修复selectObjs泛型错误问题

mybatis-plus-extension/src/main/java/com/baomidou/mybatisplus/extension/service/impl/ServiceImpl.java

@@ -20,6 +20,7 @@ import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.function.Function;
 import java.util.stream.Collectors;
 
 import org.apache.ibatis.binding.MapperMethod;
@@ -302,8 +303,8 @@ public class ServiceImpl<M extends BaseMapper<T>, T> implements IService<T> {
     }
 
     @Override
-    public List<Object> listObjs(Wrapper<T> queryWrapper) {
-        return baseMapper.selectObjs(queryWrapper).stream().filter(Objects::nonNull).collect(Collectors.toList());
+    public <V> List<V> listObjs(Wrapper<T> queryWrapper, Function<? super Object, V> mapper) {
+        return baseMapper.selectObjs(queryWrapper).stream().filter(Objects::nonNull).map(mapper).collect(Collectors.toList());
     }
 
     @Override