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Expand series set just once

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Signed-off-by: Charles Korn <charles.korn@grafana.com>
This commit is contained in:
Charles Korn 2023-06-28 15:11:01 +10:00
parent 17b1486964
commit 90ac889e1f
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1 changed files with 5 additions and 4 deletions
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9
promql/engine.go
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@ -1792,16 +1792,17 @@ func (ev *evaluator) eval(expr parser.Expr) (parser.Value, storage.Warnings) {
}
func (ev *evaluator) evalTimestampFunctionOverVectorSelector(vs *parser.VectorSelector, call FunctionCall, e *parser.Call) (parser.Value, storage.Warnings) {
ws, err := checkAndExpandSeriesSet(ev.ctx, vs)
if err != nil {
ev.error(errWithWarnings{fmt.Errorf("expanding series: %w", err), ws})
}
return ev.rangeEval(nil, func(v []parser.Value, _ [][]EvalSeriesHelper, enh *EvalNodeHelper) (Vector, storage.Warnings) {
if vs.Timestamp != nil {
// This is a special case only for "timestamp" since the offset
// needs to be adjusted for every point.
vs.Offset = time.Duration(enh.Ts-*vs.Timestamp) * time.Millisecond
}
ws, err := checkAndExpandSeriesSet(ev.ctx, vs)
if err != nil {
ev.error(errWithWarnings{fmt.Errorf("expanding series: %w", err), ws})
}
vec := make(Vector, 0, len(vs.Series))
it := storage.NewMemoizedEmptyIterator(durationMilliseconds(ev.lookbackDelta))
var chkIter chunkenc.Iterator