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app/vmselect: return NaN instead of 0 for empty value sets (#1660)
The change affects `count/stddev/stdvar_over_time` funcs and makes them to return NaN instead of zero when there is no datapoints in a time window. This is needed for improving compatibility with Prometheus. Signed-off-by: hagen1778 <roman@victoriametrics.com>
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@ -1352,10 +1352,7 @@ func rollupCount(rfa *rollupFuncArg) float64 {
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// before calling rollup funcs.
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values := rfa.values
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if len(values) == 0 {
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if math.IsNaN(rfa.prevValue) {
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return nan
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}
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return 0
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return nan
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}
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return float64(len(values))
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}
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@ -1372,10 +1369,7 @@ func rollupStdvar(rfa *rollupFuncArg) float64 {
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// before calling rollup funcs.
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values := rfa.values
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if len(values) == 0 {
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if math.IsNaN(rfa.prevValue) {
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return nan
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}
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return 0
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return nan
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}
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if len(values) == 1 {
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// Fast path.
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