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Reuse buffer for hash computation in the engine. #2218

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Jun 19, 2020
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Reuse buffer for hash computation in the engine. #2218

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8 changes: 5 additions & 3 deletions pkg/logql/evaluator.go
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Original file line number Diff line number Diff line change
Expand Up @@ -188,6 +188,8 @@ func vectorAggEvaluator(
if err != nil {
return nil, err
}
lb := labels.NewBuilder(nil)
buf := make([]byte, 0, 1024)

return newStepEvaluator(func() (bool, int64, promql.Vector) {
next, ts, vec := nextEvaluator.Next()
Expand All @@ -209,17 +211,17 @@ func vectorAggEvaluator(
groupingKey uint64
)
if expr.grouping.without {
groupingKey, _ = metric.HashWithoutLabels(make([]byte, 0, 1024), expr.grouping.groups...)
groupingKey, buf = metric.HashWithoutLabels(buf, expr.grouping.groups...)
} else {
groupingKey, _ = metric.HashForLabels(make([]byte, 0, 1024), expr.grouping.groups...)
groupingKey, buf = metric.HashForLabels(buf, expr.grouping.groups...)
}
group, ok := result[groupingKey]
// Add a new group if it doesn't exist.
if !ok {
var m labels.Labels

if expr.grouping.without {
lb := labels.NewBuilder(metric)
lb.Reset(metric)
lb.Del(expr.grouping.groups...)
lb.Del(labels.MetricName)
m = lb.Labels()
Expand Down