/// Normalize the provided keys argument to a projection. I.e. if the
/// argument is `None`, this corresponds to any set containing the empty
/// string.
Normalize the provided keys argument to a projection.
Normalize the provided keys argument to a projection .
fn keys_to_projection(keys: Option<String>) -> Vec<String> {
        Self::shortest_prefix_free_set(
            keys.map(|s| s.split(',').map(|s| s.into()).collect::<Vec<_>>())
                .unwrap_or_else(universal_projection),
        )
    }
fn keys_to_projection ( keys : Option < String > ) -> Vec < String > { Self :: shortest_prefix_free_set ( keys . map ( | s | s . split ( ',' ) . map ( | s | s . into ( ) ) . collect :: < Vec < _ > > ( ) ) . unwrap_or_else ( universal_projection ) , ) }
Normalize the provided keys argument to a projection.
Normalize the provided keys argument to a projection .
keys
Option<String>