Trait RowGroups 

pub trait RowGroups {
    // Required methods
    fn num_rows(&self) -> usize;
    fn column_chunks(&self, i: usize) -> Result<Box<dyn PageIterator>>;
    fn row_groups(&self) -> Box<dyn Iterator<Item = &RowGroupMetaData> + '_>;
    fn metadata(&self) -> &ParquetMetaData;
}

Interface for reading data pages from the columns of one or more RowGroups.

Required Methods

fn num_rows(&self) -> usize

Get the number of rows in this collection

fn column_chunks(&self, i: usize) -> Result<Box<dyn PageIterator>>

Returns a PageIterator for all pages in the specified column chunk across all row groups in this collection.

fn row_groups(&self) -> Box<dyn Iterator<Item = &RowGroupMetaData> + '_>

Returns an iterator over the row groups in this collection

Note this may not include all row groups in Self::metadata.

fn metadata(&self) -> &ParquetMetaData

Returns the parquet metadata

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl RowGroups for Arc<dyn FileReader>

fn num_rows(&self) -> usize

fn column_chunks(&self, column_index: usize) -> Result<Box<dyn PageIterator>>

fn row_groups(&self) -> Box<dyn Iterator<Item = &RowGroupMetaData> + '_>

fn metadata(&self) -> &ParquetMetaData

Implementors

impl RowGroups for InMemoryRowGroup<'_>

impl<T: ChunkReader + 'static> RowGroups for ReaderRowGroups<T>