Trait Rebuilder 

pub trait Rebuilder: Send + Sync {
    // Required methods
    fn hint_col(&self) -> Option<ColumnId>;
    fn rebuild_val(&self, val: Value) -> Value;
    fn rebuild_buf(
        &self,
        buf: &RowBuffer,
        start: RowId,
        end: RowId,
        out: &mut TaggedRowBuffer,
        exec_state: &mut ExecutionState<'_>,
    );
    fn rebuild_subset(
        &self,
        other: WrappedTableRef<'_>,
        subset: SubsetRef<'_>,
        out: &mut TaggedRowBuffer,
        exec_state: &mut ExecutionState<'_>,
    );
    fn rebuild_slice(&self, vals: &mut [Value]) -> bool;
}

Custom functions used for tables that encode a bulk value-level rebuild of other tables.

The initial use-case for this trait is to support optimized implementations of rebuilding, where Rebuilder is implemented as a Union-find.

Value-level rebuilds are difficult to implement efficiently using rules as they require searching for changes to any column for a table: while it is possible to do, implementing this custom is more efficient in the case of rebuilding.

Required Methods

fn hint_col(&self) -> Option<ColumnId>

The column that contains values that should be rebuilt. If this is set, callers can use this functionality to perform rebuilds incrementally.

fn rebuild_val(&self, val: Value) -> Value

fn rebuild_buf( &self, buf: &RowBuffer, start: RowId, end: RowId, out: &mut TaggedRowBuffer, exec_state: &mut ExecutionState<'_>, )

Rebuild a contiguous slice of rows in the table.

fn rebuild_subset( &self, other: WrappedTableRef<'_>, subset: SubsetRef<'_>, out: &mut TaggedRowBuffer, exec_state: &mut ExecutionState<'_>, )

Rebuild an arbitrary subset of the table.

fn rebuild_slice(&self, vals: &mut [Value]) -> bool

Rebuild a slice of values in place, returning true if any values were changed.

Implementors