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Export promql.Engine.FindMinMaxTime

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This function is useful to analyze promQL queries. We want to use this in Mimir to record the time range which the query touches.

I also chose to remove the `Engine` receiver because it was unnecessary, and it makes it easier to use, but happy to refactor that if you disagree.

The function is untested on its own. If you prefer to have unit tests now that its exported, I can look into adding some.

Signed-off-by: Dimitar Dimitrov <dimitar.dimitrov@grafana.com>
This commit is contained in:
Dimitar Dimitrov 2023-11-02 13:17:35 +01:00
parent 7eaefcf379
commit 9e3df532d8
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GPG key ID: 4541B04E6C90EBC3
1 changed files with 8 additions and 5 deletions
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13
promql/engine.go
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@ -674,7 +674,7 @@ func durationMilliseconds(d time.Duration) int64 {
// execEvalStmt evaluates the expression of an evaluation statement for the given time range.
func (ng *Engine) execEvalStmt(ctx context.Context, query *query, s *parser.EvalStmt) (parser.Value, annotations.Annotations, error) {
prepareSpanTimer, ctxPrepare := query.stats.GetSpanTimer(ctx, stats.QueryPreparationTime, ng.metrics.queryPrepareTime)
mint, maxt := ng.findMinMaxTime(s)
mint, maxt := FindMinMaxTime(s)
querier, err := query.queryable.Querier(mint, maxt)
if err != nil {
prepareSpanTimer.Finish()
@ -816,7 +816,10 @@ func subqueryTimes(path []parser.Node) (time.Duration, time.Duration, *int64) {
return subqOffset, subqRange, tsp
}
func (ng *Engine) findMinMaxTime(s *parser.EvalStmt) (int64, int64) {
// FindMinMaxTime returns the time in milliseconds of the earliest and latest point in time the statement will try to process.
// This takes into account offsets, @ modifiers, and range selectors.
// If the statement does not select series, then FindMinMaxTime returns (0, 0).
func FindMinMaxTime(s *parser.EvalStmt) (int64, int64) {
var minTimestamp, maxTimestamp int64 = math.MaxInt64, math.MinInt64
// Whenever a MatrixSelector is evaluated, evalRange is set to the corresponding range.
// The evaluation of the VectorSelector inside then evaluates the given range and unsets
@ -825,7 +828,7 @@ func (ng *Engine) findMinMaxTime(s *parser.EvalStmt) (int64, int64) {
parser.Inspect(s.Expr, func(node parser.Node, path []parser.Node) error {
switch n := node.(type) {
case *parser.VectorSelector:
start, end := ng.getTimeRangesForSelector(s, n, path, evalRange)
start, end := getTimeRangesForSelector(s, n, path, evalRange)
if start < minTimestamp {
minTimestamp = start
}
@ -848,7 +851,7 @@ func (ng *Engine) findMinMaxTime(s *parser.EvalStmt) (int64, int64) {
return minTimestamp, maxTimestamp
}
func (ng *Engine) getTimeRangesForSelector(s *parser.EvalStmt, n *parser.VectorSelector, path []parser.Node, evalRange time.Duration) (int64, int64) {
func getTimeRangesForSelector(s *parser.EvalStmt, n *parser.VectorSelector, path []parser.Node, evalRange time.Duration) (int64, int64) {
start, end := timestamp.FromTime(s.Start), timestamp.FromTime(s.End)
subqOffset, subqRange, subqTs := subqueryTimes(path)
@ -905,7 +908,7 @@ func (ng *Engine) populateSeries(ctx context.Context, querier storage.Querier, s
parser.Inspect(s.Expr, func(node parser.Node, path []parser.Node) error {
switch n := node.(type) {
case *parser.VectorSelector:
start, end := ng.getTimeRangesForSelector(s, n, path, evalRange)
start, end := getTimeRangesForSelector(s, n, path, evalRange)
interval := ng.getLastSubqueryInterval(path)
if interval == 0 {
interval = s.Interval