Struct parquet::arrow::array_reader::ListArrayReader

pub struct ListArrayReader<OffsetSize: OffsetSizeTrait> { /* fields omitted */ }

Implementation of list array reader.

Implementations

impl<OffsetSize: OffsetSizeTrait> ListArrayReader<OffsetSize>

pub fn new(
    item_reader: Box<dyn ArrayReader>,
    data_type: ArrowType,
    item_type: ArrowType,
    def_level: i16,
    rep_level: i16,
    list_null_def_level: i16,
    list_empty_def_level: i16
) -> Self

Construct list array reader.

Trait Implementations

impl<OffsetSize: OffsetSizeTrait> ArrayReader for ListArrayReader<OffsetSize>

Implementation of ListArrayReader. Nested lists and lists of structs are not yet supported.

fn get_data_type(&self) -> &ArrowType

Returns data type. This must be a List.

fn as_any(&self) -> &dyn Any

fn next_batch(&mut self, batch_size: usize) -> Result<ArrayRef>

Reads at most batch_size records into an arrow array and return it.

fn get_def_levels(&self) -> Option<&[i16]>

Returns the definition levels of data from last call of next_batch. The result is used by parent array reader to calculate its own definition levels and repetition levels, so that its parent can calculate null bitmap.

fn get_rep_levels(&self) -> Option<&[i16]>

Return the repetition levels of data from last call of next_batch. The result is used by parent array reader to calculate its own definition levels and repetition levels, so that its parent can calculate null bitmap.