我有一个中等大小的“functionCalls”表（约 4M 行），由 2 列组成，input并且function（另一个表的两个 id）：
Column | Type | Collation | Nullable | Default \n----------+---------+-----------+----------+---------\n input | integer | | not null | \n function | integer | | not null | \nIndexes:\n "functionCall_pkey" PRIMARY KEY, btree (input, function) CLUSTER\n "functionCallSearch" btree (function, input)\nForeign-key constraints:\n "fkey1" FOREIGN KEY (function) REFERENCES function(id) ON UPDATE CASCADE ON DELETE CASCADE\n "fkey2" FOREIGN KEY (input) REFERENCES input(id)\n\n我想找到与某个函数匹配的所有行，这就是我添加索引的原因functionCallSearch。这是我的查询：
Column | Type | Collation | …