Struct ApproximateRangeStats 

pub struct ApproximateRangeStats {
    pub bytes: u64,
    pub key_count: u64,
}

Approximate size of a key range, estimated from SST block-index offsets and the active memtable WITHOUT reading any data block. Returned by crate::AbstractTree::approximate_range_stats.

Both figures are estimates from the same in-range fraction per source: each overlapping SST’s data-block offsets are interpolated at the range boundaries (block granularity) and that fraction is applied to the SST’s byte span and its entry count, while each memtable contributes its in-range skiplist count and the matching share of its size. Accuracy is typically within ~10-15% on roughly-uniform data; it is intended for query planning (split-point selection, cost-based join ordering), not exact accounting.

Fields

bytes: u64

Estimated on-disk bytes occupied by the range across all overlapping SSTs (key + pointer + apportioned blob bytes) plus the active and sealed memtables’ in-range share. 0 for an empty range.

key_count: u64

Estimated number of entry versions in the range: the sum, over each overlapping SST, of item_count × in-range fraction, plus each memtable’s in-range skiplist count. 0 for an empty range.

Trait Implementations

impl Clone for ApproximateRangeStats

fn clone(&self) -> ApproximateRangeStats

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ApproximateRangeStats

impl Debug for ApproximateRangeStats

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

Formats the value using the given formatter.

impl Default for ApproximateRangeStats

fn default() -> ApproximateRangeStats

Returns the “default value” for a type.

impl Eq for ApproximateRangeStats

impl PartialEq for ApproximateRangeStats

fn eq(&self, other: &ApproximateRangeStats) -> 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 StructuralPartialEq for ApproximateRangeStats