Enum TableProviderFilterPushDown 

pub enum TableProviderFilterPushDown {
    Unsupported,
    Inexact,
    Exact,
}

Indicates how a filter expression is handled by TableProvider::scan.

Filter expressions are boolean expressions used to reduce the number of rows that are read from a table. Only rows that evaluate to true (“pass the filter”) are returned. Rows that evaluate to false or NULL are omitted.

Variants

Unsupported

The filter cannot be used by the provider and will not be pushed down.

Inexact

The filter can be used, but the provider might still return some tuples that do not pass the filter.

In this case, DataFusion applies an additional Filter operation after the scan to ensure all rows are filtered correctly.

Exact

The provider guarantees that it will omit only tuples which pass the filter.

In this case, DataFusion will not apply additional filtering.

Trait Implementations

impl Clone for TableProviderFilterPushDown

fn clone(&self) -> TableProviderFilterPushDown

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TableProviderFilterPushDown

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

Formats the value using the given formatter.

impl PartialEq for TableProviderFilterPushDown

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

impl StructuralPartialEq for TableProviderFilterPushDown