fix: allow comparison against zero bytes (#15217)

Co-authored-by: George Robinson <george.robinson@grafana.com>

Author: trevorwhitney

pkg/logql/log/metrics_extraction_test.go

@@ -162,6 +162,22 @@ func Test_labelSampleExtractor_Extract(t *testing.T) {
 			),
 			wantOk: true,
 		},
+		{
+			name: "convert bytes without spaces",
+			ex: mustSampleExtractor(LabelExtractorWithStages(
+				"foo", ConvertBytes, []string{"bar", "buzz"}, false, false, nil, NoopStage,
+			)),
+			in: labels.FromStrings("foo", "13MiB",
+				"bar", "foo",
+				"buzz", "blip",
+				"namespace", "dev",
+			),
+			want: 13 * 1024 * 1024,
+			wantLbs: labels.FromStrings("bar", "foo",
+				"buzz", "blip",
+			),
+			wantOk: true,
+		},
 		{
 			name: "convert bytes with structured metadata",
 			ex: mustSampleExtractor(LabelExtractorWithStages(

pkg/logql/syntax/lex_test.go

@@ -108,6 +108,10 @@ func TestLex(t *testing.T) {
 		{`34+-123`, []int{NUMBER, ADD, SUB, NUMBER}},
 		{`34-123`, []int{NUMBER, SUB, NUMBER}},
 		{`sum(rate({foo="bar"}[5m])-1 > 30`, []int{SUM, OPEN_PARENTHESIS, RATE, OPEN_PARENTHESIS, OPEN_BRACE, IDENTIFIER, EQ, STRING, CLOSE_BRACE, RANGE, CLOSE_PARENTHESIS, SUB, NUMBER, GT, NUMBER}},
+		{`{foo="bar"} | logfmt | bytes  < 0B`, []int{OPEN_BRACE, IDENTIFIER, EQ, STRING, CLOSE_BRACE, PIPE, LOGFMT, PIPE, IDENTIFIER, LT, BYTES}},
+		{`{foo="bar"} | logfmt | bytes  < 1B`, []int{OPEN_BRACE, IDENTIFIER, EQ, STRING, CLOSE_BRACE, PIPE, LOGFMT, PIPE, IDENTIFIER, LT, BYTES}},
+		{`0b01`, []int{NUMBER}},
+		{`0b10`, []int{NUMBER}},
 	} {
 		t.Run(tc.input, func(t *testing.T) {
 			actual := []int{}

pkg/logql/syntax/query_scanner.go

@@ -409,8 +409,10 @@ func (s *Scanner) scanNumber(ch rune, seenDot bool) (rune, rune) {
 				ch = s.next()
 				base, prefix = 8, 'o'
 			case 'b':
-				ch = s.next()
-				base, prefix = 2, 'b'
+				if peek := s.Peek(); peek == '0' || peek == '1' {
+					ch = s.next()
+					base, prefix = 2, 'b'
+				}
 			default:
 				base, prefix = 8, '0'
 				digsep = 1 // leading 0