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[PERF] PromQL: Replace Fprintf %f with AppendFloat

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The combination of `AvailableBuffer`` followed by `Write` is optimised
inside `bytes.Buffer`.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2025-08-22 10:58:01 +01:00
parent b8d2d505f5
commit 153cdb2b0b
1 changed files with 1 additions and 1 deletions
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2
promql/parser/printer.go
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@ -373,7 +373,7 @@ func (node *VectorSelector) String() string {
switch {
case node.Timestamp != nil:
b.WriteString(" @ ")
fmt.Fprintf(b, "%.3f", float64(*node.Timestamp)/1000.0)
b.Write(strconv.AppendFloat(b.AvailableBuffer(), float64(*node.Timestamp)/1000.0, 'f', 3, 64))
case node.StartOrEnd == START:
b.WriteString(" @ start()")
case node.StartOrEnd == END: