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Don't create a new iterator for every time step.

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Signed-off-by: Charles Korn <charles.korn@grafana.com>
This commit is contained in:
Charles Korn 2023-06-28 15:13:58 +10:00
parent b114c0888d
commit 993618adea
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1 changed files with 1 additions and 1 deletions
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2
promql/engine.go
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@ -1830,6 +1830,7 @@ func (ev *evaluator) evalTimestampFunctionOverVectorSelector(vs *parser.VectorSe
if err != nil {
ev.error(errWithWarnings{fmt.Errorf("expanding series: %w", err), ws})
}
it := storage.NewMemoizedEmptyIterator(durationMilliseconds(ev.lookbackDelta))
return ev.rangeEval(nil, func(v []parser.Value, _ [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
if vs.Timestamp != nil {
@ -1838,7 +1839,6 @@ func (ev *evaluator) evalTimestampFunctionOverVectorSelector(vs *parser.VectorSe
vs.Offset = time.Duration(enh.Ts-*vs.Timestamp) * time.Millisecond
}
vec := make(Vector, 0, len(vs.Series))
it := storage.NewMemoizedEmptyIterator(durationMilliseconds(ev.lookbackDelta))
var chkIter chunkenc.Iterator
for _, s := range vs.Series {
chkIter = s.Iterator(chkIter)