Enum SplitResults 

pub enum SplitResults {
    Some(BuiltDataFrame),
    None(Preserved),
}

Result partition for DataFrameShape::Split.

Used to distinguish “no Ok rows at all” (which lets the caller supply a sentinel value such as NULL, NA, FALSE, …) from a real zero-row data.frame.

Variants

Some(BuiltDataFrame)

At least one Ok row — partition has a concrete data.frame.

None(Preserved)

No Ok rows — sentinel value supplied by the caller via empty_ok_sentinel, GC-rooted by its Preserved handle. The sentinel is an arbitrary R value (NULL, NA, FALSE, a zero-row data.frame, …), so it cannot ride in a BuiltDataFrame.

The handle is consumed by the IntoR impl on DataFrameShape; until then its own root keeps the sentinel reachable (#1265) — no immediate-conversion contract for this leg.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 24 bytes

Size for each variant:

• Some: 16 bytes
• None: 8 bytes