polars.Expr.list.set_intersection#

Expr.list.set_intersection(other: IntoExpr) → Expr[source]#

Compute the SET INTERSECTION between the elements in this list and the elements of other.

Parameters:

other: Right hand side of the set operation.

Examples

>>> df = pl.DataFrame(
...     {
...         "a": [[1, 2, 3], [], [None, 3], [5, 6, 7]],
...         "b": [[2, 3, 4], [3], [3, 4, None], [6, 8]],
...     }
... )
>>> df.with_columns(intersection=pl.col("a").list.set_intersection("b"))
shape: (4, 3)
┌───────────┬──────────────┬──────────────┐
│ a         ┆ b            ┆ intersection │
│ ---       ┆ ---          ┆ ---          │
│ list[i64] ┆ list[i64]    ┆ list[i64]    │
╞═══════════╪══════════════╪══════════════╡
│ [1, 2, 3] ┆ [2, 3, 4]    ┆ [2, 3]       │
│ []        ┆ [3]          ┆ []           │
│ [null, 3] ┆ [3, 4, null] ┆ [null, 3]    │
│ [5, 6, 7] ┆ [6, 8]       ┆ [6]          │
└───────────┴──────────────┴──────────────┘