Trait ColumnSelection 

pub trait ColumnSelection {
    type View;
    type ColumnView;
    type ColumnOwned;

    // Required methods
    fn c<S>(&self, selection: S) -> Self::View
       where S: FieldSelector;
    fn get(&self, field: &str) -> Option<Self::ColumnOwned>;
    fn col_ix(&self, idx: usize) -> Option<Self::ColumnView>;
    fn col_vec(&self) -> Vec<Self::ColumnView>;
    fn get_cols(&self) -> Vec<Arc<Field>>;

    // Provided method
    fn col(&self, name: &str) -> Self::View { ... }
}

Trait for types that support field/column selection

Associated types determine what each access pattern returns:

• View: multi-field selection result, e.g. TableV for Table, Cube for Cube
• DataView: single column by index, e.g. ArrayV
• Field: single field by name via .get(), e.g. FieldArray for Table, Arc for Cube

  Required Associated Types

  type View

  The view type returned by multi-field selection e.g. TableV

  type ColumnView

  A single column view by index e.g. ArrayV

  type ColumnOwned

  An owned single field by name via .get() e.g. FieldArray for Table, Arc

  for Cube

  Required Methods

  fn c<S>(&self, selection: S) -> Self::View

  where S: FieldSelector,

  Select fields/columns by name, index, or range

  Examples

  table.c(“age”) // single column by name table.c(&[“a”, “b”]) // multiple columns by name table.c(0) // single column by index table.c(0..3) // columns by range

  fn get(&self, field: &str) -> Option<Self::ColumnOwned>

  Get a single field by name, returning an owned value.

  fn col_ix(&self, idx: usize) -> Option<Self::ColumnView>

  Get a single column view by index

  fn col_vec(&self) -> Vec<Self::ColumnView>

  Get all columns as views

  fn get_cols(&self) -> Vec<Arc<Field>>

  Get the fields for field resolution

  Provided Methods

  fn col(&self, name: &str) -> Self::View

  Alias for c - select column by name

  Dyn Compatibility

  This trait is not dyn compatible.

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

  Implementors

  impl ColumnSelection for Table

  Available on crate features select and views only.

  type View = TableV

  type ColumnView = ArrayV

  type ColumnOwned = FieldArray

  impl ColumnSelection for TableV

  Available on crate feature select only.

  type View = TableV

  type ColumnView = ArrayV

  type ColumnOwned = FieldArray