Trait polars_lazy::logical_plan::AnonymousScan
source · [−]pub trait AnonymousScan: Send + Sync {
fn scan(&self, scan_opts: AnonymousScanOptions) -> Result<DataFrame>;
fn schema(&self, _infer_schema_length: Option<usize>) -> Result<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) -> Result<DataFrame>
fn scan(&self, scan_opts: AnonymousScanOptions) -> Result<DataFrame>
Creates a dataframe from the supplied function & scan options.
Provided Methods
function to supply the schema. Allows for an optional infer schema argument for data sources with dynamic schemas
fn allows_predicate_pushdown(&self) -> bool
fn allows_predicate_pushdown(&self) -> bool
specify if the scan provider should allow predicate pushdowns
Defaults to false
fn allows_projection_pushdown(&self) -> bool
fn allows_projection_pushdown(&self) -> bool
specify if the scan provider should allow projection pushdowns
Defaults to false
fn allows_slice_pushdown(&self) -> bool
fn allows_slice_pushdown(&self) -> bool
specify if the scan provider should allow slice pushdowns
Defaults to false