Enum ReqCols 

pub enum ReqCols {
    All,
    Names(BTreeSet<Box<str>>),
}

What columns this query needs synced for a base table. All ⇒ a '*' frame (no select) referenced the table, so it must sync every column; Names ⇒ the explicit set of column names the query structurally reads for the table (its required_cols at the name level — select ∪ where-leaf ∪ order_by ∪ start ∪ correlation fields). Unioned across every frame that references the same table (any All wins).

Variants

All

Names(BTreeSet<Box<str>>)

Trait Implementations

impl Clone for ReqCols

fn clone(&self) -> ReqCols

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ReqCols

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

Formats the value using the given formatter.

impl PartialEq for ReqCols

fn eq(&self, other: &ReqCols) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for ReqCols

impl StructuralPartialEq for ReqCols