Merge pull request #17354 from prometheus/fix-smoothed-anchored-formatting

Fix formatting of range vector selectors with smoothed/anchored modifier

promql/parser/printer.go

@@ -229,7 +229,6 @@ func (node *Call) ShortString() string {
 }
 
 func (node *MatrixSelector) atOffset() (string, string) {
-	// Copy the Vector selector before changing the offset
 	vecSelector := node.VectorSelector.(*VectorSelector)
 	offset := ""
 	switch {
@@ -254,20 +253,21 @@ func (node *MatrixSelector) atOffset() (string, string) {
 
 func (node *MatrixSelector) String() string {
 	at, offset := node.atOffset()
-	// Copy the Vector selector before changing the offset
+	// Copy the Vector selector so we can modify it to not print @, offset, and other modifiers twice.
 	vecSelector := *node.VectorSelector.(*VectorSelector)
-	// Do not print the @ and offset twice.
+	anchored, smoothed := vecSelector.Anchored, vecSelector.Smoothed
-	offsetVal, offsetExprVal, atVal, preproc := vecSelector.OriginalOffset, vecSelector.OriginalOffsetExpr, vecSelector.Timestamp, vecSelector.StartOrEnd
 	vecSelector.OriginalOffset = 0
 	vecSelector.OriginalOffsetExpr = nil
 	vecSelector.Timestamp = nil
 	vecSelector.StartOrEnd = 0
+	vecSelector.Anchored = false
+	vecSelector.Smoothed = false
 
 	extendedAttribute := ""
 	switch {
-	case vecSelector.Anchored:
+	case anchored:
 		extendedAttribute = " anchored"
-	case vecSelector.Smoothed:
+	case smoothed:
 		extendedAttribute = " smoothed"
 	}
 	rangeStr := model.Duration(node.Range).String()
@@ -276,8 +276,6 @@ func (node *MatrixSelector) String() string {
 	}
 	str := fmt.Sprintf("%s[%s]%s%s%s", vecSelector.String(), rangeStr, extendedAttribute, at, offset)
 
-	vecSelector.OriginalOffset, vecSelector.OriginalOffsetExpr, vecSelector.Timestamp, vecSelector.StartOrEnd = offsetVal, offsetExprVal, atVal, preproc
-
 	return str
 }
 

promql/parser/printer_test.go

@@ -115,6 +115,36 @@ func TestExprString(t *testing.T) {
 		{
 			in: `a[1h:5m] offset 1m`,
 		},
+		{
+			in: `a anchored`,
+		},
+		{
+			in: `a[5m] anchored`,
+		},
+		{
+			in: `a{b="c"}[5m] anchored`,
+		},
+		{
+			in: `a{b="c"}[5m] anchored offset 1m`,
+		},
+		{
+			in: `a{b="c"}[5m] anchored @ start() offset 1m`,
+		},
+		{
+			in: `a smoothed`,
+		},
+		{
+			in: `a[5m] smoothed`,
+		},
+		{
+			in: `a{b="c"}[5m] smoothed`,
+		},
+		{
+			in: `a{b="c"}[5m] smoothed offset 1m`,
+		},
+		{
+			in: `a{b="c"}[5m] smoothed @ start() offset 1m`,
+		},
 		{
 			in: `{__name__="a"}`,
 		},
@@ -222,6 +252,11 @@ func TestExprString(t *testing.T) {
 		},
 	}
 
+	EnableExtendedRangeSelectors = true
+	t.Cleanup(func() {
+		EnableExtendedRangeSelectors = false
+	})
+
 	for _, test := range inputs {
 		t.Run(test.in, func(t *testing.T) {
 			expr, err := ParseExpr(test.in)