Fixes the Stringer of the byte label operator. (#2946)

This would cause the operator to become a numeric one once stringified.

Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>

pkg/logql/ast_test.go

@@ -27,6 +27,7 @@ func Test_logSelectorExpr_String(t *testing.T) {
 		{`{foo="bar", bar!="baz"} |~ "" |= "" |~ ".*"`, false},
 		{`{foo="bar", bar!="baz"} != "bip" !~ ".+bop" | json`, true},
 		{`{foo="bar"} |= "baz" |~ "blip" != "flip" !~ "flap" | logfmt`, true},
+		{`{foo="bar"} |= "baz" |~ "blip" != "flip" !~ "flap" | logfmt | b>=10GB`, true},
 		{`{foo="bar"} |= "baz" |~ "blip" != "flip" !~ "flap" | regexp "(?P<foo>foo|bar)"`, true},
 		{`{foo="bar"} |= "baz" |~ "blip" != "flip" !~ "flap" | regexp "(?P<foo>foo|bar)" | ( ( foo<5.01 , bar>20ms ) or foo="bar" ) | line_format "blip{{.boop}}bap" | label_format foo=bar,bar="blip{{.blop}}"`, true},
 	}

pkg/logql/log/label_filter.go

@@ -5,6 +5,7 @@ import (
 	"strconv"
 	"strings"
 	"time"
+	"unicode"
 
 	"github.com/dustin/go-humanize"
 	"github.com/prometheus/prometheus/pkg/labels"
@@ -179,7 +180,13 @@ func (d *BytesLabelFilter) Process(line []byte, lbs *LabelsBuilder) ([]byte, boo
 }
 
 func (d *BytesLabelFilter) String() string {
-	return fmt.Sprintf("%s%s%d", d.Name, d.Type, d.Value)
+	b := strings.Map(func(r rune) rune {
+		if unicode.IsSpace(r) {
+			return -1
+		}
+		return r
+	}, humanize.Bytes(d.Value))
+	return fmt.Sprintf("%s%s%s", d.Name, d.Type, b)
 }
 
 type DurationLabelFilter struct {