Trait ChunkUnique 

pub trait ChunkUnique {
    // Required methods
    fn unique(&self) -> PolarsResult<Self>
       where Self: Sized;
    fn arg_unique(&self) -> PolarsResult<IdxCa>;
    fn unique_id(&self) -> PolarsResult<(IdxSize, Vec<IdxSize>)>;

    // Provided method
    fn n_unique(&self) -> PolarsResult<usize> { ... }
}

Get unique values in a ChunkedArray

Required Methods

fn unique(&self) -> PolarsResult<Self>

where Self: Sized,

Get unique values of a ChunkedArray

fn arg_unique(&self) -> PolarsResult<IdxCa>

Get first index of the unique values in a ChunkedArray. This Vec is sorted.

fn unique_id(&self) -> PolarsResult<(IdxSize, Vec<IdxSize>)>

Get dense ids for each unique value.

Returns: (n_unique, unique_ids)

Provided Methods

fn n_unique(&self) -> PolarsResult<usize>

Number of unique values in the ChunkedArray

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl ChunkUnique for BinaryChunked

Available on crate feature algorithm_group_by only.

impl ChunkUnique for BinaryOffsetChunked

Available on crate feature algorithm_group_by only.

impl ChunkUnique for BooleanChunked

Available on crate feature algorithm_group_by only.

impl ChunkUnique for StringChunked

Available on crate feature algorithm_group_by only.

impl<T: PolarsObject> ChunkUnique for ObjectChunked<T>

Available on crate features algorithm_group_by and object only.

impl<T> ChunkUnique for ChunkedArray<T>

where T: PolarsNumericType, T::Native: TotalHash + TotalEq + ToTotalOrd, <T::Native as ToTotalOrd>::TotalOrdItem: Hash + Eq + Ord, ChunkedArray<T>: for<'a> ChunkCompareEq<&'a ChunkedArray<T>, Item = BooleanChunked>,

Available on crate feature algorithm_group_by only.