naive algorithm that joins two relations by using two nested loops
嵌套循环连接（Nested loop join）是通过嵌套的循环语句把多个表连接起来的简单算法，SQL中的连接操作是数据库管理中重要的一环，
Abstract from DBpedia / Wikipedia · CC BY-SA
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).