Trait LayoutVTable

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

Required Methods

fn id(&self) -> LayoutId

Returns the globally unique ID for this type of layout.

fn reader( &self, layout: Layout, segment_source: &Arc<dyn SegmentSource>, ctx: &ArrayContext, ) -> 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.

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 DictLayout

impl LayoutVTable for FlatLayout

impl LayoutVTable for StatsLayout

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

impl LayoutVTable for StructLayout