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metricsql: fix label_join() when dst_label is equal to one of the `… (#5886)

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* metricsql: fix label_join() when `dst_label` is equal to one of the `src_label`

* Update app/vmselect/promql/transform.go

* Update docs/CHANGELOG.md

---------

Co-authored-by: Aliaksandr Valialkin <valyala@victoriametrics.com>
This commit is contained in:
Hui Wang 2024-02-29 22:00:22 +08:00 committed by Aliaksandr Valialkin
parent c432aba12f
commit 26d5054faf
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GPG key ID: 52C003EE2BCDB9EB
3 changed files with 17 additions and 2 deletions
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15
app/vmselect/promql/exec_test.go
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@ -2135,6 +2135,21 @@ func TestExecSuccess(t *testing.T) {
resultExpected := []netstorage.Result{r}
f(q, resultExpected)
})
t.Run(`label_join dst_label is equal to src_label`, func(t *testing.T) {
t.Parallel()
q := `label_join(label_join(time(), "bar", "sep1", "a", "b"), "bar", "sep2", "a", "bar")`
r := netstorage.Result{
MetricName: metricNameExpected,
Values: []float64{1000, 1200, 1400, 1600, 1800, 2000},
Timestamps: timestampsExpected,
}
r.MetricName.Tags = []storage.Tag{{
Key: []byte("bar"),
Value: []byte("sep2sep1"),
}}
resultExpected := []netstorage.Result{r}
f(q, resultExpected)
})
t.Run(`label_value()`, func(t *testing.T) {
t.Parallel()
q := `with (

3
app/vmselect/promql/transform.go
View file

@ -1923,8 +1923,7 @@ func transformLabelJoin(tfa *transformFuncArg) ([]*timeseries, error) {
for _, ts := range rvs {
mn := &ts.MetricName
dstValue := getDstValue(mn, dstLabel)
b := *dstValue
b = b[:0]
var b []byte
for j, srcLabel := range srcLabels {
srcValue := mn.GetTagValue(srcLabel)
b = append(b, srcValue...)

1
docs/CHANGELOG.md
View file

@ -17,6 +17,7 @@ The following `tip` changes can be tested by building VictoriaMetrics components
or [/api/v1/query_range](https://docs.victoriametrics.com/keyconcepts/#range-query). See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5795).
* BUGFIX: [Single-node VictoriaMetrics](https://docs.victoriametrics.com/) and `vmselect` in [VictoriaMetrics cluster](https://docs.victoriametrics.com/cluster-victoriametrics/): fixed floating-point error when parsing time in RFC3339 format. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5801) for details.
* BUGFIX: [vmalert](https://docs.victoriametrics.com/#vmalert): consistently sort groups by name and filename on `/groups` page in UI. This should prevent non-deterministic sorting for groups with identical names.
* BUGFIX: [MetricsQL](https://docs.victoriametrics.com/MetricsQL.html): properly construct the destination label in [label_join](https://docs.victoriametrics.com/metricsql/#label_join) if it is used as source label. See this [issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5881) for details.
## [v1.93.12](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.93.12)