polars_io::ipc

Struct IpcReader

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pub struct IpcReader<R: MmapBytesReader> { /* private fields */ }
Available on crate feature ipc and (crate features ipc or ipc_streaming) only.
Expand description

Read Arrows IPC format into a DataFrame

§Example

use polars_core::prelude::*;
use std::fs::File;
use polars_io::ipc::IpcReader;
use polars_io::SerReader;

fn example() -> PolarsResult<DataFrame> {
    let file = File::open("file.ipc").expect("file not found");

    IpcReader::new(file)
        .finish()
}

Implementations§

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impl<R: MmapBytesReader> IpcReader<R>

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pub fn schema(&mut self) -> PolarsResult<ArrowSchemaRef>

Get arrow schema of the Ipc File.

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pub fn with_n_rows(self, num_rows: Option<usize>) -> Self

Stop reading when n rows are read.

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

Columns to select/ project

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pub fn with_hive_partition_columns(self, columns: Option<Vec<Series>>) -> Self

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pub fn with_include_file_path( self, include_file_path: Option<(PlSmallStr, Arc<str>)>, ) -> Self

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pub fn with_row_index(self, row_index: Option<RowIndex>) -> Self

Add a row index column.

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pub fn with_projection(self, projection: Option<Vec<usize>>) -> Self

Set the reader’s column projection. This counts from 0, meaning that vec![0, 4] would select the 1st and 5th column.

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pub fn memory_mapped(self, path_buf: Option<PathBuf>) -> Self

Set if the file is to be memory_mapped. Only works with uncompressed files. The file name must be passed to register the memory mapped file.

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pub fn finish_with_scan_ops( self, predicate: Option<Arc<dyn PhysicalIoExpr>>, verbose: bool, ) -> PolarsResult<DataFrame>

Available on crate feature lazy only.

Trait Implementations§

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impl<R: MmapBytesReader> SerReader<R> for IpcReader<R>

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fn new(reader: R) -> Self

Create a new instance of the SerReader
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fn set_rechunk(self, rechunk: bool) -> Self

Make sure that all columns are contiguous in memory by aggregating the chunks into a single array.
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fn finish(self) -> PolarsResult<DataFrame>

Take the SerReader and return a parsed DataFrame.

Auto Trait Implementations§

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impl<R> Freeze for IpcReader<R>
where R: Freeze,

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impl<R> !RefUnwindSafe for IpcReader<R>

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impl<R> Send for IpcReader<R>

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impl<R> Sync for IpcReader<R>

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impl<R> Unpin for IpcReader<R>
where R: Unpin,

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impl<R> !UnwindSafe for IpcReader<R>

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impl<T> Any for T
where T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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where T: ?Sized,

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