From bf51a9faf9942571cf1eea64ae260a9ced5c4598 Mon Sep 17 00:00:00 2001
From: Beluga Behr <dam6923@gmail.com>
Date: Sun, 30 Dec 2018 20:34:13 -0500
Subject: [PATCH] THRIFT-4695: Pre-Size Java Collections in Union

---
 lib/java/src/org/apache/thrift/TUnion.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/java/src/org/apache/thrift/TUnion.java b/lib/java/src/org/apache/thrift/TUnion.java
index 13f9c6774..1ef11df49 100644
--- a/lib/java/src/org/apache/thrift/TUnion.java
+++ b/lib/java/src/org/apache/thrift/TUnion.java
@@ -79,7 +79,7 @@ public abstract class TUnion<T extends TUnion<T,F>, F extends TFieldIdEnum> impl
   }
 
   private static Map deepCopyMap(Map<Object, Object> map) {
-    Map copy = new HashMap();
+    Map copy = new HashMap(map.size());
     for (Map.Entry<Object, Object> entry : map.entrySet()) {
       copy.put(deepCopyObject(entry.getKey()), deepCopyObject(entry.getValue()));
     }
@@ -87,7 +87,7 @@ public abstract class TUnion<T extends TUnion<T,F>, F extends TFieldIdEnum> impl
   }
 
   private static Set deepCopySet(Set set) {
-    Set copy = new HashSet();
+    Set copy = new HashSet(set.size());
     for (Object o : set) {
       copy.add(deepCopyObject(o));
     }