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explain_test.go
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explain_test.go
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package logql
import (
"context"
"testing"
"time"
"github.com/go-kit/log"
"github.com/stretchr/testify/require"
"github.com/grafana/dskit/user"
"github.com/grafana/loki/v3/pkg/logql/syntax"
)
func TestExplain(t *testing.T) {
query := `topk(5, avg_over_time({app="loki"} |= "caller=metrics.go" | logfmt | unwrap bytes [5s]))`
// TODO(karsten): Ideally the querier and downstreamer are not required
// to create the step evaluators.
querier := NewMockQuerier(4, nil)
opts := EngineOpts{}
regular := NewEngine(opts, querier, NoLimits, log.NewNopLogger())
ctx := user.InjectOrgID(context.Background(), "fake")
defaultEv := NewDefaultEvaluator(querier, 30*time.Second)
downEv := &DownstreamEvaluator{Downstreamer: MockDownstreamer{regular}, defaultEvaluator: defaultEv}
strategy := NewPowerOfTwoStrategy(ConstantShards(4))
mapper := NewShardMapper(strategy, nilShardMetrics, []string{ShardQuantileOverTime})
_, _, expr, err := mapper.Parse(syntax.MustParseExpr(query))
require.NoError(t, err)
params := LiteralParams{
queryString: query,
start: time.Unix(60, 0),
end: time.Unix(60, 0),
limit: 1000,
}
ev, err := downEv.NewStepEvaluator(ctx, downEv, expr.(syntax.SampleExpr), params)
require.NoError(t, err)
tree := NewTree()
ev.Explain(tree)
expected :=
`[topk, by ()] VectorAgg
└── Concat
├── VectorStep
├── ...
└── VectorStep
`
require.Equal(t, expected, tree.String())
}