Method erase_cell

nodedb/src/engine/array/memtable/tile_buffer.rs:251–264

Append a GDPR erasure version for `(coord, system_from_ms)`. Writes the `0xFE` sentinel rather than the `0xFF` tombstone. The ceiling resolver returns `CeilingResult::Erased` for this coord at any `system_as_of >= system_from_ms`.

(
        &mut self,
        schema: &ArraySchema,
        coord: Vec<CoordValue>,
        system_from_ms: i64,
        lsn: u64,
    )

    /// resolver returns `CeilingResult::Erased` for this coord at any
    /// `system_as_of >= system_from_ms`.
    pub fn erase_cell(
        &mut self,
        schema: &ArraySchema,
        coord: Vec<CoordValue>,
        system_from_ms: i64,
        lsn: u64,
    ) -> ArrayResult<TileId> {
        let tile = tile_id_for_cell(schema, &coord, system_from_ms)?;
        self.tiles
            .entry(tile)
            .or_default()
            .push_erasure(&coord, lsn)?;
        Ok(tile)
    }

    pub fn stats(&self) -> MemtableStats {
        let mut s = MemtableStats::default();