Struct ScanRequestFingerprint 

pub(crate) struct ScanRequestFingerprint {
    inner: Arc<SharedScanRequestFingerprint>,
    time_filters: Option<Arc<Vec<String>>>,
    series_row_selector: Option<TimeSeriesRowSelector>,
    append_mode: bool,
    filter_deleted: bool,
    merge_mode: MergeMode,
    sequence_range: Option<SequenceRange>,
    stage: RangeScanStage,
    partition_expr_version: u64,
}

Fingerprint of the scan request fields that affect partition range cache reuse.

It records a normalized view of the projected columns and filters, plus scan options that can change the returned rows. Schema-dependent metadata and the partition expression version are included so cached results are not reused across incompatible schema or partitioning changes.

Fields

inner: Arc<SharedScanRequestFingerprint>

Projection and filters without the time index and partition exprs.

time_filters: Option<Arc<Vec<String>>>

Filters with the time index column.

series_row_selector: Option<TimeSeriesRowSelector>

append_mode: bool

filter_deleted: bool

merge_mode: MergeMode

sequence_range: Option<SequenceRange>

Exact sequence range applied row-level on SST reads, or None for scans without row-level sequence filtering. Kept in the cache key so filtered range results are never reused for scans with a different (or no) range.

stage: RangeScanStage

partition_expr_version: u64

We keep the partition expr version to ensure we won’t reuse the fingerprint after we change the partition expr. We store the version instead of the whole partition expr or partition expr filters.

Implementations

impl ScanRequestFingerprint

pub(crate) fn without_time_filters(&self) -> Self

fn for_candidate_series(&self) -> Self

fn for_series_data(&self, range: SeriesRange) -> Self

pub(crate) fn estimated_size(&self) -> usize

Trait Implementations

impl Clone for ScanRequestFingerprint

fn clone(&self) -> ScanRequestFingerprint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ScanRequestFingerprint

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

Formats the value using the given formatter.

impl Hash for ScanRequestFingerprint

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ScanRequestFingerprint

fn eq(&self, other: &ScanRequestFingerprint) -> 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 Eq for ScanRequestFingerprint

impl StructuralPartialEq for ScanRequestFingerprint