return null instead of 'null' in getString()

haifengl · Nov 22, 2019 · 2e1c56e · 2e1c56e
1 parent c516809
commit 2e1c56e
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/data/src/main/java/smile/data/Tuple.java b/data/src/main/java/smile/data/Tuple.java
@@ -268,7 +268,8 @@ default double getDouble(String field) {
      * @throws ClassCastException when data type does not match.
      */
     default String getString(int i) {
-        return schema().field(i).toString(get(i));
+        Object obj = get(i);
+        return obj == null ? null : schema().field(i).toString(obj);
     }
 
     /**
@@ -277,8 +278,7 @@ default String getString(int i) {
      * @throws ClassCastException when data type does not match.
      */
     default String getString(String field) {
-        int i = fieldIndex(field);
-        return schema().field(i).toString(get(i));
+        return getString(fieldIndex(field));
     }
 
     /**