Struct ListStructuralEncoder

pub struct ListStructuralEncoder { /* private fields */ }

A structural encoder for list fields

The list’s offsets are added to the rep/def builder and the list array’s values are passed to the child encoder

The values will have any garbage values removed and will be trimmed to only include the values that are actually used.

Implementations

impl ListStructuralEncoder

pub fn new(child: Box<dyn FieldEncoder>) -> Self

Trait Implementations

impl FieldEncoder for ListStructuralEncoder

fn maybe_encode( &mut self, array: ArrayRef, external_buffers: &mut OutOfLineBuffers, repdef: RepDefBuilder, row_number: u64, num_rows: u64, ) -> Result<Vec<EncodeTask>>

Buffer the data and, if there is enough data in the buffer to form a page, return an encoding task to encode the data.

fn flush( &mut self, external_buffers: &mut OutOfLineBuffers, ) -> Result<Vec<EncodeTask>>

Flush any remaining data from the buffers into encoding tasks

fn num_columns(&self) -> u32

The number of output columns this encoding will create

fn finish( &mut self, external_buffers: &mut OutOfLineBuffers, ) -> BoxFuture<'_, Result<Vec<EncodedColumn>>>

Finish encoding and return column metadata