Enum ColumnFetch 

pub(crate) enum ColumnFetch<'a> {
    Chunk {
        range: Range<u64>,
    },
    Pages {
        dictionary: Option<Range<u64>>,
        locations: &'a [PageLocation],
        pages: Vec<usize>,
    },
}

What InMemoryRowGroup::fetch_ranges fetches for one column chunk.

This is the one place that decides which bytes of a column chunk are requested, so other users of this rule cannot differ from the decoder.

Variants

Chunk

The whole column chunk, as one range. This is the case if there is no selection or the column has no offset index.

Fields

range: Range<u64>

Byte range of the column chunk.

Pages

The dictionary page, if any, and the data pages that contain a selected row.

Fields

dictionary: Option<Range<u64>>

Byte range of the dictionary page, if the column chunk has one.

locations: &'a [PageLocation]

The page locations of the column chunk.

pages: Vec<usize>

Indexes in locations of the data pages to fetch, in page order.

Implementations

impl<'a> ColumnFetch<'a>

pub(crate) fn new( chunk: Range<u64>, locations: Option<&'a [PageLocation]>, selection: Option<&RowSelection>, ) -> Self

The fetch of the column chunk at byte range chunk, with page locations locations from its offset index, if any, and row selection selection, if any.

pub(crate) fn ranges(&self) -> impl Iterator<Item = Range<u64>> + '_

The byte ranges to fetch, in file order.

Trait Implementations

impl<'a> Clone for ColumnFetch<'a>

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for ColumnFetch<'a>

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

Formats the value using the given formatter.

impl<'a> Eq for ColumnFetch<'a>

impl<'a> PartialEq for ColumnFetch<'a>

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

Equality operator ==.

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

Inequality operator !=.

impl<'a> StructuralPartialEq for ColumnFetch<'a>