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test(python): Add test for select(len()) #20343

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Dec 18, 2024
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test(python): Add test for select(len()) #20343

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12 changes: 12 additions & 0 deletions py-polars/tests/unit/test_projections.py
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Original file line number Diff line number Diff line change
Expand Up @@ -619,3 +619,15 @@ def test_with_columns_projection_pushdown() -> None:
def test_projection_pushdown_height_20221() -> None:
q = pl.LazyFrame({"a": range(5)}).select("a", b=pl.col("a").first()).select("b")
assert_frame_equal(q.collect(), pl.DataFrame({"b": [0, 0, 0, 0, 0]}))


def test_select_len_20337() -> None:
strs = [str(i) for i in range(3)]
q = pl.LazyFrame({"a": strs, "b": strs, "c": strs, "d": range(3)})

q = q.group_by(pl.col("c")).agg(
(pl.col("d") * j).alias(f"mult {j}") for j in [1, 2]
)

q = q.with_row_index("foo")
assert q.select(pl.len()).collect().item() == 3
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