1·To reduce execution time, unless the rules are columnar, you should use virtual tables where possible, and avoid using sampling.
要减少执行时间，除非规则是柱状的，否则，在可能的情况下采用虚拟表，并避免使用抽样。
2·The columnar tests and functions that can impact performance on the execution of the rule are highlighted in bold.
会在规则执行中影响性能的柱状测试及函数已通过加粗来突出显示。
3·You can also see which of them are scalar and columnar.
还可查看这其中哪些是标量，哪些是柱状。
4·The pure glacial waters of Oregon's Proxy Falls flows over the moss covered columnar basalt.
俄勒冈州的飞流瀑布的纯净冰水流过苔藓覆盖着的柱状玄武岩。
5·Rules that require several passes over the data are called columnar rules.
需要传递多个数据的规则称为柱状规则。