scalaspark数据对比_Scala，Spark中==和===之间的区别

I am from a Java background and new to Scala.

I am using Scala and Spark. But I&＃39;m not able to understand where I use &＃61;&＃61;and &＃61;&＃61;&＃61;.

Could anyone let me know in which scenario I need to use these two operators, and what&＃39;s are difference between &＃61;&＃61; and &＃61;&＃61;&＃61;?

解决方案

The "&＃61;&＃61;" is using the equals methods which checks if the two references point to the same object. The definition of "&＃61;&＃61;&＃61;" depends on the context/object. For Spark , "&＃61;&＃61;&＃61;" is using the equalTo method.

See

(Since you are referencing Spark:) An important difference for Spark is the return value. For Column:

&＃61;&＃61; returns a boolean

&＃61;&＃61;&＃61; returns a column (which contains the result of the comparisons of the elements of two columns)