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fix(python): translate Polars is_null expressions #10189

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Merged
robert3005 merged 1 commit into from
Oct 8, 2026
Merged

fix(python): translate Polars is_null expressions #10189

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3 changes: 3 additions & 0 deletions vortex-python/python/vortex/polars_.py
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Original file line number Diff line number Diff line change
Expand Up @@ -172,6 +172,9 @@ def _polars_to_vortex(expr: dict[str, Any]) -> ve.Expr:
if fn == "IsNotNull":
return ve.is_not_null(_inputs[0])

if fn == "IsNull":
return ve.is_null(_inputs[0])

if "IsIn" in fn:
fn = fn["IsIn"]
if fn["nulls_equal"]:
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11 changes: 11 additions & 0 deletions vortex-python/test/test_polars_.py
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Expand Up @@ -182,3 +182,14 @@ def test_polars_binary_literals(tmp_path):
actual = vx.open(str(path)).to_polars().filter(expr).collect()
assert_frame_equal(actual, expected_frame)
assert actual["id"].to_list() == [0]


def test_polars_is_null(tmp_path):
frame = pl.DataFrame({"id": [0, 1, 2], "x": [1, None, 3]})
expr = pl.col("x").is_null()
path = tmp_path / "is_null.vortex"
vx.io.write(vx.array(frame.to_arrow()), str(path))
expected_frame = frame.lazy().filter(expr).collect()
actual = vx.open(str(path)).to_polars().filter(expr).collect()
assert_frame_equal(actual, expected_frame)
assert actual["id"].to_list() == [1]
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