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Fix decoding buckets for native histograms in binops

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The optimizer which detects cases where histogram buckets can be skipped
does not take into account binary expressions. This can lead to buckets
not being decoded if a metric is used with both histogram_fraction/quantile and
histogram_sum/count in the same expression.

Signed-off-by: Filip Petkovski <filip.petkovsky@gmail.com>
This commit is contained in:
Filip Petkovski 2024-07-10 11:55:26 +02:00
parent d002fad00c
commit acb6c1ae4b
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2 changed files with 9 additions and 0 deletions
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6
promql/engine.go
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@ -3450,6 +3450,12 @@ func setOffsetForAtModifier(evalTime int64, expr parser.Expr) {
// required for correctness.
func detectHistogramStatsDecoding(expr parser.Expr) {
parser.Inspect(expr, func(node parser.Node, path []parser.Node) error {
if n, ok := node.(*parser.BinaryExpr); ok {
detectHistogramStatsDecoding(n.LHS)
detectHistogramStatsDecoding(n.RHS)
return fmt.Errorf("stop")
}
n, ok := (node).(*parser.VectorSelector)
if !ok {
return nil

3
promql/promqltest/testdata/native_histograms.test vendored
View file

@ -715,6 +715,9 @@ eval instant at 10m histogram_fraction(NaN, NaN, histogram_fraction_4)
eval instant at 10m histogram_fraction(-Inf, +Inf, histogram_fraction_4)
{} 1
eval instant at 10m histogram_sum(scalar(histogram_fraction(-Inf, +Inf, sum(histogram_fraction_4))) * histogram_fraction_4)
{} 100
clear
# Counter reset only noticeable in a single bucket.