Revert "[Benchmark] Adapt data generation of integer columns."

This reverts commit 82788c4.

Author: ImmanuelHaffner

benchmark/operators/gen.py

@@ -142,7 +142,21 @@ def gen_random_int_values(smallest :int, largest :int, num :int):
     if largest - smallest == num:
         return list(range(smallest, largest))
 
-    return random.sample(range(smallest, largest), k=num)
+    taken = set()
+    counter = largest - num
+    values = list()
+
+    for i in range(0, num):
+        val = random.randrange(smallest, largest - num)
+        if val in taken:
+            values.append(counter)
+            counter += 1
+        else:
+            taken.add(val)
+            values.append(val)
+
+    assert len(values) == len(set(values))
+    return values
 
 
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