From 5727b8ce591cc5d63e080eb92476da346f2507a3 Mon Sep 17 00:00:00 2001
From: zhouhui <vsop_479@163.com>
Date: Tue, 15 Oct 2024 22:12:48 +0800
Subject: [PATCH] Optimize convert byte2int. (#13889)

---
 lucene/core/src/java/org/apache/lucene/util/fst/Util.java | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lucene/core/src/java/org/apache/lucene/util/fst/Util.java b/lucene/core/src/java/org/apache/lucene/util/fst/Util.java
index a6df78eaab5..c0f4bfeb572 100644
--- a/lucene/core/src/java/org/apache/lucene/util/fst/Util.java
+++ b/lucene/core/src/java/org/apache/lucene/util/fst/Util.java
@@ -775,10 +775,11 @@ public final class Util {
 
   /** Just takes unsigned byte values from the BytesRef and converts into an IntsRef. */
   public static IntsRef toIntsRef(BytesRef input, IntsRefBuilder scratch) {
-    scratch.clear();
+    scratch.growNoCopy(input.length);
     for (int i = 0; i < input.length; i++) {
-      scratch.append(input.bytes[i + input.offset] & 0xFF);
+      scratch.setIntAt(i, input.bytes[i + input.offset] & 0xFF);
     }
+    scratch.setLength(input.length);
     return scratch.get();
   }