1 files changed, 4 insertions, 0 deletions
diff --git a/dataset/string.go b/dataset/string.go
index c1f7600..76f047b 100644
--- a/dataset/string.go
+++ b/dataset/string.go
@@ -20,6 +20,10 @@ func (s *StringReader) Texts() iter.Seq2[int, string] {
 	}
 }
 
+func (s *StringReader) Num() (int, error) {
+	return 1, nil
+}
+
 func (s *StringReader) Err() error {
 	return nil
 }