Trait polars_plan::logical_plan::AnonymousScan

pub trait AnonymousScan: Send + Sync {
    fn scan(&self, scan_opts: AnonymousScanOptions) -> PolarsResult<DataFrame>;

    fn schema(&self, _infer_schema_length: Option<usize>) -> PolarsResult<Schema> { ... }
    fn allows_predicate_pushdown(&self) -> bool { ... }
    fn allows_projection_pushdown(&self) -> bool { ... }
    fn allows_slice_pushdown(&self) -> bool { ... }
}

Required Methods

fn scan(&self, scan_opts: AnonymousScanOptions) -> PolarsResult<DataFrame>

Creates a dataframe from the supplied function & scan options.

Provided Methods

fn schema(&self, _infer_schema_length: Option<usize>) -> PolarsResult<Schema>

function to supply the schema. Allows for an optional infer schema argument for data sources with dynamic schemas

fn allows_predicate_pushdown(&self) -> bool

specify if the scan provider should allow predicate pushdowns

Defaults to false

fn allows_projection_pushdown(&self) -> bool

specify if the scan provider should allow projection pushdowns

Defaults to false

fn allows_slice_pushdown(&self) -> bool

specify if the scan provider should allow slice pushdowns

Defaults to false

Trait Implementations

impl Debug for dyn AnonymousScan

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

Formats the value using the given formatter.

Implementors

impl<F> AnonymousScan for Fwhere
    F: Fn(AnonymousScanOptions) -> PolarsResult<DataFrame> + Send + Sync,