Struct ScanRequest

pub struct ScanRequest {
    pub projection: Option<Vec<usize>>,
    pub filters: Vec<Expr>,
    pub output_ordering: Option<Vec<OrderOption>>,
    pub limit: Option<usize>,
    pub series_row_selector: Option<TimeSeriesRowSelector>,
}

Fields

projection: Option<Vec<usize>>

Indices of columns to read, None to read all columns. This indices is based on table schema.

filters: Vec<Expr>

Filters pushed down

output_ordering: Option<Vec<OrderOption>>

Expected output ordering. This is only a hint and isn’t guaranteed.

limit: Option<usize>

limit can be used to reduce the amount scanned from the datasource as a performance optimization. If set, it contains the amount of rows needed by the caller, The data source should return at least this number of rows if available.

series_row_selector: Option<TimeSeriesRowSelector>

Optional hint to select rows from time-series.

Trait Implementations

impl Clone for ScanRequest

fn clone(&self) -> ScanRequest

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ScanRequest

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

Formats the value using the given formatter.

impl Default for ScanRequest

fn default() -> ScanRequest

Returns the “default value” for a type.

impl PartialEq for ScanRequest

fn eq(&self, other: &ScanRequest) -> 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 ScanRequest

impl StructuralPartialEq for ScanRequest