grid

assira/src/main/java/net/ranides/assira/collection/Grid.java

@@ -17,6 +17,7 @@ import net.ranides.assira.reflection.BeanModel;
 import java.util.AbstractMap.SimpleImmutableEntry;
 import java.util.*;
 import java.util.function.Function;
+import java.util.stream.Collectors;
 import java.util.stream.IntStream;
 import java.util.stream.Stream;
 
@@ -58,11 +59,14 @@ public class Grid<T> {
     }
 
     public static <T> Grid<T> fromMap(List<? extends Map<String, T>> records) {
-        Set<String> headset = new LinkedHashSet<>();
-        records.stream().map(Map::keySet).forEach(headset::addAll);
-
-        List<String> head = new ArrayList<>(headset);
-        List<List<T>> data = records.stream().map(r -> head.stream().map((String key) -> r.get(key)).collect(toList())).collect(toList());
+        List<String> head = records.stream()
+            .flatMap(map -> map.keySet().stream())
+            .distinct()
+            .collect(Collectors.toList());
+
+        List<List<T>> data = records.stream()
+            .map(r -> head.stream().map(r::get).collect(toList()))
+            .collect(toList());
 
         return new Grid<>(head, data);
     }