rabosh-index/app.oreshkov.rabosh.index/ColumnScan

ColumnScan

class ColumnScan

What a column scan found, and what it cost.

The counters are the point. "A column scan touches no document" is a claim about work, not about results, and a result set alone cannot demonstrate it — so documentsRead is reported and the suite asserts it is zero in the same test as the differential equality against a full scan. On its own it would pass trivially for a query that returned nothing.

Properties

val blocksScanned: Int

Statistics blocks whose values were examined.

val blocksSkipped: Int

Statistics blocks ruled out by their bounds without reading a value.

val coverage: IndexCoverage

val documentsRead: Int

Documents opened to produce keys.

val keys: List<Key>

The matching keys, deduplicated and sorted.

segmentsSkipped

val segmentsSkipped: Int

Segments ruled out by their bounds without reading a block.

val usedColumn: Boolean

Whether the column answered at all, or the scan was a fallback.

Functions

open override fun toString(): String