Trait LayoutVTable

pub trait LayoutVTable:
    Debug
    + Send
    + Sync {
    // Required methods
    fn id(&self) -> LayoutId;
    fn reader(
        &self,
        layout: Layout,
        ctx: ArrayContext,
        segment_reader: Arc<dyn AsyncSegmentReader>,
    ) -> VortexResult<Arc<dyn LayoutReader>>;
    fn register_splits(
        &self,
        layout: &Layout,
        field_mask: &[FieldMask],
        row_offset: u64,
        splits: &mut BTreeSet<u64>,
    ) -> VortexResult<()>;
    fn required_segments(
        &self,
        layout: &Layout,
        row_offset: u64,
        filter_field_mask: &[FieldMask],
        projection_field_mask: &[FieldMask],
        segments: &mut SegmentCollector,
    ) -> VortexResult<()>;
}

Required Methods

fn id(&self) -> LayoutId

Returns the globally unique ID for this type of layout.

fn reader( &self, layout: Layout, ctx: ArrayContext, segment_reader: Arc<dyn AsyncSegmentReader>, ) -> VortexResult<Arc<dyn LayoutReader>>

Construct a LayoutReader for the provided Layout.

May panic if the provided Layout is not the same encoding as this LayoutEncoding.

fn register_splits( &self, layout: &Layout, field_mask: &[FieldMask], row_offset: u64, splits: &mut BTreeSet<u64>, ) -> VortexResult<()>

Register the row splits for this layout, these represent natural boundaries at which a reader can split the layout for independent processing.

For example, a ChunkedLayout would register a boundary at the end of every chunk.

The layout is passed a row_offset that identifies the starting row of the layout within the file.

fn required_segments( &self, layout: &Layout, row_offset: u64, filter_field_mask: &[FieldMask], projection_field_mask: &[FieldMask], segments: &mut SegmentCollector, ) -> VortexResult<()>

Trait Implementations

impl Display for dyn LayoutVTable + '_

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for dyn LayoutVTable + '_

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for dyn LayoutVTable + '_

Implementors

impl LayoutVTable for ChunkedLayout

In-memory representation of Chunked layout.

impl LayoutVTable for FlatLayout

impl LayoutVTable for StatsLayout

First child contains the data, second child contains the statistics table.

impl LayoutVTable for StructLayout