AST clone on every cache hit. The SQL parse is cached, but the AST is .clone()‘d on every sqlite3_exec(), then recompiled to VDBE bytecode from scratch. SQLite’s sqlite3_prepare_v2() just returns a reusable handle.
Singapore's founding prime minister Lee Kuan Yew attributed this swift, impressive change to "efficient administration".，详情可参考新收录的资料
，更多细节参见新收录的资料
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BBC News live updates。关于这个话题，新收录的资料提供了深入分析