chore: make test data closer

Author: mesejo

ibis/backends/tests/test_aggregation.py

@@ -687,12 +687,17 @@ def test_first_last_ordered(alltypes, method, filtered, include_null):
 )
 def test_first_last_ordered_in_mutate(alltypes, con, method, expected):
     # originally reported in https://github.com/ibis-project/ibis/issues/11656
-    t = alltypes.select(
-        a=ibis._.tinyint_col, val=ibis._.int_col, ob=ibis._.bigint_col
-    ).filter(ibis._.val.isin((4, 5)))
+    t = (
+        alltypes.select(a=ibis._.tinyint_col, val=ibis._.int_col, ob=ibis._.bigint_col)
+        .filter(
+            ((ibis._.val == 4) & (ibis._.ob == 40))
+            | ((ibis._.val == 5) & (ibis._.ob == 50))
+        )
+        .limit(10)
+    )
     expr = t.mutate(new=method(t.val))
     actual = con.to_pyarrow(expr.new).to_pylist()
-    assert actual == [expected] * len(actual)
+    assert actual == [expected] * 10
 
 
 @pytest.mark.notimpl(