Can someone please share the real time use cases of Series Data functions

Hi,

I understand the concept of series data in sap hana and I'm aware of various series data functions provided by sap hana.

Can someone please explain the exact use case of these functions. For Eg:

1. SERIES GENERATE function is used to generate complete series using the series data definition or provided values. But what can we possibly do with this output. I mean

          a) Can I load my series table with this output of the function?

          b) I can use this generated series as master series as join with the series in the original table for missing values. But I want to know the real    

              purpose of these function?

2. LINEAR_APPROX

3. SERIES_DISAGGREGATE

4. SERIES_ELEMENT_TO_PERIOD

5. SERIES_GENERATE

6. SERIES_PERIOD_TO_ELEMENT

7. SERIES_ROUND