With approximate indexes, queries with filtering can return less results (due to post-filtering). Starting with 0.8.0, you can enable iterative index scans. If too few results from the initial scan match the filters, the scan will resume until enough results are found (or it reaches`hnsw.max_scan_tuples` or`ivfflat.max_probes`).

There are two modes for iterative scans:strictand relaxed.

Iterative scans can usestrictor relaxed ordering.

Strict ensures results are in the exact order by distance