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promql: Preallocate slice in extendFloats

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Signed-off-by: Rushabh Mehta <mehtarushabh2005@gmail.com>
This commit is contained in:
Rushabh Mehta 2025-12-26 23:54:17 +05:30
parent 48e6f6a751
commit fc330642e4
1 changed files with 3 additions and 3 deletions
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6
promql/engine.go
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@ -4418,9 +4418,9 @@ func extendFloats(floats []FPoint, mint, maxt int64, smoothed bool) []FPoint {
lastSampleIndex--
}
// TODO: Preallocate the length of the new list.
out := make([]FPoint, 0)
// Create the new floats list with the boundary samples and the inner samples.
count := max(lastSampleIndex-firstSampleIndex+1, 0)
out := make([]FPoint, 0, count+2)
out = append(out, FPoint{T: mint, F: left})
out = append(out, floats[firstSampleIndex:lastSampleIndex+1]...)
out = append(out, FPoint{T: maxt, F: right})