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app/vmselect: always return zero for stddev func if there is only one value (#1659)

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The fix will always return zero if received set of items consists of one
element only, which also means no deviation.

Signed-off-by: hagen1778 <roman@victoriametrics.com>
This commit is contained in:
Roman Khavronenko 2021-09-29 00:38:55 +03:00 committed by Aliaksandr Valialkin
parent 72468c9d75
commit f46f847531
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1 changed files with 1 additions and 1 deletions
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2
app/vmselect/promql/rollup.go
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@ -1373,7 +1373,7 @@ func rollupStdvar(rfa *rollupFuncArg) float64 {
}
if len(values) == 1 {
// Fast path.
return values[0]
return 0
}
var avg float64
var count float64