Enum MaybeView 

pub enum MaybeView<'v> {
    View(ArrayView2<'v, DataValue>),
    Array(Array2<DataValue>),
}

Either a borrowed ArrayView2 or an owned Array2 of DataValue.

Returned by ColumnFrame::select_view to avoid unnecessary copies when all columns are requested (the owned variant) while still supporting zero-copy views for single-column and subset selections.

Call row_view to obtain a unified read-only ArrayView2 regardless of which variant is held.

Variants

View(ArrayView2<'v, DataValue>)

A borrowed view into the underlying storage.

Array(Array2<DataValue>)

An owned array (produced when data must be re-shaped or stacked).

Implementations

impl MaybeView<'_>

pub fn row_view(&self) -> ArrayView2<'_, DataValue>

Returns a read-only 2-D view over the data in row-major order.

For the Array variant the underlying storage is transposed so that the resulting view always has shape (nrows, ncols).