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promql: extract function to initialize LabelBuilder

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Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2022-12-23 12:40:22 +00:00
parent ccea61c7bf
commit 2c382f5e24
1 changed files with 9 additions and 6 deletions
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15
promql/engine.go
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@ -1032,6 +1032,14 @@ type EvalNodeHelper struct {
resultMetric map[string]labels.Labels
}
func (enh *EvalNodeHelper) resetBuilder(lbls labels.Labels) {
if enh.lb == nil {
enh.lb = labels.NewBuilder(lbls)
} else {
enh.lb.Reset(lbls)
}
}
// DropMetricName is a cached version of DropMetricName.
func (enh *EvalNodeHelper) DropMetricName(l labels.Labels) labels.Labels {
if enh.Dmn == nil {
@ -2152,12 +2160,7 @@ func resultMetric(lhs, rhs labels.Labels, op parser.ItemType, matching *parser.V
enh.resultMetric = make(map[string]labels.Labels, len(enh.Out))
}
if enh.lb == nil {
enh.lb = labels.NewBuilder(lhs)
} else {
enh.lb.Reset(lhs)
}
enh.resetBuilder(lhs)
buf := bytes.NewBuffer(enh.lblResultBuf[:0])
enh.lblBuf = lhs.Bytes(enh.lblBuf)
buf.Write(enh.lblBuf)