Module shape 

DataFrameShape: the owned, GC-rooted return shape of the data.frame split verbs.

Two producers share it:

• rows.into_dataframe_split() (IntoDataFrameSplit, from #[derive(DataFrameRow)] on an enum) — always Bare or PerVariantList;
• the serde helpers vec_to_dataframe_split / result_to_dataframe (feature = "serde") — every variant.

The type lives here rather than under serde because the derive split is not serde-gated.

Enums

DataFrameShape

Categorical return shape of the data.frame split verbs: IntoDataFrameSplit::into_dataframe_split and the serde helpers vec_to_dataframe_split / result_to_dataframe (feature = "serde").

SplitResults

Result partition for DataFrameShape::Split.