[−][src]Trait parquet::file::reader::FileReader
Parquet file reader API. With this, user can get metadata information about the Parquet file, can get reader for each row group, and access record iterator.
Required methods
fn metadata(&self) -> &ParquetMetaData
Get metadata information about this file.
fn num_row_groups(&self) -> usize
Get the total number of row groups for this file.
fn get_row_group(&self, i: usize) -> Result<Box<dyn RowGroupReader>>
Get the i
th row group reader. Note this doesn't do bound check.
fn get_row_iter(&self, projection: Option<SchemaType>) -> Result<RowIter>
Get full iterator of Row
s from a file (over all row groups).
Iterator will automatically load the next row group to advance.
Projected schema can be a subset of or equal to the file schema, when it is None, full file schema is assumed.