From 63c9caaf96560a6952d37686c345de1d3ba143b2 Mon Sep 17 00:00:00 2001
From: LSmyrnaios <lsmyrnaios@gmail.com>
Date: Wed, 14 Dec 2022 17:12:27 +0200
Subject: [PATCH] Improve performance of
 "AggregationServiceImpl.createYearMap()".

---
 .../dnetlib/repo/manager/service/AggregationServiceImpl.java | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/main/java/eu/dnetlib/repo/manager/service/AggregationServiceImpl.java b/src/main/java/eu/dnetlib/repo/manager/service/AggregationServiceImpl.java
index d79e758..2325738 100644
--- a/src/main/java/eu/dnetlib/repo/manager/service/AggregationServiceImpl.java
+++ b/src/main/java/eu/dnetlib/repo/manager/service/AggregationServiceImpl.java
@@ -81,11 +81,8 @@ public class AggregationServiceImpl implements AggregationService {
 
     private Map<String, List<AggregationInfo>> createYearMap(List<AggregationInfo> aggregationHistory) {
 
-        aggregationHistory = aggregationHistory.stream()
-                .sorted(Comparator.comparing(AggregationInfo::getDate).reversed())
-                .collect(Collectors.toList());
-
         return aggregationHistory.stream()
+                .sorted(Comparator.comparing(AggregationInfo::getDate).reversed())
                 .collect(Collectors.groupingBy(item -> getYear(item.getDate())));
     }