Commit b029395

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Refactor nbtree fastpath optimization.

Commit 2b27273, which added the fastpath rightmost leaf page cache insert optimization, added code to _bt_doinsert() to handle using and invalidating the backend local block cache. It doesn't seem like a good place to handle these low level details, though. _bt_doinsert() is supposed to be a high level function -- it is the main entry point to nbtinsert.c. Restructure the code by placing handling of the rightmost block cache at the start of a new _bt_search() shim function, _bt_search_insert(). The new function is called from _bt_doinsert(), which uses it as a _bt_search() variant that conveniently accepts its BTInsertState state as an argument. _bt_doinsert() no longer needs to directly consider the fastpath optimization. Discussion: https://postgr.es/m/CAH2-Wzk59cxKJRd=rfbyub6-V4yWRjsOYRkUNHBLT1P1GdtCQQ@mail.gmail.com

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src/backend/access/nbtree
- nbtinsert.c

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