diff -r 27583efef74d -r e3a267a93711 mercurial/revlogutils/debug.py
--- a/mercurial/revlogutils/debug.py	Wed Jun 01 01:34:43 2022 +0200
+++ b/mercurial/revlogutils/debug.py	Wed Jun 01 01:34:21 2022 +0200
@@ -151,6 +151,11 @@
         return b"%d" % compression
 
 
+@debug_column(b"sidedata-offset", size=20, verbose=True)
+def sidedata_offset(index, rev, entry, hexfn):
+    return b"%d" % entry[constants.ENTRY_SIDEDATA_OFFSET]
+
+
 def debug_index(
     ui,
     repo,