Struct ParquetReadOptions 

pub struct ParquetReadOptions {
    pub columns: Option<Vec<String>>,
    pub row_groups: Option<Vec<usize>>,
    pub batch_size: usize,
    pub predicate: Option<Expr>,
}

I/O option types. Options for reading Parquet files.

Fields

columns: Option<Vec<String>>

Optional column projection (names).

row_groups: Option<Vec<usize>>

Optional row group selection.

batch_size: usize

Record batch size for the Parquet reader.

predicate: Option<Expr>

Optional predicate expression to apply (may be pushed down in the future).

Implementations

impl ParquetReadOptions

pub fn with_columns<I, S>(self, columns: I) -> Self

where I: IntoIterator<Item = S>, S: Into<String>,

Set a column projection by name.

pub fn with_row_groups<I>(self, row_groups: I) -> Self

where I: IntoIterator<Item = usize>,

Set row group indices to read.

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

Set record batch size.

pub fn with_predicate(self, predicate: Expr) -> Self

Set a predicate to apply.

Trait Implementations

impl Clone for ParquetReadOptions

fn clone(&self) -> ParquetReadOptions

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ParquetReadOptions

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

Formats the value using the given formatter.

impl Default for ParquetReadOptions

fn default() -> Self

Returns the “default value” for a type.