Merge pull request #536 from prometheus/offset

Implement offset operator.
2025-01-26 13:11:11 -08:00 · 2015-02-18 14:48:56 +01:00 · 2015-02-18 14:48:56 +01:00 · c069c0dafa
parent 40b0a1ac0d 15b2b5aa66
commit c069c0dafa
9 changed files with 990 additions and 945 deletions
--- a/rules/ast/ast.go
+++ b/rules/ast/ast.go
@ -215,6 +215,7 @@ type (
 	// A VectorSelector represents a metric name plus labelset.
 	VectorSelector struct {
 		labelMatchers metric.LabelMatchers
+		offset        time.Duration
 		// The series iterators are populated at query analysis time.
 		iterators map[clientmodel.Fingerprint]local.SeriesIterator
 		metrics   map[clientmodel.Fingerprint]clientmodel.COWMetric
@ -261,6 +262,7 @@ type (
 		// Fingerprints are populated from label matchers at query analysis time.
 		fingerprints clientmodel.Fingerprints
 		interval     time.Duration
+		offset       time.Duration
 	}
 )

@ -561,8 +563,8 @@ func (node *VectorSelector) Eval(timestamp clientmodel.Timestamp) Vector {
 	//// timer := v.stats.GetTimer(stats.GetValueAtTimeTime).Start()
 	samples := Vector{}
 	for fp, it := range node.iterators {
-		sampleCandidates := it.GetValueAtTime(timestamp)
-		samplePair := chooseClosestSample(sampleCandidates, timestamp)
+		sampleCandidates := it.GetValueAtTime(timestamp.Add(-node.offset))
+		samplePair := chooseClosestSample(sampleCandidates, timestamp.Add(-node.offset))
 		if samplePair != nil {
 			samples = append(samples, &Sample{
 				Metric:    node.metrics[fp],
@ -823,8 +825,8 @@ func (node *VectorArithExpr) Eval(timestamp clientmodel.Timestamp) Vector {
 // the selector.
 func (node *MatrixSelector) Eval(timestamp clientmodel.Timestamp) Matrix {
 	interval := &metric.Interval{
-		OldestInclusive: timestamp.Add(-node.interval),
-		NewestInclusive: timestamp,
+		OldestInclusive: timestamp.Add(-node.interval - node.offset),
+		NewestInclusive: timestamp.Add(-node.offset),
 	}

 	//// timer := v.stats.GetTimer(stats.GetRangeValuesTime).Start()
@ -835,6 +837,12 @@ func (node *MatrixSelector) Eval(timestamp clientmodel.Timestamp) Matrix {
 			continue
 		}

+		if node.offset != 0 {
+			for _, sp := range samplePairs {
+				sp.Timestamp = sp.Timestamp.Add(node.offset)
+			}
+		}
+
 		sampleStream := SampleStream{
 			Metric: node.metrics[fp],
 			Values: samplePairs,
@ -910,9 +918,10 @@ func NewScalarLiteral(value clientmodel.SampleValue) *ScalarLiteral {

 // NewVectorSelector returns a (not yet evaluated) VectorSelector with
 // the given LabelSet.
-func NewVectorSelector(m metric.LabelMatchers) *VectorSelector {
+func NewVectorSelector(m metric.LabelMatchers, offset time.Duration) *VectorSelector {
 	return &VectorSelector{
 		labelMatchers: m,
+		offset:        offset,
 		iterators:     map[clientmodel.Fingerprint]local.SeriesIterator{},
 		metrics:       map[clientmodel.Fingerprint]clientmodel.COWMetric{},
 	}
@ -1002,10 +1011,11 @@ func NewArithExpr(opType BinOpType, lhs Node, rhs Node) (Node, error) {

 // NewMatrixSelector returns a (not yet evaluated) MatrixSelector with
 // the given VectorSelector and Duration.
-func NewMatrixSelector(vector *VectorSelector, interval time.Duration) *MatrixSelector {
+func NewMatrixSelector(vector *VectorSelector, interval time.Duration, offset time.Duration) *MatrixSelector {
 	return &MatrixSelector{
 		labelMatchers: vector.labelMatchers,
 		interval:      interval,
+		offset:        offset,
 		iterators:     map[clientmodel.Fingerprint]local.SeriesIterator{},
 		metrics:       map[clientmodel.Fingerprint]clientmodel.COWMetric{},
 	}
--- a/rules/ast/query_analyzer.go
+++ b/rules/ast/query_analyzer.go
@ -22,69 +22,80 @@ import (
 	"github.com/prometheus/prometheus/storage/local"
 )

-// FullRangeMap maps the fingerprint of a full range to the duration
-// of the matrix selector it resulted from.
-type FullRangeMap map[clientmodel.Fingerprint]time.Duration
+// preloadTimes tracks which instants or ranges to preload for a set of
+// fingerprints. One of these structs is collected for each offset by the query
+// analyzer.
+type preloadTimes struct {
+	// Instants require single samples to be loaded along the entire query
+	// range, with intervals between the samples corresponding to the query
+	// resolution.
+	instants map[clientmodel.Fingerprint]struct{}
+	// Ranges require loading a range of samples at each resolution step,
+	// stretching backwards from the current evaluation timestamp. The length of
+	// the range into the past is given by the duration, as in "foo[5m]".
+	ranges map[clientmodel.Fingerprint]time.Duration
+}

-// IntervalRangeMap is a set of fingerprints of interval ranges.
-type IntervalRangeMap map[clientmodel.Fingerprint]bool
-
-// A QueryAnalyzer recursively traverses the AST to look for any nodes
+// A queryAnalyzer recursively traverses the AST to look for any nodes
 // which will need data from the datastore. Instantiate with
-// NewQueryAnalyzer.
-type QueryAnalyzer struct {
-	// Values collected by query analysis.
-	//
-	// Full ranges always implicitly span a time range of:
-	// - start: query interval start - duration
-	// - end:   query interval end
-	//
-	// This is because full ranges can only result from matrix selectors (like
-	// "foo[5m]"), which have said time-spanning behavior during a ranged query.
-	FullRanges FullRangeMap
-	// Interval ranges always implicitly span the whole query range.
-	IntervalRanges IntervalRangeMap
+// newQueryAnalyzer.
+type queryAnalyzer struct {
+	// Tracks one set of times to preload per offset that occurs in the query
+	// expression.
+	offsetPreloadTimes map[time.Duration]preloadTimes
 	// The underlying storage to which the query will be applied. Needed for
 	// extracting timeseries fingerprint information during query analysis.
 	storage local.Storage
 }

-// NewQueryAnalyzer returns a pointer to a newly instantiated
-// QueryAnalyzer. The storage is needed to extract timeseries
+// newQueryAnalyzer returns a pointer to a newly instantiated
+// queryAnalyzer. The storage is needed to extract timeseries
 // fingerprint information during query analysis.
-func NewQueryAnalyzer(storage local.Storage) *QueryAnalyzer {
-	return &QueryAnalyzer{
-		FullRanges:     FullRangeMap{},
-		IntervalRanges: IntervalRangeMap{},
-		storage:        storage,
+func newQueryAnalyzer(storage local.Storage) *queryAnalyzer {
+	return &queryAnalyzer{
+		offsetPreloadTimes: map[time.Duration]preloadTimes{},
+		storage:            storage,
 	}
 }

-// Visit implements the Visitor interface.
-func (analyzer *QueryAnalyzer) Visit(node Node) {
+func (analyzer *queryAnalyzer) getPreloadTimes(offset time.Duration) preloadTimes {
+	if _, ok := analyzer.offsetPreloadTimes[offset]; !ok {
+		analyzer.offsetPreloadTimes[offset] = preloadTimes{
+			instants: map[clientmodel.Fingerprint]struct{}{},
+			ranges:   map[clientmodel.Fingerprint]time.Duration{},
+		}
+	}
+	return analyzer.offsetPreloadTimes[offset]
+}
+
+// visit implements the visitor interface.
+func (analyzer *queryAnalyzer) visit(node Node) {
 	switch n := node.(type) {
 	case *VectorSelector:
+		pt := analyzer.getPreloadTimes(n.offset)
 		fingerprints := analyzer.storage.GetFingerprintsForLabelMatchers(n.labelMatchers)
 		n.fingerprints = fingerprints
 		for _, fp := range fingerprints {
-			// Only add the fingerprint to IntervalRanges if not yet present in FullRanges.
-			// Full ranges always contain more points and span more time than interval ranges.
-			if _, alreadyInFullRanges := analyzer.FullRanges[fp]; !alreadyInFullRanges {
-				analyzer.IntervalRanges[fp] = true
+			// Only add the fingerprint to the instants if not yet present in the
+			// ranges. Ranges always contain more points and span more time than
+			// instants for the same offset.
+			if _, alreadyInRanges := pt.ranges[fp]; !alreadyInRanges {
+				pt.instants[fp] = struct{}{}
 			}

 			n.metrics[fp] = analyzer.storage.GetMetricForFingerprint(fp)
 		}
 	case *MatrixSelector:
+		pt := analyzer.getPreloadTimes(n.offset)
 		fingerprints := analyzer.storage.GetFingerprintsForLabelMatchers(n.labelMatchers)
 		n.fingerprints = fingerprints
 		for _, fp := range fingerprints {
-			if analyzer.FullRanges[fp] < n.interval {
-				analyzer.FullRanges[fp] = n.interval
-				// Delete the fingerprint from IntervalRanges. Full ranges always contain
-				// more points and span more time than interval ranges, so we don't need
-				// an interval range for the same fingerprint, should we have one.
-				delete(analyzer.IntervalRanges, fp)
+			if pt.ranges[fp] < n.interval {
+				pt.ranges[fp] = n.interval
+				// Delete the fingerprint from the instants. Ranges always contain more
+				// points and span more time than instants, so we don't need to track
+				// an instant for the same fingerprint, should we have one.
+				delete(pt.instants, fp)
 			}

 			n.metrics[fp] = analyzer.storage.GetMetricForFingerprint(fp)
@ -96,7 +107,7 @@ type iteratorInitializer struct {
 	storage local.Storage
 }

-func (i *iteratorInitializer) Visit(node Node) {
+func (i *iteratorInitializer) visit(node Node) {
 	switch n := node.(type) {
 	case *VectorSelector:
 		for _, fp := range n.fingerprints {
@ -113,34 +124,37 @@ func prepareInstantQuery(node Node, timestamp clientmodel.Timestamp, storage loc
 	totalTimer := queryStats.GetTimer(stats.TotalEvalTime)

 	analyzeTimer := queryStats.GetTimer(stats.QueryAnalysisTime).Start()
-	analyzer := NewQueryAnalyzer(storage)
+	analyzer := newQueryAnalyzer(storage)
 	Walk(analyzer, node)
 	analyzeTimer.Stop()

 	preloadTimer := queryStats.GetTimer(stats.PreloadTime).Start()
 	p := storage.NewPreloader()
-	for fp, rangeDuration := range analyzer.FullRanges {
-		if et := totalTimer.ElapsedTime(); et > *queryTimeout {
-			preloadTimer.Stop()
-			p.Close()
-			return nil, queryTimeoutError{et}
+	for offset, pt := range analyzer.offsetPreloadTimes {
+		ts := timestamp.Add(-offset)
+		for fp, rangeDuration := range pt.ranges {
+			if et := totalTimer.ElapsedTime(); et > *queryTimeout {
+				preloadTimer.Stop()
+				p.Close()
+				return nil, queryTimeoutError{et}
+			}
+			if err := p.PreloadRange(fp, ts.Add(-rangeDuration), ts, *stalenessDelta); err != nil {
+				preloadTimer.Stop()
+				p.Close()
+				return nil, err
+			}
 		}
-		if err := p.PreloadRange(fp, timestamp.Add(-rangeDuration), timestamp, *stalenessDelta); err != nil {
-			preloadTimer.Stop()
-			p.Close()
-			return nil, err
-		}
-	}
-	for fp := range analyzer.IntervalRanges {
-		if et := totalTimer.ElapsedTime(); et > *queryTimeout {
-			preloadTimer.Stop()
-			p.Close()
-			return nil, queryTimeoutError{et}
-		}
-		if err := p.PreloadRange(fp, timestamp, timestamp, *stalenessDelta); err != nil {
-			preloadTimer.Stop()
-			p.Close()
-			return nil, err
+		for fp := range pt.instants {
+			if et := totalTimer.ElapsedTime(); et > *queryTimeout {
+				preloadTimer.Stop()
+				p.Close()
+				return nil, queryTimeoutError{et}
+			}
+			if err := p.PreloadRange(fp, ts, ts, *stalenessDelta); err != nil {
+				preloadTimer.Stop()
+				p.Close()
+				return nil, err
+			}
 		}
 	}
 	preloadTimer.Stop()
@ -157,47 +171,51 @@ func prepareRangeQuery(node Node, start clientmodel.Timestamp, end clientmodel.T
 	totalTimer := queryStats.GetTimer(stats.TotalEvalTime)

 	analyzeTimer := queryStats.GetTimer(stats.QueryAnalysisTime).Start()
-	analyzer := NewQueryAnalyzer(storage)
+	analyzer := newQueryAnalyzer(storage)
 	Walk(analyzer, node)
 	analyzeTimer.Stop()

 	preloadTimer := queryStats.GetTimer(stats.PreloadTime).Start()
 	p := storage.NewPreloader()
-	for fp, rangeDuration := range analyzer.FullRanges {
-		if et := totalTimer.ElapsedTime(); et > *queryTimeout {
-			preloadTimer.Stop()
-			p.Close()
-			return nil, queryTimeoutError{et}
-		}
-		if err := p.PreloadRange(fp, start.Add(-rangeDuration), end, *stalenessDelta); err != nil {
-			preloadTimer.Stop()
-			p.Close()
-			return nil, err
-		}
-		/*
-			if interval < rangeDuration {
-				if err := p.GetMetricRange(fp, end, end.Sub(start)+rangeDuration); err != nil {
-					p.Close()
-					return nil, err
-				}
-			} else {
-				if err := p.GetMetricRangeAtInterval(fp, start, end, interval, rangeDuration); err != nil {
-					p.Close()
-					return nil, err
-				}
+	for offset, pt := range analyzer.offsetPreloadTimes {
+		offsetStart := start.Add(-offset)
+		offsetEnd := end.Add(-offset)
+		for fp, rangeDuration := range pt.ranges {
+			if et := totalTimer.ElapsedTime(); et > *queryTimeout {
+				preloadTimer.Stop()
+				p.Close()
+				return nil, queryTimeoutError{et}
 			}
-		*/
-	}
-	for fp := range analyzer.IntervalRanges {
-		if et := totalTimer.ElapsedTime(); et > *queryTimeout {
-			preloadTimer.Stop()
-			p.Close()
-			return nil, queryTimeoutError{et}
+			if err := p.PreloadRange(fp, offsetStart.Add(-rangeDuration), offsetEnd, *stalenessDelta); err != nil {
+				preloadTimer.Stop()
+				p.Close()
+				return nil, err
+			}
+			/*
+				if interval < rangeDuration {
+					if err := p.GetMetricRange(fp, offsetEnd, offsetEnd.Sub(offsetStart)+rangeDuration); err != nil {
+						p.Close()
+						return nil, err
+					}
+				} else {
+					if err := p.GetMetricRangeAtInterval(fp, offsetStart, offsetEnd, interval, rangeDuration); err != nil {
+						p.Close()
+						return nil, err
+					}
+				}
+			*/
 		}
-		if err := p.PreloadRange(fp, start, end, *stalenessDelta); err != nil {
-			preloadTimer.Stop()
-			p.Close()
-			return nil, err
+		for fp := range pt.instants {
+			if et := totalTimer.ElapsedTime(); et > *queryTimeout {
+				preloadTimer.Stop()
+				p.Close()
+				return nil, queryTimeoutError{et}
+			}
+			if err := p.PreloadRange(fp, offsetStart, offsetEnd, *stalenessDelta); err != nil {
+				preloadTimer.Stop()
+				p.Close()
+				return nil, err
+			}
 		}
 	}
 	preloadTimer.Stop()
--- a/rules/ast/walk.go
+++ b/rules/ast/walk.go
@ -13,16 +13,16 @@

 package ast

-// Visitor is the interface for a Node visitor.
-type Visitor interface {
-	Visit(node Node)
+// visitor is the interface for a Node visitor.
+type visitor interface {
+	visit(node Node)
 }

 // Walk does a depth-first traversal of the AST, starting at node,
-// calling visitor.Visit for each encountered Node in the tree.
-func Walk(visitor Visitor, node Node) {
-	visitor.Visit(node)
+// calling visitor.visit for each encountered Node in the tree.
+func Walk(v visitor, node Node) {
+	v.visit(node)
 	for _, childNode := range node.Children() {
-		Walk(visitor, childNode)
+		Walk(v, childNode)
 	}
 }
--- a/rules/helpers.go
+++ b/rules/helpers.go
@ -110,22 +110,30 @@ func NewArithExpr(opTypeStr string, lhs ast.Node, rhs ast.Node) (ast.Node, error
 	return expr, nil
 }

-// NewMatrixSelector is a convenience function to create a new AST matrix selector.
-func NewMatrixSelector(vector ast.Node, intervalStr string) (ast.MatrixNode, error) {
-	switch vector.(type) {
-	case *ast.VectorSelector:
-		{
-			break
-		}
-	default:
-		return nil, fmt.Errorf("intervals are currently only supported for vector selectors")
+// NewVectorSelector is a convenience function to create a new AST vector selector.
+func NewVectorSelector(m metric.LabelMatchers, offsetStr string) (ast.VectorNode, error) {
+	offset, err := utility.StringToDuration(offsetStr)
+	if err != nil {
+		return nil, err
 	}
+	return ast.NewVectorSelector(m, offset), nil
+}
+
+// NewMatrixSelector is a convenience function to create a new AST matrix selector.
+func NewMatrixSelector(vector ast.Node, intervalStr string, offsetStr string) (ast.MatrixNode, error) {
 	interval, err := utility.StringToDuration(intervalStr)
 	if err != nil {
 		return nil, err
 	}
-	vectorSelector := vector.(*ast.VectorSelector)
-	return ast.NewMatrixSelector(vectorSelector, interval), nil
+	offset, err := utility.StringToDuration(offsetStr)
+	if err != nil {
+		return nil, err
+	}
+	vectorSelector, ok := vector.(*ast.VectorSelector)
+	if !ok {
+		return nil, fmt.Errorf("intervals are currently only supported for vector selectors")
+	}
+	return ast.NewMatrixSelector(vectorSelector, interval, offset), nil
 }

 func newLabelMatcher(matchTypeStr string, name clientmodel.LabelName, value clientmodel.LabelValue) (*metric.LabelMatcher, error) {
--- a/rules/lexer.l
+++ b/rules/lexer.l
@ -80,6 +80,7 @@ DESCRIPTION|description  return DESCRIPTION
 PERMANENT|permanent      return PERMANENT
 BY|by                    return GROUP_OP
 KEEPING_EXTRA|keeping_extra return KEEPING_EXTRA
+OFFSET|offset            return OFFSET
 AVG|SUM|MAX|MIN|COUNT    lval.str = lexer.token(); return AGGR_OP
 avg|sum|max|min|count    lval.str = strings.ToUpper(lexer.token()); return AGGR_OP
 \<|>|AND|OR|and|or       lval.str = strings.ToUpper(lexer.token()); return CMP_OP
--- a/rules/lexer.l.go
+++ b/rules/lexer.l.go
--- a/rules/parser.y
+++ b/rules/parser.y
@ -42,7 +42,7 @@

 %token <str> IDENTIFIER STRING DURATION METRICNAME
 %token <num> NUMBER
-%token PERMANENT GROUP_OP KEEPING_EXTRA
+%token PERMANENT GROUP_OP KEEPING_EXTRA OFFSET
 %token <str> AGGR_OP CMP_OP ADDITIVE_OP MULT_OP
 %token ALERT IF FOR WITH SUMMARY DESCRIPTION

@ -53,7 +53,7 @@
 %type <labelMatchers> label_match_list label_matches
 %type <ruleNode> rule_expr func_arg
 %type <boolean> qualifier extra_labels_opts
-%type <str> for_duration metric_name label_match_type
+%type <str> for_duration metric_name label_match_type offset_opts

 %right '='
 %left CMP_OP
@ -152,17 +152,28 @@ label_match_type   : '='
                     { $$ = $1 }
                   ;

+offset_opts        : /* empty */
+                     { $$ = "0s" }
+                   | OFFSET DURATION
+                     { $$ = $2 }
+                   ;
+
 rule_expr          : '(' rule_expr ')'
                     { $$ = $2 }
-                   | '{' label_match_list '}'
-                     { $$ = ast.NewVectorSelector($2) }
-                   | metric_name label_matches
+                   | '{' label_match_list '}' offset_opts
+                     {
+                       var err error
+                       $$, err = NewVectorSelector($2, $4)
+                       if err != nil { yylex.Error(err.Error()); return 1 }
+                     }
+                   | metric_name label_matches offset_opts
                     {
                       var err error
                       m, err := metric.NewLabelMatcher(metric.Equal, clientmodel.MetricNameLabel, clientmodel.LabelValue($1))
                       if err != nil { yylex.Error(err.Error()); return 1 }
                       $2 = append($2, m)
-                       $$ = ast.NewVectorSelector($2)
+                       $$, err = NewVectorSelector($2, $3)
+                       if err != nil { yylex.Error(err.Error()); return 1 }
                     }
                   | IDENTIFIER '(' func_arg_list ')'
                     {
@ -176,10 +187,10 @@ rule_expr          : '(' rule_expr ')'
                       $$, err = NewFunctionCall($1, []ast.Node{})
                       if err != nil { yylex.Error(err.Error()); return 1 }
                     }
-                   | rule_expr '[' DURATION ']'
+                   | rule_expr '[' DURATION ']' offset_opts
                     {
                       var err error
-                       $$, err = NewMatrixSelector($1, $3)
+                       $$, err = NewMatrixSelector($1, $3, $5)
                       if err != nil { yylex.Error(err.Error()); return 1 }
                     }
                   | AGGR_OP '(' rule_expr ')' grouping_opts extra_labels_opts
--- a/rules/parser.y.go
+++ b/rules/parser.y.go
@ -35,16 +35,17 @@ const NUMBER = 57352
 const PERMANENT = 57353
 const GROUP_OP = 57354
 const KEEPING_EXTRA = 57355
-const AGGR_OP = 57356
-const CMP_OP = 57357
-const ADDITIVE_OP = 57358
-const MULT_OP = 57359
-const ALERT = 57360
-const IF = 57361
-const FOR = 57362
-const WITH = 57363
-const SUMMARY = 57364
-const DESCRIPTION = 57365
+const OFFSET = 57356
+const AGGR_OP = 57357
+const CMP_OP = 57358
+const ADDITIVE_OP = 57359
+const MULT_OP = 57360
+const ALERT = 57361
+const IF = 57362
+const FOR = 57363
+const WITH = 57364
+const SUMMARY = 57365
+const DESCRIPTION = 57366

 var yyToknames = []string{
 	"START_RULES",
@ -57,6 +58,7 @@ var yyToknames = []string{
 	"PERMANENT",
 	"GROUP_OP",
 	"KEEPING_EXTRA",
+	"OFFSET",
 	"AGGR_OP",
 	"CMP_OP",
 	"ADDITIVE_OP",
@ -75,7 +77,7 @@ const yyEofCode = 1
 const yyErrCode = 2
 const yyMaxDepth = 200

-//line parser.y:250
+//line parser.y:261

 //line yacctab:1
 var yyExca = []int{
@ -87,91 +89,97 @@ var yyExca = []int{
 	-2, 10,
 }

-const yyNprod = 50
+const yyNprod = 52
 const yyPrivate = 57344

 var yyTokenNames []string
 var yyStates []string

-const yyLast = 137
+const yyLast = 142

 var yyAct = []int{

-	56, 72, 50, 53, 30, 24, 6, 20, 49, 59,
-	22, 10, 51, 18, 13, 12, 21, 19, 20, 11,
-	18, 85, 36, 37, 38, 21, 19, 20, 81, 82,
-	8, 18, 52, 7, 48, 66, 21, 19, 20, 87,
-	18, 10, 51, 31, 13, 12, 60, 55, 28, 11,
-	65, 18, 21, 19, 20, 57, 21, 19, 20, 29,
-	8, 74, 23, 7, 62, 40, 39, 18, 73, 77,
-	76, 18, 80, 75, 10, 19, 20, 13, 12, 79,
-	86, 78, 11, 64, 89, 63, 41, 40, 71, 18,
-	46, 25, 93, 8, 44, 27, 7, 83, 69, 96,
-	94, 91, 58, 43, 9, 17, 54, 31, 92, 35,
-	33, 45, 16, 13, 97, 95, 90, 61, 73, 88,
-	32, 68, 25, 34, 2, 3, 14, 5, 4, 1,
-	42, 84, 15, 26, 70, 67, 47,
+	58, 76, 55, 52, 51, 30, 45, 6, 24, 20,
+	61, 22, 10, 53, 18, 13, 12, 84, 68, 83,
+	67, 11, 18, 36, 37, 38, 21, 19, 20, 21,
+	19, 20, 8, 54, 90, 7, 50, 21, 19, 20,
+	92, 18, 10, 53, 18, 13, 12, 70, 63, 62,
+	88, 11, 18, 57, 31, 21, 19, 20, 86, 87,
+	66, 40, 8, 10, 78, 7, 13, 12, 79, 69,
+	18, 29, 11, 80, 82, 81, 28, 85, 21, 19,
+	20, 19, 20, 8, 91, 77, 7, 41, 40, 94,
+	25, 23, 39, 18, 59, 18, 44, 98, 27, 73,
+	101, 99, 60, 96, 17, 43, 75, 9, 46, 56,
+	31, 47, 16, 33, 97, 102, 13, 65, 35, 48,
+	100, 95, 64, 32, 77, 93, 72, 25, 34, 2,
+	3, 14, 5, 4, 1, 42, 89, 15, 26, 74,
+	71, 49,
 }
 var yyPact = []int{

-	120, -1000, -1000, 68, 94, -1000, 41, 68, 116, 70,
-	20, 31, -1000, -1000, -1000, 104, 117, -1000, 101, 68,
-	68, 68, 37, 60, -1000, 79, -1000, 85, 5, 68,
-	93, 19, 30, -1000, 83, -22, -10, -17, 59, -1000,
-	116, -1000, 110, -1000, -1000, -1000, 38, 56, -1000, -1000,
-	41, -1000, 21, 7, -1000, 115, 74, 62, 68, -1000,
-	-1000, -1000, -1000, -1000, 35, 95, 68, 52, -1000, 68,
-	2, -1000, -1000, 73, 1, -1000, 93, 10, -1000, 113,
-	41, -1000, 112, 109, 80, 100, -1000, -1000, -1000, -1000,
-	-1000, 30, -1000, 78, 108, 76, 107, -1000,
+	125, -1000, -1000, 57, 93, -1000, 21, 57, 121, 72,
+	47, 42, -1000, -1000, -1000, 107, 122, -1000, 110, 57,
+	57, 57, 62, 60, -1000, 80, 94, 84, 6, 57,
+	96, 24, 68, -1000, 82, -22, -9, -17, 64, -1000,
+	121, 94, 115, -1000, -1000, -1000, 109, -1000, 33, -10,
+	-1000, -1000, 21, -1000, 39, 18, -1000, 120, 74, 79,
+	57, 94, -1000, -1000, -1000, -1000, -1000, -1000, 36, 98,
+	57, -11, -1000, 57, 31, -1000, -1000, 25, 13, -1000,
+	-1000, 96, 10, -1000, 119, 21, -1000, 118, 114, 81,
+	106, -1000, -1000, -1000, -1000, -1000, 68, -1000, 78, 113,
+	76, 108, -1000,
 }
 var yyPgo = []int{

-	0, 136, 135, 4, 1, 134, 0, 5, 62, 133,
-	2, 8, 132, 3, 131, 104, 130, 129, 128, 127,
-	126,
+	0, 141, 140, 5, 1, 139, 0, 8, 91, 138,
+	3, 4, 137, 2, 136, 107, 135, 6, 134, 133,
+	132, 131,
 }
 var yyR1 = []int{

-	0, 17, 17, 18, 18, 19, 20, 20, 14, 14,
+	0, 18, 18, 19, 19, 20, 21, 21, 14, 14,
 	12, 12, 15, 15, 6, 6, 6, 5, 5, 4,
-	9, 9, 9, 8, 8, 7, 16, 16, 10, 10,
+	9, 9, 9, 8, 8, 7, 16, 16, 17, 17,
 	10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
-	13, 13, 3, 3, 2, 2, 1, 1, 11, 11,
+	10, 10, 13, 13, 3, 3, 2, 2, 1, 1,
+	11, 11,
 }
 var yyR2 = []int{

 	0, 2, 2, 0, 2, 1, 5, 11, 0, 2,
 	0, 1, 1, 1, 0, 3, 2, 1, 3, 3,
-	0, 2, 3, 1, 3, 3, 1, 1, 3, 3,
-	2, 4, 3, 4, 6, 6, 3, 3, 3, 1,
-	0, 1, 0, 4, 1, 3, 1, 3, 1, 1,
+	0, 2, 3, 1, 3, 3, 1, 1, 0, 2,
+	3, 4, 3, 4, 3, 5, 6, 6, 3, 3,
+	3, 1, 0, 1, 0, 4, 1, 3, 1, 3,
+	1, 1,
 }
 var yyChk = []int{

-	-1000, -17, 4, 5, -18, -19, -10, 28, 25, -15,
-	6, 14, 10, 9, -20, -12, 18, 11, 30, 16,
-	17, 15, -10, -8, -7, 6, -9, 25, 28, 28,
-	-3, 12, -15, 6, 6, 8, -10, -10, -10, 29,
-	27, 26, -16, 24, 15, 26, -8, -1, 29, -11,
-	-10, 7, -10, -13, 13, 28, -6, 25, 19, 31,
-	-7, 7, 26, 29, 27, 29, 28, -2, 6, 24,
-	-5, 26, -4, 6, -10, -11, -3, -10, 29, 27,
-	-10, 26, 27, 24, -14, 20, -13, 29, 6, -4,
-	7, 21, 8, -6, 22, 7, 23, 7,
+	-1000, -18, 4, 5, -19, -20, -10, 29, 26, -15,
+	6, 15, 10, 9, -21, -12, 19, 11, 31, 17,
+	18, 16, -10, -8, -7, 6, -9, 26, 29, 29,
+	-3, 12, -15, 6, 6, 8, -10, -10, -10, 30,
+	28, 27, -16, 25, 16, -17, 14, 27, -8, -1,
+	30, -11, -10, 7, -10, -13, 13, 29, -6, 26,
+	20, 32, -7, -17, 7, 8, 27, 30, 28, 30,
+	29, -2, 6, 25, -5, 27, -4, 6, -10, -17,
+	-11, -3, -10, 30, 28, -10, 27, 28, 25, -14,
+	21, -13, 30, 6, -4, 7, 22, 8, -6, 23,
+	7, 24, 7,
 }
 var yyDef = []int{

 	0, -2, 3, 0, -2, 2, 5, 0, 0, 20,
-	13, 42, 39, 12, 4, 0, 0, 11, 0, 0,
-	0, 0, 0, 0, 23, 0, 30, 0, 0, 0,
-	40, 0, 14, 13, 0, 0, 36, 37, 38, 28,
-	0, 29, 0, 26, 27, 21, 0, 0, 32, 46,
-	48, 49, 0, 0, 41, 0, 0, 0, 0, 33,
-	24, 25, 22, 31, 0, 42, 0, 0, 44, 0,
-	0, 16, 17, 0, 8, 47, 40, 0, 43, 0,
-	6, 15, 0, 0, 0, 0, 34, 35, 45, 18,
-	19, 14, 9, 0, 0, 0, 0, 7,
+	13, 44, 41, 12, 4, 0, 0, 11, 0, 0,
+	0, 0, 0, 0, 23, 0, 28, 0, 0, 0,
+	42, 0, 14, 13, 0, 0, 38, 39, 40, 30,
+	0, 28, 0, 26, 27, 32, 0, 21, 0, 0,
+	34, 48, 50, 51, 0, 0, 43, 0, 0, 0,
+	0, 28, 24, 31, 25, 29, 22, 33, 0, 44,
+	0, 0, 46, 0, 0, 16, 17, 0, 8, 35,
+	49, 42, 0, 45, 0, 6, 15, 0, 0, 0,
+	0, 36, 37, 47, 18, 19, 14, 9, 0, 0,
+	0, 0, 7,
 }
 var yyTok1 = []int{

@ -179,21 +187,21 @@ var yyTok1 = []int{
 	3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
 	3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
 	3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
-	28, 29, 3, 3, 27, 3, 3, 3, 3, 3,
+	29, 30, 3, 3, 28, 3, 3, 3, 3, 3,
 	3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
-	3, 24, 3, 3, 3, 3, 3, 3, 3, 3,
+	3, 25, 3, 3, 3, 3, 3, 3, 3, 3,
 	3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
 	3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
-	3, 30, 3, 31, 3, 3, 3, 3, 3, 3,
+	3, 31, 3, 32, 3, 3, 3, 3, 3, 3,
 	3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
 	3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
-	3, 3, 3, 25, 3, 26,
+	3, 3, 3, 26, 3, 27,
 }
 var yyTok2 = []int{

 	2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
 	12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
-	22, 23,
+	22, 23, 24,
 }
 var yyTok3 = []int{
 	0,
@ -559,27 +567,46 @@ yydefault:
 	case 28:
 		//line parser.y:156
 		{
-			yyVAL.ruleNode = yyS[yypt-1].ruleNode
+			yyVAL.str = "0s"
 		}
 	case 29:
 		//line parser.y:158
 		{
-			yyVAL.ruleNode = ast.NewVectorSelector(yyS[yypt-1].labelMatchers)
+			yyVAL.str = yyS[yypt-0].str
 		}
 	case 30:
-		//line parser.y:160
+		//line parser.y:162
+		{
+			yyVAL.ruleNode = yyS[yypt-1].ruleNode
+		}
+	case 31:
+		//line parser.y:164
 		{
 			var err error
-			m, err := metric.NewLabelMatcher(metric.Equal, clientmodel.MetricNameLabel, clientmodel.LabelValue(yyS[yypt-1].str))
+			yyVAL.ruleNode, err = NewVectorSelector(yyS[yypt-2].labelMatchers, yyS[yypt-0].str)
 			if err != nil {
 				yylex.Error(err.Error())
 				return 1
 			}
-			yyS[yypt-0].labelMatchers = append(yyS[yypt-0].labelMatchers, m)
-			yyVAL.ruleNode = ast.NewVectorSelector(yyS[yypt-0].labelMatchers)
 		}
-	case 31:
-		//line parser.y:168
+	case 32:
+		//line parser.y:170
+		{
+			var err error
+			m, err := metric.NewLabelMatcher(metric.Equal, clientmodel.MetricNameLabel, clientmodel.LabelValue(yyS[yypt-2].str))
+			if err != nil {
+				yylex.Error(err.Error())
+				return 1
+			}
+			yyS[yypt-1].labelMatchers = append(yyS[yypt-1].labelMatchers, m)
+			yyVAL.ruleNode, err = NewVectorSelector(yyS[yypt-1].labelMatchers, yyS[yypt-0].str)
+			if err != nil {
+				yylex.Error(err.Error())
+				return 1
+			}
+		}
+	case 33:
+		//line parser.y:179
 		{
 			var err error
 			yyVAL.ruleNode, err = NewFunctionCall(yyS[yypt-3].str, yyS[yypt-1].ruleNodeSlice)
@ -588,8 +615,8 @@ yydefault:
 				return 1
 			}
 		}
-	case 32:
-		//line parser.y:174
+	case 34:
+		//line parser.y:185
 		{
 			var err error
 			yyVAL.ruleNode, err = NewFunctionCall(yyS[yypt-2].str, []ast.Node{})
@ -598,18 +625,18 @@ yydefault:
 				return 1
 			}
 		}
-	case 33:
-		//line parser.y:180
+	case 35:
+		//line parser.y:191
 		{
 			var err error
-			yyVAL.ruleNode, err = NewMatrixSelector(yyS[yypt-3].ruleNode, yyS[yypt-1].str)
+			yyVAL.ruleNode, err = NewMatrixSelector(yyS[yypt-4].ruleNode, yyS[yypt-2].str, yyS[yypt-0].str)
 			if err != nil {
 				yylex.Error(err.Error())
 				return 1
 			}
 		}
-	case 34:
-		//line parser.y:186
+	case 36:
+		//line parser.y:197
 		{
 			var err error
 			yyVAL.ruleNode, err = NewVectorAggregation(yyS[yypt-5].str, yyS[yypt-3].ruleNode, yyS[yypt-1].labelNameSlice, yyS[yypt-0].boolean)
@ -618,8 +645,8 @@ yydefault:
 				return 1
 			}
 		}
-	case 35:
-		//line parser.y:192
+	case 37:
+		//line parser.y:203
 		{
 			var err error
 			yyVAL.ruleNode, err = NewVectorAggregation(yyS[yypt-5].str, yyS[yypt-1].ruleNode, yyS[yypt-4].labelNameSlice, yyS[yypt-3].boolean)
@ -628,28 +655,8 @@ yydefault:
 				return 1
 			}
 		}
-	case 36:
-		//line parser.y:200
-		{
-			var err error
-			yyVAL.ruleNode, err = NewArithExpr(yyS[yypt-1].str, yyS[yypt-2].ruleNode, yyS[yypt-0].ruleNode)
-			if err != nil {
-				yylex.Error(err.Error())
-				return 1
-			}
-		}
-	case 37:
-		//line parser.y:206
-		{
-			var err error
-			yyVAL.ruleNode, err = NewArithExpr(yyS[yypt-1].str, yyS[yypt-2].ruleNode, yyS[yypt-0].ruleNode)
-			if err != nil {
-				yylex.Error(err.Error())
-				return 1
-			}
-		}
 	case 38:
-		//line parser.y:212
+		//line parser.y:211
 		{
 			var err error
 			yyVAL.ruleNode, err = NewArithExpr(yyS[yypt-1].str, yyS[yypt-2].ruleNode, yyS[yypt-0].ruleNode)
@ -659,57 +666,77 @@ yydefault:
 			}
 		}
 	case 39:
-		//line parser.y:218
+		//line parser.y:217
+		{
+			var err error
+			yyVAL.ruleNode, err = NewArithExpr(yyS[yypt-1].str, yyS[yypt-2].ruleNode, yyS[yypt-0].ruleNode)
+			if err != nil {
+				yylex.Error(err.Error())
+				return 1
+			}
+		}
+	case 40:
+		//line parser.y:223
+		{
+			var err error
+			yyVAL.ruleNode, err = NewArithExpr(yyS[yypt-1].str, yyS[yypt-2].ruleNode, yyS[yypt-0].ruleNode)
+			if err != nil {
+				yylex.Error(err.Error())
+				return 1
+			}
+		}
+	case 41:
+		//line parser.y:229
 		{
 			yyVAL.ruleNode = ast.NewScalarLiteral(yyS[yypt-0].num)
 		}
-	case 40:
-		//line parser.y:222
+	case 42:
+		//line parser.y:233
 		{
 			yyVAL.boolean = false
 		}
-	case 41:
-		//line parser.y:224
+	case 43:
+		//line parser.y:235
 		{
 			yyVAL.boolean = true
 		}
-	case 42:
-		//line parser.y:228
+	case 44:
+		//line parser.y:239
 		{
 			yyVAL.labelNameSlice = clientmodel.LabelNames{}
 		}
-	case 43:
-		//line parser.y:230
+	case 45:
+		//line parser.y:241
 		{
 			yyVAL.labelNameSlice = yyS[yypt-1].labelNameSlice
 		}
-	case 44:
-		//line parser.y:234
+	case 46:
+		//line parser.y:245
 		{
 			yyVAL.labelNameSlice = clientmodel.LabelNames{clientmodel.LabelName(yyS[yypt-0].str)}
 		}
-	case 45:
-		//line parser.y:236
+	case 47:
+		//line parser.y:247
 		{
 			yyVAL.labelNameSlice = append(yyVAL.labelNameSlice, clientmodel.LabelName(yyS[yypt-0].str))
 		}
-	case 46:
-		//line parser.y:240
+	case 48:
+		//line parser.y:251
 		{
 			yyVAL.ruleNodeSlice = []ast.Node{yyS[yypt-0].ruleNode}
 		}
-	case 47:
-		//line parser.y:242
+	case 49:
+		//line parser.y:253
 		{
 			yyVAL.ruleNodeSlice = append(yyVAL.ruleNodeSlice, yyS[yypt-0].ruleNode)
 		}
-	case 48:
-		//line parser.y:246
+	case 50:
+		//line parser.y:257
 		{
 			yyVAL.ruleNode = yyS[yypt-0].ruleNode
 		}
-	case 49:
-		//line parser.y:248
+	case 51:
+		//line parser.y:259
 		{
 			yyVAL.ruleNode = ast.NewStringLiteral(yyS[yypt-0].str)
 		}
--- a/rules/rules_test.go
+++ b/rules/rules_test.go
@ -62,42 +62,32 @@ func newTestStorage(t testing.TB) (storage local.Storage, closer test.Closer) {
 func TestExpressions(t *testing.T) {
 	// Labels in expected output need to be alphabetically sorted.
 	expressionTests := []struct {
-		expr           string
-		output         []string
-		shouldFail     bool
-		checkOrder     bool
-		fullRanges     int
-		intervalRanges int
+		expr       string
+		output     []string
+		shouldFail bool
+		checkOrder bool
 	}{
 		{
-			expr:           `SUM(http_requests)`,
-			output:         []string{`{} => 3600 @[%v]`},
-			fullRanges:     0,
-			intervalRanges: 8,
+			expr:   `SUM(http_requests)`,
+			output: []string{`{} => 3600 @[%v]`},
 		}, {
 			expr: `SUM(http_requests{instance="0"}) BY(job)`,
 			output: []string{
 				`{job="api-server"} => 400 @[%v]`,
 				`{job="app-server"} => 1200 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 4,
 		}, {
 			expr: `SUM(http_requests{instance="0"}) BY(job) KEEPING_EXTRA`,
 			output: []string{
 				`{instance="0", job="api-server"} => 400 @[%v]`,
 				`{instance="0", job="app-server"} => 1200 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 4,
 		}, {
 			expr: `SUM(http_requests) BY (job)`,
 			output: []string{
 				`{job="api-server"} => 1000 @[%v]`,
 				`{job="app-server"} => 2600 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			// Non-existent labels mentioned in BY-clauses shouldn't propagate to output.
 			expr: `SUM(http_requests) BY (job, nonexistent)`,
@ -105,8 +95,6 @@ func TestExpressions(t *testing.T) {
 				`{job="api-server"} => 1000 @[%v]`,
 				`{job="app-server"} => 2600 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `
 				// Test comment.
@ -116,16 +104,12 @@ func TestExpressions(t *testing.T) {
 				`{job="api-server"} => 1000 @[%v]`,
 				`{job="app-server"} => 2600 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `COUNT(http_requests) BY (job)`,
 			output: []string{
 				`{job="api-server"} => 4 @[%v]`,
 				`{job="app-server"} => 4 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `SUM(http_requests) BY (job, group)`,
 			output: []string{
@ -134,139 +118,103 @@ func TestExpressions(t *testing.T) {
 				`{group="production", job="api-server"} => 300 @[%v]`,
 				`{group="production", job="app-server"} => 1100 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `AVG(http_requests) BY (job)`,
 			output: []string{
 				`{job="api-server"} => 250 @[%v]`,
 				`{job="app-server"} => 650 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `MIN(http_requests) BY (job)`,
 			output: []string{
 				`{job="api-server"} => 100 @[%v]`,
 				`{job="app-server"} => 500 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `MAX(http_requests) BY (job)`,
 			output: []string{
 				`{job="api-server"} => 400 @[%v]`,
 				`{job="app-server"} => 800 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `SUM(http_requests) BY (job) - COUNT(http_requests) BY (job)`,
 			output: []string{
 				`{job="api-server"} => 996 @[%v]`,
 				`{job="app-server"} => 2596 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `2 - SUM(http_requests) BY (job)`,
 			output: []string{
 				`{job="api-server"} => -998 @[%v]`,
 				`{job="app-server"} => -2598 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `1000 / SUM(http_requests) BY (job)`,
 			output: []string{
 				`{job="api-server"} => 1 @[%v]`,
 				`{job="app-server"} => 0.38461538461538464 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `SUM(http_requests) BY (job) - 2`,
 			output: []string{
 				`{job="api-server"} => 998 @[%v]`,
 				`{job="app-server"} => 2598 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `SUM(http_requests) BY (job) % 3`,
 			output: []string{
 				`{job="api-server"} => 1 @[%v]`,
 				`{job="app-server"} => 2 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `SUM(http_requests) BY (job) / 0`,
 			output: []string{
 				`{job="api-server"} => +Inf @[%v]`,
 				`{job="app-server"} => +Inf @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `SUM(http_requests) BY (job) > 1000`,
 			output: []string{
 				`{job="app-server"} => 2600 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `1000 < SUM(http_requests) BY (job)`,
 			output: []string{
 				`{job="app-server"} => 1000 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `SUM(http_requests) BY (job) <= 1000`,
 			output: []string{
 				`{job="api-server"} => 1000 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `SUM(http_requests) BY (job) != 1000`,
 			output: []string{
 				`{job="app-server"} => 2600 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `SUM(http_requests) BY (job) == 1000`,
 			output: []string{
 				`{job="api-server"} => 1000 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `SUM(http_requests) BY (job) + SUM(http_requests) BY (job)`,
 			output: []string{
 				`{job="api-server"} => 2000 @[%v]`,
 				`{job="app-server"} => 5200 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			expr: `http_requests{job="api-server", group="canary"}`,
 			output: []string{
 				`http_requests{group="canary", instance="0", job="api-server"} => 300 @[%v]`,
 				`http_requests{group="canary", instance="1", job="api-server"} => 400 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		}, {
 			expr: `http_requests{job="api-server", group="canary"} + rate(http_requests{job="api-server"}[5m]) * 5 * 60`,
 			output: []string{
 				`{group="canary", instance="0", job="api-server"} => 330 @[%v]`,
 				`{group="canary", instance="1", job="api-server"} => 440 @[%v]`,
 			},
-			fullRanges:     4,
-			intervalRanges: 0,
 		}, {
 			expr: `rate(http_requests[25m]) * 25 * 60`,
 			output: []string{
@ -279,8 +227,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="1", job="api-server"} => 100 @[%v]`,
 				`{group="production", instance="1", job="app-server"} => 300 @[%v]`,
 			},
-			fullRanges:     8,
-			intervalRanges: 0,
 		}, {
 			expr: `delta(http_requests[25m], 1)`,
 			output: []string{
@ -293,8 +239,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="1", job="api-server"} => 100 @[%v]`,
 				`{group="production", instance="1", job="app-server"} => 300 @[%v]`,
 			},
-			fullRanges:     8,
-			intervalRanges: 0,
 		}, {
 			expr: `sort(http_requests)`,
 			output: []string{
@ -307,9 +251,7 @@ func TestExpressions(t *testing.T) {
 				`http_requests{group="canary", instance="0", job="app-server"} => 700 @[%v]`,
 				`http_requests{group="canary", instance="1", job="app-server"} => 800 @[%v]`,
 			},
-			checkOrder:     true,
-			fullRanges:     0,
-			intervalRanges: 8,
+			checkOrder: true,
 		}, {
 			expr: `sort_desc(http_requests)`,
 			output: []string{
@ -322,9 +264,7 @@ func TestExpressions(t *testing.T) {
 				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
 				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
 			},
-			checkOrder:     true,
-			fullRanges:     0,
-			intervalRanges: 8,
+			checkOrder: true,
 		}, {
 			expr: `topk(3, http_requests)`,
 			output: []string{
@ -332,18 +272,14 @@ func TestExpressions(t *testing.T) {
 				`http_requests{group="canary", instance="0", job="app-server"} => 700 @[%v]`,
 				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
 			},
-			checkOrder:     true,
-			fullRanges:     0,
-			intervalRanges: 8,
+			checkOrder: true,
 		}, {
 			expr: `topk(5, http_requests{group="canary",job="app-server"})`,
 			output: []string{
 				`http_requests{group="canary", instance="1", job="app-server"} => 800 @[%v]`,
 				`http_requests{group="canary", instance="0", job="app-server"} => 700 @[%v]`,
 			},
-			checkOrder:     true,
-			fullRanges:     0,
-			intervalRanges: 2,
+			checkOrder: true,
 		}, {
 			expr: `bottomk(3, http_requests)`,
 			output: []string{
@ -351,26 +287,20 @@ func TestExpressions(t *testing.T) {
 				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
 				`http_requests{group="canary", instance="0", job="api-server"} => 300 @[%v]`,
 			},
-			checkOrder:     true,
-			fullRanges:     0,
-			intervalRanges: 8,
+			checkOrder: true,
 		}, {
 			expr: `bottomk(5, http_requests{group="canary",job="app-server"})`,
 			output: []string{
 				`http_requests{group="canary", instance="0", job="app-server"} => 700 @[%v]`,
 				`http_requests{group="canary", instance="1", job="app-server"} => 800 @[%v]`,
 			},
-			checkOrder:     true,
-			fullRanges:     0,
-			intervalRanges: 2,
+			checkOrder: true,
 		}, {
 			// Single-letter label names and values.
 			expr: `x{y="testvalue"}`,
 			output: []string{
 				`x{y="testvalue"} => 100 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 1,
 		}, {
 			// Lower-cased aggregation operators should work too.
 			expr: `sum(http_requests) by (job) + min(http_requests) by (job) + max(http_requests) by (job) + avg(http_requests) by (job)`,
@ -378,62 +308,42 @@ func TestExpressions(t *testing.T) {
 				`{job="app-server"} => 4550 @[%v]`,
 				`{job="api-server"} => 1750 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		}, {
 			// Deltas should be adjusted for target interval vs. samples under target interval.
-			expr:           `delta(http_requests{group="canary", instance="1", job="app-server"}[18m])`,
-			output:         []string{`{group="canary", instance="1", job="app-server"} => 288 @[%v]`},
-			fullRanges:     1,
-			intervalRanges: 0,
+			expr:   `delta(http_requests{group="canary", instance="1", job="app-server"}[18m])`,
+			output: []string{`{group="canary", instance="1", job="app-server"} => 288 @[%v]`},
 		}, {
 			// Deltas should perform the same operation when 2nd argument is 0.
-			expr:           `delta(http_requests{group="canary", instance="1", job="app-server"}[18m], 0)`,
-			output:         []string{`{group="canary", instance="1", job="app-server"} => 288 @[%v]`},
-			fullRanges:     1,
-			intervalRanges: 0,
+			expr:   `delta(http_requests{group="canary", instance="1", job="app-server"}[18m], 0)`,
+			output: []string{`{group="canary", instance="1", job="app-server"} => 288 @[%v]`},
 		}, {
 			// Rates should calculate per-second rates.
-			expr:           `rate(http_requests{group="canary", instance="1", job="app-server"}[60m])`,
-			output:         []string{`{group="canary", instance="1", job="app-server"} => 0.26666666666666666 @[%v]`},
-			fullRanges:     1,
-			intervalRanges: 0,
+			expr:   `rate(http_requests{group="canary", instance="1", job="app-server"}[60m])`,
+			output: []string{`{group="canary", instance="1", job="app-server"} => 0.26666666666666666 @[%v]`},
 		}, {
 			// Deriv should return the same as rate in simple cases.
-			expr:           `deriv(http_requests{group="canary", instance="1", job="app-server"}[60m])`,
-			output:         []string{`{group="canary", instance="1", job="app-server"} => 0.26666666666666666 @[%v]`},
-			fullRanges:     1,
-			intervalRanges: 0,
+			expr:   `deriv(http_requests{group="canary", instance="1", job="app-server"}[60m])`,
+			output: []string{`{group="canary", instance="1", job="app-server"} => 0.26666666666666666 @[%v]`},
 		}, {
 			// Counter resets at in the middle of range are handled correctly by rate().
-			expr:           `rate(testcounter_reset_middle[60m])`,
-			output:         []string{`{} => 0.03 @[%v]`},
-			fullRanges:     1,
-			intervalRanges: 0,
+			expr:   `rate(testcounter_reset_middle[60m])`,
+			output: []string{`{} => 0.03 @[%v]`},
 		}, {
 			// Counter resets at end of range are ignored by rate().
-			expr:           `rate(testcounter_reset_end[5m])`,
-			output:         []string{`{} => 0 @[%v]`},
-			fullRanges:     1,
-			intervalRanges: 0,
+			expr:   `rate(testcounter_reset_end[5m])`,
+			output: []string{`{} => 0 @[%v]`},
 		}, {
 			// Deriv should return correct result.
-			expr:           `deriv(testcounter_reset_middle[100m])`,
-			output:         []string{`{} => 0.010606060606060607 @[%v]`},
-			fullRanges:     1,
-			intervalRanges: 0,
+			expr:   `deriv(testcounter_reset_middle[100m])`,
+			output: []string{`{} => 0.010606060606060607 @[%v]`},
 		}, {
 			// count_scalar for a non-empty vector should return scalar element count.
-			expr:           `count_scalar(http_requests)`,
-			output:         []string{`scalar: 8 @[%v]`},
-			fullRanges:     0,
-			intervalRanges: 8,
+			expr:   `count_scalar(http_requests)`,
+			output: []string{`scalar: 8 @[%v]`},
 		}, {
 			// count_scalar for an empty vector should return scalar 0.
-			expr:           `count_scalar(nonexistent)`,
-			output:         []string{`scalar: 0 @[%v]`},
-			fullRanges:     0,
-			intervalRanges: 0,
+			expr:   `count_scalar(nonexistent)`,
+			output: []string{`scalar: 0 @[%v]`},
 		}, {
 			// Empty expressions shouldn't parse.
 			expr:       ``,
@ -454,8 +364,6 @@ func TestExpressions(t *testing.T) {
 				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
 				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 4,
 		}, {
 			expr: `http_requests{job=~"server",group!="canary"}`,
 			output: []string{
@ -464,29 +372,21 @@ func TestExpressions(t *testing.T) {
 				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
 				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 4,
 		}, {
 			expr: `http_requests{job!~"api",group!="canary"}`,
 			output: []string{
 				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
 				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		}, {
-			expr:           `count_scalar(http_requests{job=~"^server$"})`,
-			output:         []string{`scalar: 0 @[%v]`},
-			fullRanges:     0,
-			intervalRanges: 0,
+			expr:   `count_scalar(http_requests{job=~"^server$"})`,
+			output: []string{`scalar: 0 @[%v]`},
 		}, {
 			expr: `http_requests{group="production",job=~"^api"}`,
 			output: []string{
 				`http_requests{group="production", instance="0", job="api-server"} => 100 @[%v]`,
 				`http_requests{group="production", instance="1", job="api-server"} => 200 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{
 			expr: `abs(-1 * http_requests{group="production",job="api-server"})`,
@ -494,8 +394,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 100 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 200 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{
 			expr: `floor(0.004 * http_requests{group="production",job="api-server"})`,
@ -503,8 +401,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 0 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 0 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{
 			expr: `ceil(0.004 * http_requests{group="production",job="api-server"})`,
@ -512,8 +408,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 1 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 1 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{
 			expr: `round(0.004 * http_requests{group="production",job="api-server"})`,
@ -521,8 +415,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 0 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 1 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{ // Round should correctly handle negative numbers.
 			expr: `round(-1 * (0.004 * http_requests{group="production",job="api-server"}))`,
@ -530,8 +422,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 0 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => -1 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{ // Round should round half up.
 			expr: `round(0.005 * http_requests{group="production",job="api-server"})`,
@ -539,8 +429,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 1 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 1 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{
 			expr: `round(-1 * (0.005 * http_requests{group="production",job="api-server"}))`,
@ -548,8 +436,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 0 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => -1 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{
 			expr: `round(1 + 0.005 * http_requests{group="production",job="api-server"})`,
@ -557,8 +443,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 2 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 2 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{
 			expr: `round(-1 * (1 + 0.005 * http_requests{group="production",job="api-server"}))`,
@ -566,8 +450,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => -1 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => -2 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{ // Round should accept the number to round nearest to.
 			expr: `round(0.0005 * http_requests{group="production",job="api-server"}, 0.1)`,
@ -575,8 +457,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 0.1 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 0.1 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{
 			expr: `round(2.1 + 0.0005 * http_requests{group="production",job="api-server"}, 0.1)`,
@ -584,8 +464,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 2.2 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 2.2 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{
 			expr: `round(5.2 + 0.0005 * http_requests{group="production",job="api-server"}, 0.1)`,
@ -593,8 +471,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 5.3 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 5.3 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{ // Round should work correctly with negative numbers and multiple decimal places.
 			expr: `round(-1 * (5.2 + 0.0005 * http_requests{group="production",job="api-server"}), 0.1)`,
@ -602,8 +478,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => -5.2 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => -5.3 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{ // Round should work correctly with big toNearests.
 			expr: `round(0.025 * http_requests{group="production",job="api-server"}, 5)`,
@ -611,8 +485,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 5 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 5 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{
 			expr: `round(0.045 * http_requests{group="production",job="api-server"}, 5)`,
@ -620,8 +492,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 5 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 10 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{
 			expr: `avg_over_time(http_requests{group="production",job="api-server"}[1h])`,
@ -629,8 +499,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 50 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 100 @[%v]`,
 			},
-			fullRanges:     2,
-			intervalRanges: 0,
 		},
 		{
 			expr: `count_over_time(http_requests{group="production",job="api-server"}[1h])`,
@ -638,8 +506,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 11 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 11 @[%v]`,
 			},
-			fullRanges:     2,
-			intervalRanges: 0,
 		},
 		{
 			expr: `max_over_time(http_requests{group="production",job="api-server"}[1h])`,
@ -647,8 +513,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 100 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 200 @[%v]`,
 			},
-			fullRanges:     2,
-			intervalRanges: 0,
 		},
 		{
 			expr: `min_over_time(http_requests{group="production",job="api-server"}[1h])`,
@ -656,8 +520,6 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 0 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 0 @[%v]`,
 			},
-			fullRanges:     2,
-			intervalRanges: 0,
 		},
 		{
 			expr: `sum_over_time(http_requests{group="production",job="api-server"}[1h])`,
@ -665,14 +527,10 @@ func TestExpressions(t *testing.T) {
 				`{group="production", instance="0", job="api-server"} => 550 @[%v]`,
 				`{group="production", instance="1", job="api-server"} => 1100 @[%v]`,
 			},
-			fullRanges:     2,
-			intervalRanges: 0,
 		},
 		{
-			expr:           `time()`,
-			output:         []string{`scalar: 3000 @[%v]`},
-			fullRanges:     0,
-			intervalRanges: 0,
+			expr:   `time()`,
+			output: []string{`scalar: 3000 @[%v]`},
 		},
 		{
 			expr: `drop_common_labels(http_requests{group="production",job="api-server"})`,
@ -680,8 +538,6 @@ func TestExpressions(t *testing.T) {
 				`http_requests{instance="0"} => 100 @[%v]`,
 				`http_requests{instance="1"} => 200 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 2,
 		},
 		{
 			expr: `{` + string(clientmodel.MetricNameLabel) + `=~".*"}`,
@ -698,8 +554,6 @@ func TestExpressions(t *testing.T) {
 				`testcounter_reset_middle => 50 @[%v]`,
 				`x{y="testvalue"} => 100 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 11,
 		},
 		{
 			expr: `{job=~"server", job!~"api"}`,
@ -709,8 +563,6 @@ func TestExpressions(t *testing.T) {
 				`http_requests{group="production", instance="0", job="app-server"} => 500 @[%v]`,
 				`http_requests{group="production", instance="1", job="app-server"} => 600 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 4,
 		},
 		{
 			// Test alternative "by"-clause order.
@ -719,8 +571,6 @@ func TestExpressions(t *testing.T) {
 				`{group="canary"} => 700 @[%v]`,
 				`{group="production"} => 300 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 4,
 		},
 		{
 			// Test alternative "by"-clause order with "keeping_extra".
@ -729,8 +579,6 @@ func TestExpressions(t *testing.T) {
 				`{group="canary", job="api-server"} => 700 @[%v]`,
 				`{group="production", job="api-server"} => 300 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 4,
 		},
 		{
 			// Test both alternative "by"-clause orders in one expression.
@ -740,48 +588,58 @@ func TestExpressions(t *testing.T) {
 			output: []string{
 				`{job="api-server"} => 1000 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 4,
 		},
 		{
 			expr: `absent(nonexistent)`,
 			output: []string{
 				`{} => 1 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 0,
 		},
 		{
 			expr: `absent(nonexistent{job="testjob", instance="testinstance", method=~".*"})`,
 			output: []string{
 				`{instance="testinstance", job="testjob"} => 1 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 0,
 		},
 		{
 			expr: `count_scalar(absent(http_requests))`,
 			output: []string{
 				`scalar: 0 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		},
 		{
 			expr: `count_scalar(absent(sum(http_requests)))`,
 			output: []string{
 				`scalar: 0 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 8,
 		},
 		{
 			expr: `absent(sum(nonexistent{job="testjob", instance="testinstance"}))`,
 			output: []string{
 				`{} => 1 @[%v]`,
 			},
-			fullRanges:     0,
-			intervalRanges: 0,
+		},
+		{
+			expr: `http_requests{group="production",job="api-server"} offset 5m`,
+			output: []string{
+				`http_requests{group="production", instance="0", job="api-server"} => 90 @[%v]`,
+				`http_requests{group="production", instance="1", job="api-server"} => 180 @[%v]`,
+			},
+		},
+		{
+			expr: `rate(http_requests{group="production",job="api-server"}[10m] offset 5m)`,
+			output: []string{
+				`{group="production", instance="0", job="api-server"} => 0.03333333333333333 @[%v]`,
+				`{group="production", instance="1", job="api-server"} => 0.06666666666666667 @[%v]`,
+			},
+		},
+		{
+			expr:       `rate(http_requests[10m]) offset 5m`,
+			shouldFail: true,
+		},
+		{
+			expr:       `sum(http_requests) offset 5m`,
+			shouldFail: true,
 		},
 	}

@ -834,17 +692,6 @@ func TestExpressions(t *testing.T) {
 				}
 			}

-			analyzer := ast.NewQueryAnalyzer(storage)
-			ast.Walk(analyzer, testExpr)
-			if exprTest.fullRanges != len(analyzer.FullRanges) {
-				t.Errorf("%d. Count of full ranges didn't match: %v vs %v", i, exprTest.fullRanges, len(analyzer.FullRanges))
-				failed = true
-			}
-			if exprTest.intervalRanges != len(analyzer.IntervalRanges) {
-				t.Errorf("%d. Count of interval ranges didn't match: %v vs %v", i, exprTest.intervalRanges, len(analyzer.IntervalRanges))
-				failed = true
-			}
-
 			if failed {
 				t.Errorf("%d. Expression: %v\n%v", i, exprTest.expr, vectorComparisonString(expectedLines, resultLines))
 			}