Struct IoSnapshot 

pub struct IoSnapshot {

    pub edge_full_reads: u64,
    pub edge_full_rows: u64,
    pub edge_filtered_reads: u64,
    pub edge_filtered_rows: u64,
    pub node_full_reads: u64,
    pub node_full_rows: u64,
    pub node_filtered_reads: u64,
    pub node_filtered_rows: u64,
    pub edge_scanned_rows: u64,
    pub node_scanned_rows: u64,
    pub node_dense_row_selection_reads: u64,
    pub node_row_group_predicate_reads: u64,
    pub node_row_groups_considered: u64,
    pub node_row_groups_selected: u64,
    pub node_pages_considered: u64,
    pub node_pages_selected: u64,
    pub node_exact_rows_selected: u64,
    pub node_metadata_fallbacks: u64,
    pub node_validation_fallbacks: u64,
    pub rewrite_commits: u64,
}

A point-in-time copy of the process-global I/O counters. Difference two snapshots — or reset then snapshot — to attribute work to a region.

Fields

edge_full_reads: u64

Full edge-file reads: read_edges plus the filtered-read fallback.

edge_full_rows: u64

Rows returned by those full edge reads.

edge_filtered_reads: u64

edge_id-filtered edge reads that took the predicate-pushdown path.

edge_filtered_rows: u64

Rows materialized by those filtered reads (post-pruning).

node_full_reads: u64

Full node-file reads: read_nodes plus the filtered-read fallback.

node_full_rows: u64

Rows returned by those full node reads.

node_filtered_reads: u64

node_id-filtered node reads that took the predicate-pushdown path (read_nodes_filtered, #838).

node_filtered_rows: u64

Rows materialized by those filtered node reads (post-pruning).

edge_scanned_rows: u64

Edge rows the pushdown predicate actually evaluated — i.e. rows in the data pages the page index did not skip. The decode-cost proxy: for a clustered (localized) id set this is a few pages regardless of total file size; for a scattered set it approaches the whole file. (#838)

node_scanned_rows: u64

Node rows the pushdown predicate evaluated (pages not page-index-skipped).

node_dense_row_selection_reads: u64

Node reads that used exact dense row selection.

node_row_group_predicate_reads: u64

Node reads that used conservative row-group and predicate pruning.

node_row_groups_considered: u64

Node row groups whose metadata was considered for pruning.

node_row_groups_selected: u64

Node row groups retained for decoding.

node_pages_considered: u64

Node-id pages considered by exact dense selection.

node_pages_selected: u64

Node-id pages containing selected rows.

node_exact_rows_selected: u64

Exact node row ordinals selected before the membership guard.

node_metadata_fallbacks: u64

Dense selection attempts rejected by the metadata contract.

node_validation_fallbacks: u64

Dense selection attempts rejected by post-read validation.

rewrite_commits: u64

Successful non-empty RewriteBatch commits. This counts persistence cycles, not the number of files in a batch.

Trait Implementations

impl Clone for IoSnapshot

fn clone(&self) -> IoSnapshot

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for IoSnapshot

impl Debug for IoSnapshot

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

Formats the value using the given formatter.

impl Default for IoSnapshot

fn default() -> IoSnapshot

Returns the “default value” for a type.

impl Eq for IoSnapshot

impl PartialEq for IoSnapshot

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for IoSnapshot