promql/rollup.go
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@ -1142,10 +1142,10 @@ func rollupSum(rfa *rollupFuncArg) float64 {
// before calling rollup funcs.
values := rfa.values
if len(values) == 0 {
if math.IsNaN(rfa.prevValue) {
return nan
}
return 0
// Do not take into account rfa.prevValue, since it may lead
// to inconsistent results comparing to Prometheus on broken time series
// with irregular data points.
return nan
}
var sum float64
for _, v := range values {