Struct parquet::arrow::async_reader::MetadataLoader

pub struct MetadataLoader<F> { /* private fields */ }

An asynchronous interface to load ParquetMetaData from an async source

Implementations

impl<F: MetadataFetch> MetadataLoader<F>

pub async fn load( fetch: F, file_size: usize, prefetch: Option<usize> ) -> Result<Self>

Create a new MetadataLoader by reading the footer information

See fetch_parquet_metadata for the meaning of the individual parameters

pub fn new(fetch: F, metadata: ParquetMetaData) -> Self

Create a new MetadataLoader from an existing ParquetMetaData

pub async fn load_page_index( &mut self, column_index: bool, offset_index: bool ) -> Result<()>

Loads the page index, if any

• column_index: if true will load column index
• offset_index: if true will load offset index

pub fn finish(self) -> ParquetMetaData

Returns the finished ParquetMetaData