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[PERF] PromQL: Don't wrap matrix selectors as time-invariant

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Matrix selectors have a Timestamp which indicates they are time-invariant,
so we don't need to wrap and then unwrap them when we come to use them.

Fix up tests that check this level of detail.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2025-07-19 16:11:00 +01:00
parent b290e0ec17
commit 94d3cac4ea
2 changed files with 54 additions and 47 deletions
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7
promql/engine.go
View File

@ -1781,8 +1781,7 @@ func (ev *evaluator) eval(ctx context.Context, expr parser.Expr) (parser.Value,
}
unwrapParenExpr(&e.Args[matrixArgIndex])
arg := unwrapStepInvariantExpr(e.Args[matrixArgIndex])
unwrapParenExpr(&arg)
arg := e.Args[matrixArgIndex]
sel := arg.(*parser.MatrixSelector)
selVS := sel.VectorSelector.(*parser.VectorSelector)
@ -3794,7 +3793,9 @@ func preprocessExprHelper(expr parser.Expr, start, end time.Time) (isStepInvaria
return false, false
case *parser.MatrixSelector:
return preprocessExprHelper(n.VectorSelector, start, end)
// We don't need to wrap a MatrixSelector because functions over range vectors evaluate those directly.
isStepInvariant, _ := preprocessExprHelper(n.VectorSelector, start, end)
return isStepInvariant, false
case *parser.SubqueryExpr:
// Since we adjust offset for the @ modifier evaluation,

28
promql/engine_test.go
View File

@ -2423,8 +2423,7 @@ func TestPreprocessAndWrapWithStepInvariantExpr(t *testing.T) {
},
{
input: `test{a="b"}[5y] @ 1603774699`,
expected: &parser.StepInvariantExpr{
Expr: &parser.MatrixSelector{
expected: &parser.MatrixSelector{
VectorSelector: &parser.VectorSelector{
Name: "test",
Timestamp: makeInt64Pointer(1603774699000),
@ -2441,7 +2440,6 @@ func TestPreprocessAndWrapWithStepInvariantExpr(t *testing.T) {
EndPos: 28,
},
},
},
{
input: "sum by (foo)(some_metric)",
expected: &parser.AggregateExpr{
@ -2938,9 +2936,16 @@ func TestPreprocessAndWrapWithStepInvariantExpr(t *testing.T) {
},
},
{
input: `test[5y] @ start()`,
input: `sum_over_time(test[5y] @ start())`,
expected: &parser.StepInvariantExpr{
Expr: &parser.MatrixSelector{
Expr: &parser.Call{
Func: &parser.Function{
Name: "sum_over_time",
ArgTypes: []parser.ValueType{parser.ValueTypeMatrix},
ReturnType: parser.ValueTypeVector,
},
Args: parser.Expressions{
&parser.MatrixSelector{
VectorSelector: &parser.VectorSelector{
Name: "test",
Timestamp: makeInt64Pointer(timestamp.FromTime(startTime)),
@ -2949,19 +2954,21 @@ func TestPreprocessAndWrapWithStepInvariantExpr(t *testing.T) {
parser.MustLabelMatcher(labels.MatchEqual, "__name__", "test"),
},
PosRange: posrange.PositionRange{
Start: 0,
End: 4,
Start: 14,
End: 18,
},
},
Range: 5 * 365 * 24 * time.Hour,
EndPos: 18,
EndPos: 32,
},
},
PosRange: posrange.PositionRange{Start: 0, End: 33},
},
},
},
{
input: `test[5y] @ end()`,
expected: &parser.StepInvariantExpr{
Expr: &parser.MatrixSelector{
expected: &parser.MatrixSelector{
VectorSelector: &parser.VectorSelector{
Name: "test",
Timestamp: makeInt64Pointer(timestamp.FromTime(endTime)),
@ -2978,7 +2985,6 @@ func TestPreprocessAndWrapWithStepInvariantExpr(t *testing.T) {
EndPos: 16,
},
},
},
{
input: `some_metric[10m:5s] @ start()`,
expected: &parser.StepInvariantExpr{