Struct OrcFileMetrics 

pub struct OrcFileMetrics {
    pub bytes_scanned: Count,
    pub file_size: Count,
    pub io_requests: Count,
    pub metadata_load_time: Time,
    pub stripes_pruned_statistics: PruningMetrics,
    pub statistics_eval_time: Time,
    pub predicate_evaluation_errors: Count,
    pub pushdown_rows_pruned: Count,
    pub pushdown_rows_matched: Count,
    pub decode_time: Time,
    pub rows_decoded: Count,
    pub batches_produced: Count,
}

Metrics for ORC file operations.

Tracks performance statistics for reading ORC files, including I/O, metadata loading, stripe pruning, and predicate evaluation.

Fields

bytes_scanned: Count

Total number of bytes scanned from the file.

This includes all data read from the object store, including metadata, stripe data, and index data.

file_size: Count

Total file size in bytes (for calculating scan efficiency).

io_requests: Count

Number of I/O requests made to the object store.

metadata_load_time: Time

Time spent reading and parsing ORC file metadata (footer, postscript).

stripes_pruned_statistics: PruningMetrics

Number of stripes pruned or matched by statistics.

This uses PruningMetrics which tracks both pruned and matched counts.

• pruned: Stripes skipped due to statistics not matching the predicate
• matched: Stripes that were read because they might contain matching rows

statistics_eval_time: Time

Time spent evaluating stripe-level statistics for pruning.

predicate_evaluation_errors: Count

Number of times predicate evaluation encountered errors.

This can happen when statistics are malformed or when the predicate cannot be evaluated against the available metadata.

pushdown_rows_pruned: Count

Number of rows filtered out by predicates pushed into the ORC scan.

pushdown_rows_matched: Count

Number of rows that passed predicates pushed into the ORC scan.

decode_time: Time

Time spent decoding ORC data into Arrow arrays.

rows_decoded: Count

Total number of rows decoded from the file.

batches_produced: Count

Number of RecordBatches produced.

Implementations

impl OrcFileMetrics

pub fn new( partition: usize, filename: &str, metrics: &ExecutionPlanMetricsSet, ) -> Self

Create new ORC file metrics.

Arguments

• partition - The partition index for this scan
• filename - The name of the ORC file being scanned
• metrics - The metrics set to register metrics with

pub fn scan_efficiency(&self) -> Option<f64>

Calculate the scan efficiency ratio.

Returns the ratio of bytes scanned to total file size.

• 1.0 = entire file was read
• 0.5 = half the file was read (due to projection/filtering)
• 0.0 = no data read (all stripes pruned)

Returns None if file size is zero.

Trait Implementations

impl Clone for OrcFileMetrics

fn clone(&self) -> OrcFileMetrics

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OrcFileMetrics

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

Formats the value using the given formatter.