Module peek_scan 

An index peek’s walk over the two traces that answer it, as one suspendable object.

A PeekScan owns both cursors, the rows it has accumulated, and the accounting that bounds them, and it spends a single budget across both phases. It performs no IO and never awaits, so the same scan runs wherever its driver puts it, and a driver that stops it between two cursor positions picks it up again without repeating work.

Structs

PeekScan 🔒

An index peek’s walk over its error trace and its ok trace.

StashBounds 🔒

How a scan’s rows may leave for the peek stash.

WalkPhases 🔒

What a walk has spent, in the phases the peek metrics report.

Enums

ErrorPhase 🔒

The state of a PeekScan’s walk over its error trace.

ScanOutcome 🔒

The outcome of a fueled PeekScan::step.

Constants

COUNT_BYTE_SIZE 🔒

The byte size of a row’s count, as an answer built from a RowBatch stores it.

OFFSET_BYTE_SIZE 🔒

The byte size of a row’s offset into the answer’s packed row data.

Functions

entry_byte_len 🔒

The bytes one (row, count) entry contributes to the answer it ends up in.

rows_response 🔒

Builds the peek’s answer out of the rows a completed walk produced, sorted by order_by.

Type Aliases

IndexPeekScan 🔒

The scan an index peek builds, over the ok trace of the arrangement that answers it.

RowBatch 🔒

Rows a scan hands to its driver, in the order the scan produced them.