Struct mz_repr::row::collection::SortedRowCollectionIter

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pub struct SortedRowCollectionIter {
    collection: SortedRowCollection,
    row_idx: usize,
    diff_idx: usize,
    limit: Option<usize>,
    offset: usize,
    projection: Option<Vec<usize>>,
    projection_buf: (DatumVec, Row),
}

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§collection: SortedRowCollection

Collection we’re iterating over.

§row_idx: usize

Index for the row we’re currently referencing.

§diff_idx: usize

Number of diffs we’ve emitted for the current row.

§limit: Option<usize>

Maximum number of rows this iterator will yield.

§offset: usize

Number of rows we’re offset by.

Note: We eagerly apply an offset, but we track it here so we can accurately report RowIterator::count.

§projection: Option<Vec<usize>>

Columns to underlying rows to include.

§projection_buf: (DatumVec, Row)

Allocations that we reuse for every iteration to project columns.

Implementations§

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impl SortedRowCollectionIter

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pub fn into_inner(self) -> SortedRowCollection

Returns the inner SortedRowCollection.

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pub fn apply_offset(self, offset: usize) -> SortedRowCollectionIter

Immediately applies an offset to this iterator.

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pub fn with_limit(self, limit: usize) -> SortedRowCollectionIter

Sets the limit for this iterator.

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pub fn with_projection(self, projection: Vec<usize>) -> SortedRowCollectionIter

Specify the columns that should be yielded.

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fn advance_by( collection: &SortedRowCollection, row_idx: &mut usize, diff_idx: &mut usize, count: usize, )

Helper method for implementing RowIterator.

Advances the internal pointers by the specified amount.

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fn project<'a>( projection: Option<&'a Vec<usize>>, row: &'a RowRef, datum_buf: &'a mut DatumVec, row_buf: &'a mut Row, ) -> Option<&'a RowRef>

Helper method for implementing RowIterator.

Projects columns for the provided row.

Trait Implementations§

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impl Clone for SortedRowCollectionIter

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fn clone(&self) -> SortedRowCollectionIter

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for SortedRowCollectionIter

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

Formats the value using the given formatter. Read more
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impl RowIterator for SortedRowCollectionIter

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fn next(&mut self) -> Option<&RowRef>

Returns the next RowRef advancing the iterator.
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fn peek(&mut self) -> Option<&RowRef>

Returns the next RowRef without advancing the iterator.
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fn count(&self) -> usize

The total number of Rows this iterator could ever yield. Read more
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fn map<T, F>(self, f: F) -> MappedRowIterator<Self, F>
where Self: Sized, F: FnMut(&RowRef) -> T,

Maps the returned RowRefs from this RowIterator.

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