Method ceiling_for_coord

nodedb/src/engine/array/store/catalog.rs:373–400

Resolve the ceiling for a specific cell coordinate. Returns the raw `CeilingResult` so callers can distinguish between `Live`, `Tombstoned`, `Erased`, and `NotFound` — unlike `scan_tiles_at` which collapses Tombstoned/Erased/NotFound into "no row in output tile". Useful for testing and diagnostic code that needs the exact sentinel type.

(
        &self,
        coord: &[CoordValue],
        system_as_of: i64,
        valid_at_ms: Option<i64>,
    )

    ///
    /// Useful for testing and diagnostic code that needs the exact sentinel type.
    pub fn ceiling_for_coord(
        &self,
        coord: &[CoordValue],
        system_as_of: i64,
        valid_at_ms: Option<i64>,
    ) -> nodedb_array::ArrayResult<nodedb_array::query::ceiling::CeilingResult> {
        use nodedb_array::query::ceiling::CeilingParams;
        // Find the hilbert_prefix for this coord.
        let hilbert_prefix = {
            use nodedb_array::tile::tile_id_for_cell;
            let tile = tile_id_for_cell(&self.schema, coord, 0).map_err(|e| {
                nodedb_array::ArrayError::SegmentCorruption {
                    detail: format!("ceiling_for_coord: tile id: {e}"),
                }
            })?;
            tile.hilbert_prefix
        };
        let versions = self.cell_versions_for_coord(hilbert_prefix, coord, system_as_of)?;
        let params = CeilingParams {
            system_as_of,
            valid_at_ms,
        };
        ceiling_resolve_cell(
            versions.iter().map(|(tid, b)| (*tid, b.as_slice())),
            coord,
            &params,
        )
    }

    /// Build a `(TileId, raw_bytes)` list for a specific `coord` across all
    /// versions (memtable + segments), ordered newest-first by `system_from_ms`.