Stream table new columns

shared/src/utils/string_utils.rs

@@ -127,6 +127,16 @@ pub fn humanize_snake_case(s: &str) -> String {
     result
 }
 
+pub trait StringExt {
+    fn longest<'a>(a: &'a str, b: &'a str) -> &'a str;
+}
+
+impl StringExt for String {
+    fn longest<'a>(a: &'a str, b: &'a str) -> &'a str {
+        if a.len() >= b.len() { a } else { b }
+    }
+}
+
 #[cfg(test)]
 mod test {
     use std::collections::HashSet;