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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