[GitHub] [ignite-3] ygerzhedovich commented on a change in pull request #435: IGNITE-14484 Implement RecordView API.

[GitBox <gi...@apache.org>]

ygerzhedovich commented on a change in pull request #435:
URL: https://github.com/apache/ignite-3/pull/435#discussion_r748153418



##########
File path: modules/api/src/main/java/org/apache/ignite/table/mapper/MapperBuilder.java
##########
@@ -102,11 +105,24 @@
      * Builds mapper.
      *
      * @return Mapper.
+     * @throws IllegalStateException if nothing were mapped or more than one column were mapped to the same field.
      */
     public Mapper<T> build() {
-        Map<String, String> mapping = this.mapping;
+        if (columnToFields.isEmpty()) {
+            throw new IllegalStateException("Empty mapping doen't allowed.");

Review comment:
       ```suggestion
               throw new IllegalStateException("Empty mapping doesn't allowed.");
   ```




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