It feels like a basic problem that Postgres should solve. After all, can’t we just create an index? Yet in many production Postgres deployments, Top K is deceptively hard. This post examines where Postgres’ Top K optimizations shine, where they falter, and why search libraries like Lucene/Tantivy or databases like ParadeDB that specialize in Top K take a fundamentally different approach.
New Moon - The Moon is between Earth and the sun, so the side we see is dark (in other words, it's invisible to the eye).
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Simpler scalability path for high-concurrency shards.