Struct MmapDatasetBuilder 

pub struct MmapDatasetBuilder { /* private fields */ }

Builder for configuring MmapDataset options.

Implementations

impl MmapDatasetBuilder

pub fn new() -> Self

Creates a new builder with default options.

pub fn batch_size(self, size: usize) -> Self

Sets the batch size for reading.

pub fn columns(self, cols: Vec<String>) -> Self

Sets the columns to read (projection pushdown).

pub fn open(self, path: impl AsRef<Path>) -> Result<MmapDataset>

Opens the Parquet file with the configured options.

Errors

Returns an error if the file cannot be opened or parsed.

Trait Implementations

impl Debug for MmapDatasetBuilder

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

Formats the value using the given formatter.

impl Default for MmapDatasetBuilder

fn default() -> MmapDatasetBuilder

Returns the “default value” for a type.