cache DataFrame

[Gaurav Agarwal]

Hi

When the dataFrame will load the table into memory when it reads from
HIVe/Phoenix or from any database.
These are two points where need one info , when tables will be loaded into
memory or cached when at  point 1 or point 2 below.

 1. DataFrame df = sContext.load("jdbc","(select * from employee) as
employee);

2.sContext.sql("select * from employee where wmpid="!");