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Avoid extra copying of label values

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Patrick Oyarzun 2023-04-18 15:50:05 -05:00
parent cc9072ad64
commit e52ce3e361
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1 changed files with 7 additions and 5 deletions
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12
tsdb/querier.go
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@ -347,13 +347,15 @@ func labelValuesWithMatchers(r IndexReader, name string, matchers ...*labels.Mat
continue
}
for i := len(allValues) - 1; i >= 0; i-- {
if m.Matches(allValues[i]) {
continue
// re-use the allValues slice to avoid allocations
// this is safe because the iteration is always ahead of the append
filteredValues := allValues[:0]
for _, v := range allValues {
if m.Matches(v) {
filteredValues = append(filteredValues, v)
}
allValues = append(allValues[:i], allValues[i+1:]...)
}
allValues = filteredValues
}
valuesPostings := make([]index.Postings, len(allValues))