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pola-rs · Jan 31, 2025 · b3607b3 · b3607b3
1 parent 316a7b6
commit b3607b3
Showing 1 changed file with 16 additions and 0 deletions.
diff --git a/py-polars/tests/unit/operations/test_cast.py b/py-polars/tests/unit/operations/test_cast.py
@@ -698,3 +698,19 @@ def test_cast_python_dtypes() -> None:
     assert s.cast(float).dtype == pl.Float64
     assert s.cast(bool).dtype == pl.Boolean
     assert s.cast(str).dtype == pl.String
+
+
+def test_overflowing_cast_literals_21023() -> None:
+    for optimized in [True, False]:
+        assert_frame_equal(
+            (
+                pl.LazyFrame()
+                .select(
+                    pl.lit(pl.Series([128], dtype=pl.Int64)).cast(
+                        pl.Int8, wrap_numerical=True
+                    )
+                )
+                .collect(optimized=optimized)
+            ),
+            pl.Series([-128], dtype=pl.Int8).to_frame(),
+        )