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fix: Fix ColumnNotFound error selecting len() after semi/anti join #21355

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merged 1 commit into from
Feb 20, 2025
Merged

fix: Fix ColumnNotFound error selecting len() after semi/anti join #21355

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2 changes: 1 addition & 1 deletion crates/polars-plan/src/plans/optimizer/projection_pushdown/semi_anti_join.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ pub(super) fn process_semi_anti_join(
let mut names_left = PlHashSet::with_capacity(n);
let mut names_right = PlHashSet::with_capacity(n);

if ctx.acc_projections.is_empty() {
if !ctx.has_pushed_down() {
// Only project the join columns.
for e in &right_on {
add_expr_to_accumulated(e.node(), &mut pushdown_right, &mut names_right, expr_arena);
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9 changes: 9 additions & 0 deletions py-polars/tests/unit/operations/test_join.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1800,3 +1800,12 @@ def time_func(func: Callable[[], Any]) -> float:
if runtime_ratio > threshold:
msg = f"runtime_ratio ({runtime_ratio}) > {threshold}x ({runtime_eager = }, {runtime_lazy = })"
raise ValueError(msg)


def test_select_len_after_semi_anti_join_21343() -> None:
lhs = pl.LazyFrame({"a": [1, 2, 3], "b": [4, 5, 6]})
rhs = pl.LazyFrame({"a": [1, 2, 3]})

q = lhs.join(rhs, on="a", how="anti").select(pl.len())

assert q.collect().item() == 0
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