Caller is responsible for managing the memory context, the default is CurrentMemoryContext */

intensionally implicit */

`<~>` returns -dot, matching pgvector-style "lower = more similar" so that ORDER BY a <~> b ASC sorts most-similar first. Alias of the negative-inner-

Zero pq so prepare()'s `pq.M == 0` cache-miss path fires for fresh instances. ProductQuantizer is a plain struct with size_t / float* / function-point

* PageIndexTupleDeleteStable * * Remove one tuple from an index-like page while keeping all remaining * line-pointer offset numbers sta

Huge-allowed allocation. Lets the shared PQ codebook exceed PG's default 1GB AllocSet limit (e.g. d=1024, M=64, ksub=256). Falls through pfree on rele