From 4e16b2cc5a269a05635b41753d17d19045bf00cb Mon Sep 17 00:00:00 2001
From: Jad Dayoub <jad.taim2003@gmail.com>
Date: Fri, 24 Jul 2026 11:07:21 +0200
Subject: [PATCH] [ntuple] Fix decodeZigzag64 for SplitInt64 columns

---
 modules/rntuple.mjs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/modules/rntuple.mjs b/modules/rntuple.mjs
index abe753d80..a35c5d0f1 100644
--- a/modules/rntuple.mjs
+++ b/modules/rntuple.mjs
@@ -234,9 +234,9 @@ function decodeZigzag32(view) {
  * @private */
 function decodeZigzag64(view) {
    for (let o = 0; o < view.byteLength; o += 8) {
-      const x = view.getUint64(o, LITTLE_ENDIAN);
-      view.setInt64(o, (x >>> 1) ^ (-(x & 1)), LITTLE_ENDIAN);
-   }
+        const x = view.getBigUint64(o, LITTLE_ENDIAN);
+        view.setBigInt64(o, (x >> 1n) ^ (-(x & 1n)), LITTLE_ENDIAN);
+    }
 }