【hive报错】SemanticException Failed to breakup Windowing invocations into Groups

背景：在hive取数中，偶然报了这个神奇的错误信息，且系统不能定位到具体地方

报错如下：

SemanticException Failed to breakup Windowing invocations into Groups. At least 1 group must only depend on input columns. Also check for circular dependencies

SemanticException Failed to breakup Windowing invocations into Groups. At least 1 group must only depend on input columns. Also check for circular dependencies

原因：在sql语句中使用了求和开窗函数 sum() over()
且作为分母使用在数值计算中。如：a.num/ sum() over(xxx);
因为分母没有用括号括起来，使得系统产生错误

找到原因后，解决就简单了
在数值计算中，将求和开窗函数括起来
即：a.num/ (sum() over(xxx))
OK，完事～