Enum RowSelectionCursor 

pub enum RowSelectionCursor {
    All,
    Mask(MaskCursor),
    Selectors(SelectorsCursor),
}

Cursor for iterating a RowSelection during execution within a ReadPlan.

This keeps per-reader state such as the current position and delegates the actual storage strategy to the internal RowSelectionBacking.

Variants

All

Reading all rows

Mask(MaskCursor)

Use a bitmask to back the selection (dense selections)

Selectors(SelectorsCursor)

Use a queue of selectors to back the selection (sparse selections)

Implementations

impl RowSelectionCursor

pub(crate) fn new_mask_from_selectors(selectors: Vec<RowSelector>) -> Self

Create a MaskCursor cursor backed by a bitmask, from an existing set of selectors

pub(crate) fn new_selectors(selectors: Vec<RowSelector>) -> Self

Create a RowSelectionCursor::Selectors from the provided selectors

pub(crate) fn new_all() -> Self

Create a cursor that selects all rows

Trait Implementations

impl Debug for RowSelectionCursor

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.