20.5 Conclusion 结论 20.5 Conclusion 结论 The most important overall lesson from this chapter is that clean design and high performance are compatible. The Buffer class rewrite imp...
SQL by pass SQL by pass 在典型的OLTP场景中,简单查询占了很大一部分比例。这种查询的特征是只涉及单表和简单表达式的查询,因此为了加速这类查询,提出了SQL-BY-PASS框架,在parse层对这类查询做简单的模式判别后,进入到特殊的执行路径里,跳过经典的执行器执行框架,包括算子的初始化与执行、表达式与投影等经典框架,直接重写...