Struct CowRewriteStats 

pub struct CowRewriteStats {
    pub candidate_files: usize,
    pub rewritten_files: usize,
    pub unchanged_files: usize,
    pub input_rows: u64,
    pub output_rows: u64,
    pub changed_batches: u64,
}

Counters produced by a copy-on-write rewrite.

Fields

candidate_files: usize

Number of candidate files selected by planning.

rewritten_files: usize

Number of old files that have replacement output or are fully removed.

unchanged_files: usize

Number of candidate files that did not change after row rewriting.

input_rows: u64

Visible input row count read from candidate files.

output_rows: u64

Output row count written to replacement files.

Rows the rewriter emitted for files that turned out unchanged are not counted, so this always matches the row counts of added_data_files.

changed_batches: u64

Number of input batches that changed, including batches the rewriter dropped entirely (output: None) even if it did not flag them.

Trait Implementations

impl Clone for CowRewriteStats

fn clone(&self) -> CowRewriteStats

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CowRewriteStats

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

Formats the value using the given formatter.

impl Default for CowRewriteStats

fn default() -> CowRewriteStats

Returns the “default value” for a type.

impl PartialEq for CowRewriteStats

fn eq(&self, other: &CowRewriteStats) -> 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 Copy for CowRewriteStats

impl Eq for CowRewriteStats

impl StructuralPartialEq for CowRewriteStats