fix

Author: Alibaba-HZY

fluss-common/src/main/java/com/alibaba/fluss/types/RowType.java

@@ -265,14 +265,4 @@ public RowType build() {
             return new RowType(isNullable, fields);
         }
     }
-
-    public DataField getField(String fieldName) {
-        for (DataField field : fields) {
-            if (field.getName().equals(fieldName)) {
-                return field;
-            }
-        }
-
-        throw new RuntimeException("Cannot find field: " + fieldName);
-    }
 }