fix: Support names with no qualifier

src/mutation.ts

@@ -381,7 +381,15 @@ export class Mutation {
    */
   static parseColumnName(columnName: string): ParsedColumn {
     const colonIdx = columnName.indexOf(':');
-
+
+    if (colonIdx == -1) {
+      // columnName does not contain ':'
+      return {
+        family: columnName,
+        qualifier: undefined,
+      };
+    }
+
     return {
       family: columnName.slice(0, colonIdx),
       qualifier: columnName.slice(colonIdx + 1),