Function arrow2::io::parquet::read::read_columns_async

pub async fn read_columns_async<'a, 'b, R: AsyncRead + AsyncSeek + Send + Unpin, F: Fn() -> BoxFuture<'b, Result<R>> + Clone>(
    factory: F,
    columns: &'a [ColumnChunkMetaData],
    field_name: &str
) -> Result<Vec<(&'a ColumnChunkMetaData, Vec<u8>)>>

Available on crate feature io_parquet only.

Reads all columns that are part of the parquet field field_name

Implementation

This operation is IO-bounded O(C) where C is the number of columns associated to the field (one for non-nested types)

It does so asynchronously via a single join_all over all the necessary columns for field_name.