Now, the ST_LineString constructor is a deterministicfunction without any side effects.
现在，ST_LineString构造函数是一个没有任何副作用的确定性的函数。
2
Deterministicfunction calls can be extracted from the WHERE clause to avoid unnecessary table scan.
可以从WHERE子句中提取确定性函数调用，避免不必要的表扫描。
3
This paper advances that the unknow error in deterministicfunction and the random error which don't cause randomly fluctuation of measuring data can deal with uncertainty of B class.