Chris

How does Apache Pig handle nulls

It is important to understand that in Pig the concept of null is the same as in SQL, which is completely different from the concept of null in C, Java, Python, etc. In Pig a null data element means the value is unknown.

I Expression

Find ubuntu environment variables

We know that echo $PATH will print all of the environment variables. There are several places we can put the path variables in.

/home/<username>/.profile

Spring Beans scope: Singleton and Prototype

Singleton

By default, the bean is in singleton pattern. That is, in the spring application context, there will be only instance.

Prototype