From ff47c7eb6e8335ef6042e3a437f3d30ef27600a7 Mon Sep 17 00:00:00 2001
From: John Darrington <john@darrington.wattle.id.au>
Date: Sat, 25 Sep 2021 18:59:52 +0200
Subject: [PATCH] Fix possible incorrect assertion when creating unique
 casereaders.

* src/data/casereader-translator.c (uniquify): Force dir to be an element of  {0, 1, -1}
---
 src/data/casereader-translator.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/data/casereader-translator.c b/src/data/casereader-translator.c
index a6508502b7..3567f5c3a5 100644
--- a/src/data/casereader-translator.c
+++ b/src/data/casereader-translator.c
@@ -502,6 +502,11 @@ uniquify (const struct ccase *c, void *aux)
 
   dir = value_compare_3way (case_data (next_case, cdr->key),
 			    current_value, key_width);
+  if (dir > 0)
+    dir = 1;
+  if (dir < 0)
+    dir = -1;
+      
   case_unref (next_case);
   if (dir != 0)
     {
-- 
2.30.2